【新文速递】2025年3月25日复合材料SCI期刊最新文章

 

今日更新：Composite Structures 7 篇，Composites Part A: Applied Science and Manufacturing 5 篇，Composites Part B: Engineering 12 篇

Composite Structures

Machine learning-based capacity model for CFST columns with damaged BFRP jackets

Yirui Zhang, Chi Ren, Lingfei Qian, Yang Wei, Jie Liu, Guofen Li

doi:10.1016/j.compstruct.2025.119120

基于机器学习的BFRP护套损坏CFST柱承载力模型

The use of concrete-filled steel tubular (CFST) columns reinforced with basalt fiber-reinforced polymer (BFRP) jackets is increasingly prevalent in construction engineering. However, BFRP jackets are prone to physical damage during joint design or maintenance, which can weaken their confinement effect on CFST columns. Consequently, the damage parameters of BFRP jackets are crucial for the reinforcement of CFST structures. In this study, past experimental data were validated using a finite element model (FEM). Building on this reliable FEM, a comprehensive database was created, consisting of 495 data points, encompassing various damage conditions such as direction, location, angle, and quantity. A method for normalizing different damage parameters was proposed to quantitatively describe their respective damage characteristics. With the exception of the circumferential slotting damage type, all other damage types resulted in a degradation of the strengthened stiffness. Six machine learning methods were then employed to establish the capacity model, where Random Forest (RF) and CatBoost significantly outperform linear models, with R2 values exceeding 0.97. SHAP analysis reveals that the scale of vertical grooves and the regional damage coefficient are key factors influencing the prediction. The research can provide a theoretical basis for the design and maintenance of BFRP-CFST columns.

玄武岩纤维增强聚合物（BFRP）护套加固钢管混凝土（CFST）柱在建筑工程中的应用越来越普遍。然而，在节点设计或维护过程中，BFRP夹套容易发生物理损伤，从而削弱了BFRP夹套对钢管混凝土柱的约束作用。因此，BFRP夹套的损伤参数对钢管混凝土结构的加固至关重要。在本研究中，使用有限元模型（FEM）验证了过去的实验数据。在此基础上，建立了一个由495个数据点组成的综合数据库，包括各种损伤情况，如方向、位置、角度和数量。提出了一种对不同损伤参数进行归一化的方法，定量描述不同损伤参数的损伤特征。除了周向开槽损伤类型外，其他所有类型的损伤都会导致强化刚度的退化。然后采用6种机器学习方法建立容量模型，其中Random Forest （RF）和CatBoost显著优于线性模型，R2值超过0.97。SHAP分析表明，垂直沟槽的规模和区域损伤系数是影响预测的关键因素。研究结果可为BFRP-CFST柱的设计和维护提供理论依据。

An analytical approach to predicting tensile pseudo-ductility and multi-stage failure process of multidirectional thin-ply CFRP laminates

Chenlong Ruan, Bowen Gong, Huan Wang, Xiaoqian Lai, Baofa Cheng, Hua-Xin Peng

doi:10.1016/j.compstruct.2025.119129

 

多向CFRP薄板拉伸拟延性及多阶段破坏过程的分析预测方法

This paper presents an analytical model for predicting the nonlinear tensile response and progressive failure modes of multidirectional laminates. The proposed method extends the unidirectional pseudo-ductility model to multidirectional laminates and captures the complete failure process by taking accounts of various failure modes, including fiber breakage, matrix transverse failure, free-edge delamination, and potential intermediate layer fragmentation and delamination. Combining the matrix nonlinearity with fiber fracture and delamination in the intermediate layer, the [±θn/0°m/±θn] configuration theoretically exhibits the highest uniaxial tensile pseudo-ductility, which is influenced by factors such as ply thickness, ply angle, and proportion of plies. Tensile testing on specimens with various thin-ply [±θn/0°2/±θn] configurations were conducted to validate the accuracy of the prediction model. The results showed a good agreement in the stress–strain responses. Furthermore, the [±30°6/0°2/±30°6] configuration exhibited intermediate ply fragmentation with a pseudo-ductile strain of 4.04 %, while other configurations with higher 0° ply proportions experienced catastrophic delamination or fracture. The Digital Image Correlation (DIC) results illustrated the strain evolution process, showing progressive delamination for the [±30°6/0°2/±30°6] configuration and catastrophic delamination for the [±30°4/0°2/±30°4] configuration. The analytical approach offers a straightforward method for capturing failure modes and stress–strain responses, facilitating pseudo-ductility design in multidirectional laminates.

本文提出了一种用于预测多向层合板非线性拉伸响应和渐进失效模式的分析模型。所提出的方法将单向伪延展性模型扩展到多向层合板，并通过考虑包括纤维断裂、基体横向失效、自由边脱层以及中间层潜在的断裂和脱层等各种失效模式，来捕捉完整的失效过程。将基体非线性与中间层的纤维断裂和脱层相结合，[±θn/0°m/±θn]结构理论上表现出最高的单轴拉伸伪延展性，其受铺层厚度、铺层角度和铺层比例等因素的影响。对具有不同薄铺层[±θn/0°2/±θn]结构的试样进行了拉伸试验，以验证预测模型的准确性。结果表明应力 - 应变响应吻合良好。此外，[±30°6/0°2/±30°6] 配置表现出中等程度的铺层破碎，其伪延性应变值为 4.04%，而其他 0°铺层比例更高的配置则经历了灾难性的分层或断裂。数字图像相关（DIC）结果展示了应变演化过程，表明[±30°6/0°2/±30°6]配置出现渐进式分层，而[±30°4/0°2/±30°4]配置则发生灾难性分层。这种分析方法为捕捉失效模式和应力应变响应提供了一种直接的方法，有助于多向层合板的伪延性设计。

Enhanced impregnation behavior and interfacial bonding of CF/PEEK composites by regulating molecular weight of poly (aryl ether ketone) interfacial binder

Jinze Cui, Xiyan Li, Yutai Luo, Simin Zhang, Feng Bao, Jiali Yu, Huichao Liu, Caizhen Zhu, Jian Xu

doi:10.1016/j.compstruct.2025.119107

通过调节聚芳醚酮界面粘合剂的分子量来增强CF/PEEK复合材料的浸渍行为和界面键合

The primary obstacle to enhancing the mechanical performance of CF/PEEK composites is the insufficient interfacial bonding strength and poor impregnation properties. The present study addresses this issue by focusing on the development of a highly heat-resistant and easily soluble poly (aryl ether ketone) (PFEEK) interfacial binder as well as a processing technology for chopped ultra-thin CF tapes. As a result, the CF/PEEK-2 composites (Mw: 12000 g/mol) exhibited optimal mechanical performance with interlaminar shear strength (ILSS), tensile strength, tensile modulus, tensile toughness, flexural strength, and flexural modulus of 86.0 MPa, 772.9 MPa, 50.2 GPa, 13.5 MJ/m3, 878.5 MPa, and 47.8 GPa, respectively, which can be attributed to the excellent impregnation properties and wettability of the CF bundles and PEEK matrix. Therefore, a heat-resistant (Tg  > 250°C; Td5% > 485°C) and diffluent PFEEK binder will provide crucial guidance for further large-scale applications of high-end CF/PEEK composites.

提高CF/PEEK复合材料力学性能的主要障碍是界面结合强度不足和浸渍性能差。本研究通过开发一种高度耐热和易溶的聚芳醚酮（PFEEK）界面粘合剂以及一种切碎超薄CF带的加工技术来解决这一问题。结果表明，CF/PEEK-2复合材料（Mw: 12000 g/mol）的力学性能最佳，层间剪切强度（ILSS）、抗拉强度、抗拉模量、抗拉韧性、抗弯强度和抗弯模量分别为86.0 MPa、772.9 MPa、50.2 GPa、13.5 MJ/m3、878.5 MPa和47.8 GPa，这主要归功于CF束和PEEK基体优异的浸渍性能和润湿性。因此，耐热(Tg  > 250°C;Td5%

 

485°C)和分流式PFEEK粘结剂将为高端CF/PEEK复合材料的进一步大规模应用提供重要指导。

In-depth tool wear analysis in drilling of CFRP-Ti stacks by DLC coated drills

Sharjeel Ahmed Khan, Raphaël Royer, Marta Saraiva, Nazanin Emami, Amilcar Ramalho

doi:10.1016/j.compstruct.2025.119110

DLC涂层钻头在CFRP-Ti堆钻进过程中刀具磨损的深入分析

Spurred by the growing trend towards sustainability and use of green material alternatives, Carbon Fiber Reinforced Polymer paired with Titanium alloys (CFRP-Ti stacks) are employed in aerospace industry for their high strength-to-weight ratio and good galvanic corrosion resistance. However, production of holes for bolts or rivets connections, imperative for components assembly depicts unmatched difficulties in their machinability due to superior mechanical characteristic and distinct nature of stack components, causing rapid tool wear and compromised hole quality. In this work, in-depth tool wear analysis of Diamond-like-Carbon (DLC) coated drills were analysed periodically to evaluate tool wear growth and associated wear mechanism while drilling of CFRP-Ti stacks. Qualitative analysis was performed after drilling set number of holes by two DLC coated drills (DLC-Ar and DLC-Bn), and results compared with uncoated solid carbide (WC) drills under similar dry machining conditions. The wear progress was observed by SEM and EDX; and for extensive wear mechanism investigation, Focused Ion Beam (FIB) cross-sections were analysed. Moreover, morphological examination of etched drills after drilling experiment was performed to observe active cutting regions for overall damage extent, gain insight about coating reminiscences and underlying wear mechanism. The results demonstrate that DLC-Bn drill showed best performance with reduced thrust forces and torque, reduced wear of cutting edges and no fracture/chipping of drill corner compared to DLC-Ar and WC drill. Although, DLC-Ar drill does alleviate corner chipping but suffer premature coating failure, undergoes intense tribo-chemical wear, removal of carbide grains and generation of highest thrust forces compared to WC drill.

在可持续发展和使用绿色材料替代品的日益增长的趋势的推动下，碳纤维增强聚合物与钛合金（CFRP-Ti堆叠）因其高强度重量比和良好的抗电蚀性而被用于航空航天工业。然而，对于组件组装来说，螺栓或铆钉连接孔的生产是必不可少的，由于堆叠组件优越的机械特性和独特的性质，它们在可加工性方面遇到了无与伦比的困难，导致工具快速磨损和孔质量受损。在这项工作中，对类碳金刚石（DLC）涂层钻头进行了深入的刀具磨损分析，以评估CFRP-Ti堆钻进过程中刀具磨损的增长及其相关磨损机制。用两种DLC涂层钻头（DLC- ar和DLC- bn）钻出一定数量的孔后进行定性分析，并将结果与未涂层的WC钻头在类似干加工条件下进行比较。通过SEM和EDX观察了磨损过程；为了进行广泛的磨损机理研究，对聚焦离子束（FIB）截面进行了分析。此外，在钻孔实验后，对蚀刻钻头进行形态学检查，观察活性切削区域的整体损伤程度，了解涂层的记忆和潜在的磨损机制。结果表明，与lc - ar和WC钻头相比，lc - bn钻头在减小推力和扭矩、减少刃口磨损和无钻头角断裂/切屑方面表现出最佳性能。尽管与WC钻头相比，lc - ar钻头确实减轻了角屑，但会导致涂层过早失效、剧烈的摩擦化学磨损、碳化物颗粒的去除以及产生最大的推力。

Optimization of assembly parameters for composite bolted joints aiming at time-varying bearing reliability improvement

Qingyuan Lin, Yong Zhao, Yuming Liu, Wei Pan, Yu Ren, Wencai Yu

doi:10.1016/j.compstruct.2025.119113

面向时变轴承可靠性提高的复合螺栓连接装配参数优化

Bolted connections are a common assembly form for composite structures. Different assembly parameters may lead to multiply differences in the strength of composite bolted joints. Low structural reliability is currently a key bottleneck that restricts the performance improvement of composite devices. In this study, the uncertainty characteristics of the washer structure parameters, interface friction coefficients and tightening process parameters under different machining methods, interface treatments and tightening control methods are analyzed through batch experimental tests. Then the data set with assembly parameters as input and structural bearing limit as output is constructed through batch virtual tightening- tensile experiments. The data-driven algorithm is used to construct a fast prediction model of the bearing limit, and the time-varying uncertainty analysis of the bearing limit and the bearing reliability evaluation method are established. Finally, the method is used to realize the bearing reliability improvement by regulating the uncertainty to optimize the assembly parameters. The uncertainties in the assembly parameters of the composite bolted joints obtained through experimental tests in this study can provide a reference for related researches. The established data-driven fast prediction model of bearing limits provides an effective tool for statistical analysis of bearing limits and bearing reliability assessment.

螺栓连接是复合材料结构常用的一种装配形式。不同的装配参数会导致复合螺栓连接强度的多重差异。结构可靠性低是目前制约复合材料器件性能提升的关键瓶颈。通过批量试验，分析了不同加工方式、界面处理方式和拧紧控制方式下垫圈结构参数、界面摩擦系数和拧紧工艺参数的不确定性特征。然后通过批量虚拟拉紧实验，构建了以装配参数为输入，结构承载极限为输出的数据集。采用数据驱动算法构建了轴承极限快速预测模型，建立了轴承极限时变不确定性分析和轴承可靠性评估方法。最后，利用该方法通过调节装配参数的不确定性来实现轴承可靠性的提高。本研究通过试验试验获得的复合材料螺栓连接装配参数的不确定性可为相关研究提供参考。建立了数据驱动的轴承极限快速预测模型，为轴承极限统计分析和轴承可靠性评估提供了有效的工具。

Macro-Micro structure engineering for reed-derived biochar composites to achieve synergetic dissipation capacities towards wide-band and strong electromagnetic wave absorption

Yunpeng Ye, Xia Zheng, Chengliang Zhou, Xingong Li

doi:10.1016/j.compstruct.2025.119116

芦苇衍生生物炭复合材料的宏观微观结构工程，以实现对宽带强电磁波吸收的协同耗散能力

Achieving integration of strong electromagnetic wave (EMW) absorption and wide absorption bandwidth through a single-component carbonaceous absorber is still considered a huge challenge due to the impedance mismatch and limited loss mechanisms. Herein, a reed-derived carbon/epoxy (RC/EP) composite absorber with ultra-wide absorption bandwidth and highly strong EMW absorption was fabricated by simultaneous regulation on the micro-structure of RC and establishment of macro-gradient of RC in EP matrix. The compartmentalized structure and gradient distribution of the optimized RC in the EP matrix boosted the reflection and scattering of the EMW, contributing outstanding impedance matching and synergetic EMW dissipation. Therefore, the RC/EP composite with the thickness of 2.0 mm presented a minimum reflection loss (RLmin) of −54.3 dB and an effective absorption bandwidth (EAB) of 6.12 GHz. Varying the content and distribution of RC, the EAB of the RC/EP can cover 99.7 % of the whole Ku band. In addition, the stealth performance of RC/EP absorbing materials under actual far-field conditions is confirmed using Computer Simulation Technology (CST). This work provides a new way to realize a single-component carbonaceous absorber with both broadband and strong EMW absorbing capability, which can satisfy a wide range of applications in the fields of electronics, medical protection, and architectural invisible materials.

由于阻抗失配和有限的损耗机制，通过单组分碳质吸收器实现强电磁波吸收和宽吸收带宽的集成仍然被认为是一个巨大的挑战。通过对芦苇基碳/环氧树脂（RC/EP）的微观结构进行调控，并在EP基体中建立宏观梯度，制备了一种吸收带宽超宽、吸收EMW强度高的芦苇基碳/环氧树脂（RC/EP）复合吸收材料。优化后的RC在EP矩阵中的分层结构和梯度分布增强了EMW的反射和散射，具有良好的阻抗匹配和协同EMW耗散。因此，厚度为2.0 mm的RC/EP复合材料的最小反射损耗（RLmin）为−54.3 dB，有效吸收带宽（EAB）为6.12 GHz。改变RC的含量和分布，RC/EP的EAB可覆盖整个Ku波段的99.7 %。此外，利用计算机仿真技术（CST）验证了RC/EP吸波材料在实际远场条件下的隐身性能。本工作为实现具有宽带和强吸收EMW能力的单组分碳质吸收材料提供了一条新途径，可满足电子、医疗防护和建筑隐形材料等领域的广泛应用。

A new bionic lattice structure design and compressive mechanical properties based on the beetle elytra

Zhixuan Sun, Yu Gong, Kun Chen, Hao Liu, Jianyu Zhang, Libin Zhao, Ning Hu

doi:10.1016/j.compstruct.2025.119117

基于甲虫鞘翅的仿生晶格结构设计及压缩力学性能研究

To meet the demand for lightweight and high-strength materials in engineering applications, this research draws inspiration from the microscopic support structure of the beetle’s elytra. A novel hourglass-shaped lattice (HSL), based on biomimetic principles, was designed by extracting and transforming the hollow strut features of the beetle’s elytra. Nylon PA2200 was chosen as the matrix material for the specimen, which was fabricated using additive manufacturing and then subjected to a quasi-static compression test. The experimental results showed that the standard HSL structure (HSL-2S) possessing two connecting rods had a maximum increase in elastic modulus by 54.89 %, yield strength by 128.99 %, and compressive strength by 218.08 % as compared to the Circle, Square, and Square-incline thin-walled structures. Additionally, this research provided an in-depth analysis of the influence of design parameters, including the number of rods and the thickness of the shell, on structural performance using the method of controlled variables. The results showed that a reasonable arrangement of rods most effectively improves the mechanical performance of the structure. The research findings offered valuable design references for the development of lattice structures with excellent mechanical properties and efficient energy absorption.

为了满足工程应用中对轻量化和高强度材料的需求，本研究从甲虫鞘翅的微观支撑结构中获得灵感。基于仿生学原理，通过提取和变换甲虫鞘翅的中空支撑特征，设计了一种新型的沙漏形晶格（HSL）。选取尼龙PA2200作为试样的基体材料，采用增材制造方法制备试样，进行准静态压缩试验。试验结果表明，与圆形、方形和方形倾斜薄壁结构相比，具有两根连杆的标准HSL结构（HSL- 2s）的弹性模量最大提高54.89 %，屈服强度最大提高128.99 %，抗压强度最大提高218.08 %。此外，本研究还采用控制变量的方法，深入分析了杆数和壳体厚度等设计参数对结构性能的影响。结果表明，合理的杆位布置最有效地提高了结构的力学性能。研究结果为开发具有优异力学性能和高效吸能性能的晶格结构提供了有价值的设计参考。

Composites Part A: Applied Science and Manufacturing

Moulding prepreg platelets into high fibre loading fraction carbon fibre-reinforced syntactic epoxy foams

Yifang Zhang, Jier Wang, Tuomas Turpeinen, Kristian Salminen, Joanne Li, Dharu Feby Smaradhana, Ajit Panesar, Koon-Yang Lee

doi:10.1016/j.compositesa.2025.108865

 

模压预浸片成高纤维负载分数碳纤维增强合成环氧泡沫

This study presents a novel method for manufacturing high fibre content carbon fibre-reinforced syntactic epoxy foams by moulding prepreg platelets with hollow glass microspheres. The prepreg platelets were either (i) dry-mixed at room temperature or (ii) mixed at cryogenic temperature in liquid nitrogen with hollow glass microspheres prior to compression moulding. This approach achieves a carbon fibre volume fraction of up to 49 %, addressing the limitations of low fibre content in conventional syntactic foams. The resulting materials exhibit enhanced mechanical properties, including a compressive modulus of ∼6 GPa and ∼3.5 GPa in the in-plane and through-thickness directions, respectively. The anisotropy in mechanical properties is attributed to the anisotropic packing of the prepreg platelets. Packing simulations using PyBullet confirmed that microspheres did not disrupt platelet arrangement, maintaining a packing efficiency of ∼63 % while filling inter-platelet gaps. Although cryogenic processing improved the mixing process, its impact on mechanical performance was minimal. This study demonstrates a simple manufacturing approach to produce high performance carbon fibre reinforced porous polymer composites suitable for lightweighting applications.

本文提出了一种用中空玻璃微珠模塑预浸料片来制备高纤维含量碳纤维增强复合环氧泡沫塑料的新方法。预浸血小板要么(i)在室温下干混合，要么（ii）在压缩成型之前在液氮中与中空玻璃微球低温混合。这种方法实现了高达49 %的碳纤维体积分数，解决了传统复合泡沫中纤维含量低的局限性。所得到的材料表现出增强的机械性能，包括面内和厚度方向的压缩模量分别为~ 6 GPa和~ 3.5 GPa。其力学性能的各向异性主要归因于预浸液血小板的各向异性填充。使用PyBullet进行的填充模拟证实，微球不会破坏血小板排列，在填充血小板间隙的同时保持约63 %的填充效率。虽然低温处理改善了混合过程，但其对机械性能的影响很小。这项研究展示了一种简单的制造方法来生产高性能碳纤维增强多孔聚合物复合材料，适用于轻量化应用。

Efficient analysis of characteristic responses to curing behavior using FBG sensors for residual strain controlling in CFRP laminates

Hongtao Wang, Jikang Zhao, Jingxuan Dong, Ke Xu, Hongbo Geng, Xiaopeng Chen, Tianming Li, Guipin Yao, Xiaolong Jia, Lei Ge, Xiaoping Yang

doi:10.1016/j.compositesa.2025.108869

 

基于FBG传感器的CFRP复合材料残余应变控制固化特性响应分析

Fiber Bragg Grating (FBG) in-situ monitoring systems have become an effective tool for assisting with the high-precision molding and process optimization of carbon fiber-reinforced polymers (CFRP). This study aims to explore the underlying mechanisms by which FBG sensing signals characterize the curing behavior of CFRP. Initially, based on in-situ/non in-situ testing methods, the characteristic responsiveness of FBG sensing signals to the curing behavior of CFRP was explored. Furthermore, the feature response amplitude was used to evaluate the feature responsiveness of embedding setups (packaging structure and embedding techniques) to phase transitions. It was found that non-uniform adhesion and consolidation affected the sensor’s representation of curing shrinkage. Finally, using high characteristic response FBG sensors, the process optimal strategy for CFRP was explored. The proposed method for analyzing the characteristic response of FBG sensing signals establishes and validates the relationship between CFRP curing behaviors and signal points, as well as stage-specific amplitude changes. This research serves as a fundamental basis for accurately characterizing CFRP curing behaviors and enhancing high-precision forming process design.

光纤布拉格光栅（FBG）原位监测系统已成为辅助碳纤维增强聚合物（CFRP）高精度成型和工艺优化的有效工具。本研究旨在探索光纤光栅传感信号表征CFRP固化行为的潜在机制。首先，基于原位/非原位测试方法，探讨了FBG传感信号对CFRP固化行为的特征响应性。此外，利用特征响应幅度来评估嵌入装置（封装结构和嵌入技术）对相变的特征响应性。发现不均匀的粘结和固结影响了传感器对固化收缩的表征。最后，利用高特性响应FBG传感器，探讨了碳纤维增强塑料的工艺优化策略。所提出的FBG传感信号特征响应分析方法建立并验证了CFRP固化行为与信号点之间的关系，以及特定阶段的幅度变化。该研究为准确表征碳纤维增强材料的固化性能，提高高精度成形工艺设计提供了基础依据。

Robust and durable collagen-based fibers through dual cross-linking for eco-friendly slow fashion

Feng Liang, Xin Cheng, Yuling Tang, Shuangyang Li, Jianfei Zhou, Bi Shi

doi:10.1016/j.compositesa.2025.108871

 

坚固耐用的胶原纤维通过双交联环保慢时尚

Slow fashion, as a strategic alternative aimed at mitigating resource waste and environmental degradation in fast fashion, necessitates the development of robust and durable fibers. Collagen-based fibers have emerged as a promising option due to their moisture properties, biodegradability, and biocompatibility for durable textiles. However, these fibers encounter significant challenges in terms of mechanical strength, durability, and viability for sustainable production. In this study, robust and durable collagen-based fibers were designed using a dual cross-linking strategy and continuously prepared in situ via a low-temperature aqueous coagulation device. During wet spinning, polyvinyl alcohol (PVA) and aluminum chloride (AlCl3) act as the continuant and cross-linker, respectively. AlCl3 effectively chelates the carboxyl groups on the collagen molecular chains and the reactive hydroxyl groups on the PVA chains, forming a stable coordination-hydrogen bond dual cross-linking network. Optimization of the spinning parameters resulted in fibers exhibiting superior mechanical properties, with a tensile strength of 339 MPa, Young’s modulus of 12.9 GPa, and toughness of 93 MJ/m3. Additionally, these fibers demonstrate a 10.8 % moisture regain and a dyeing grade of 4, highlighting their enhanced durability and breathability. This research provides robust solutions for enduring fibers and sustainable manufacturing processes in the slow fashion sector, facilitating new opportunities for the sustainable utilization of collagen waste.

慢时尚作为一种战略选择，旨在减少快时尚的资源浪费和环境退化，需要开发坚固耐用的纤维。胶原蛋白基纤维因其防潮性、可生物降解性和耐用纺织品的生物相容性而成为一种很有前途的选择。然而，这些纤维在机械强度、耐用性和可持续生产的可行性方面面临着重大挑战。在这项研究中，采用双交联策略设计了坚固耐用的胶原基纤维，并通过低温水凝装置在原位连续制备。湿法纺丝时，聚乙烯醇（PVA）和氯化铝（AlCl3）分别作为连续剂和交联剂。AlCl3有效地螯合胶原分子链上的羧基和PVA分子链上的活性羟基，形成稳定的配位-氢键双交联网络。通过对纺丝参数的优化，纤维的抗拉强度为339 MPa，杨氏模量为12.9 GPa，韧性为93 MJ/m3。此外，这些纤维的回潮率为10.8 %，染色等级为4，突出了它们增强的耐用性和透气性。这项研究为慢时尚领域的耐用纤维和可持续制造工艺提供了强有力的解决方案，为胶原蛋白废物的可持续利用提供了新的机会。

Integration of polysiloxane-modified halloysite nanoclay nanocomposite coatings on fiber-reinforced polymeric composites structures: Part II—Icing/deicing, self-cleaning, sandpaper abrasion, and water immersion performances

Halil Burak Kaybal, Hayrettin Duzcukoglu, Ramazan Asmatulu

doi:10.1016/j.compositesa.2025.108879

聚硅氧烷改性高岭土纳米复合涂层在纤维增强聚合物复合材料结构上的集成：第二部分——结冰/除冰、自清洁、砂纸磨损和水浸性能

Cold weather conditions such as frost, snow, and freezing rain can limit the performance of fiber-reinforced composites, commonly used in aviation, defense, automotive, and other industries, potentially causing damage. Ice accumulation on surfaces can disrupt systems and damage components. Superhydrophobic (SH) surfaces offer a solution to prevent ice formation. This study explores the development of SH nanocomposite coatings based on polysiloxane-modified halloysite nanoclay (HNC) for glass, carbon, and Kevlar composites. The coatings’ effectiveness in preventing and removing ice was evaluated through various tests, including ice adhesion and air-blowing tests. The results showed that the SH coatings enhanced ice dissipation, particularly for carbon fiber composites. Despite slight changes in water contact angle after repeated tests, the coatings retained SH properties. Self-cleaning and wear tests demonstrated that the coatings successfully repelled dust and pollutants, while maintaining mechanical durability. This work offers a promising approach to improve ice-prevention performance in critical industrial applications.

寒冷的天气条件，如霜冻、雪和冻雨，会限制纤维增强复合材料的性能，通常用于航空、国防、汽车和其他行业，可能造成损害。表面结冰会破坏系统并损坏部件。超疏水（SH）表面提供了一种防止结冰的解决方案。本研究探讨了基于聚硅氧烷改性高岭土纳米粘土（HNC）的玻璃、碳和凯夫拉复合材料的SH纳米复合涂层的发展。通过各种测试，包括冰附着和吹气测试，评估了涂层的防冰和除冰效果。结果表明，SH涂层增强了冰的耗散，特别是对于碳纤维复合材料。尽管反复试验后水接触角略有变化，但涂层保持了SH性能。自清洁和磨损测试表明，涂层成功地排斥灰尘和污染物，同时保持机械耐久性。这项工作为提高关键工业应用中的防冰性能提供了一种有前途的方法。

An improved progressive damage model for three-dimensional five-directional braided composites under longitudinal compression

Shaofeng Tang, Kunkun Fu, Yan Li

doi:10.1016/j.compositesa.2025.108880

纵向压缩下三维五向编织复合材料的改进渐进损伤模型

Various failure modes of three-dimensional five-directional braided composites (3D5DBCs) under longitudinal compression have been observed, including yarn fracture and kinking, transverse inter-fiber cracking, matrix plastic deformation/fracture and fiber/matrix interfacial debonding, leading to the difficulty in predicting their mechanical properties. This study proposes an improved progressive damage model for 3D5DBCs under longitudinal compression, addressing all the observed failure modes. Then, the proposed progressive damage model is implemented in a finite element (FE) model to predict the mechanical responses and properties of 3D5DBCs under longitudinal compression. The numerical predictions in terms of compressive stress–strain relations, compressive strengths and failure modes are in good agreement with the experimental results, demonstrating the effectiveness of the proposed progressive damage model. Finally, the failure envelopes of 3D5DBCs under compression-shear loading are predicted using our FE model, and the effectiveness of several classical failure criteria on the strength prediction of 3D5DBCs is discussed.

三维五向编织复合材料（3D5DBCs）在纵向压缩下的破坏模式多种多样，包括纱线断裂和扭结、纤维间横向开裂、基体塑性变形/断裂和纤维/基体界面脱粘，导致其力学性能难以预测。本研究提出了一种改进的3D5DBCs在纵向压缩下的渐进损伤模型，涵盖了所有观察到的破坏模式。然后，将提出的渐进式损伤模型应用于有限元模型中，预测了3D5DBCs在纵向压缩下的力学响应和性能。在压应力-应变关系、抗压强度和破坏模式方面的数值预测与试验结果吻合较好，验证了所提渐进损伤模型的有效性。最后，利用有限元模型预测了压剪作用下3D5DBCs的破坏包络，并讨论了几种经典破坏准则对3D5DBCs强度预测的有效性。

Composites Part B: Engineering

Shock Response of Unidirectional Carbon Fibre-Reinforced Polymer Composites: Influences of Fibre Orientation and Volume Fraction

Suman Shah, Paul J. Hazell, Hongxu Wang, Juan P. Escobedo

doi:10.1016/j.compositesb.2025.112438

单向碳纤维增强聚合物复合材料的冲击响应：纤维取向和体积分数的影响

This study investigates the shock wave propagation in unidirectional carbon fibre-reinforced polymer (UD-CFRP) composites, focusing on the effects of varying fibre orientations (0°, 30°, 45°, 60°, and 90°) and fibre volume fractions (64% and 51%). Through a series of plate impact experiments at approximately 400 m/s, the results revealed that longitudinal stress was highest at 0° orientation (around 3 GPa) and decreased by nearly 50% at 90°, where the bulk response mirrored that of pure epoxy. A distinct two-wave structure, consisting of an elastic precursor and a plastic shock wave, was observed at 0° orientation and higher impact velocities, requiring a minimum stress of 3 GPa. Fibre content showed only a marginal influence on shock behaviour, with the epoxy matrix playing a dominant role at higher orientations. These findings highlight the critical role of fibre alignment and matrix properties in governing shock resistance of the composite, suggesting the need for further exploration of matrix materials and composite design optimisation.

本研究研究了单向碳纤维增强聚合物（UD-CFRP）复合材料中的冲击波传播，重点研究了不同纤维取向（0°、30°、45°、60°和90°）和纤维体积分数（64%和51%）对冲击波传播的影响。通过一系列以400 m/s左右速度进行的板冲击实验，结果表明，纵向应力在0°取向时最高（约3 GPa），在90°取向时下降近50%，其体响应与纯环氧树脂相似。在0°取向和更高的冲击速度下，观察到一种明显的双波结构，由弹性前驱体和塑性冲击波组成，所需的最小应力为3gpa。纤维含量对冲击性能的影响很小，而环氧基在高取向下起主导作用。这些发现强调了纤维取向和基体性能在控制复合材料抗震性方面的关键作用，表明需要进一步探索基体材料和复合材料设计优化。

Rapid estimation of residual stress in composite laminates using a deep operator network

Seung-Woo Lee, Teubes Christiaan Smit, Kyusoon Jung, Robert Grant Reid, Do-Nyun Kim

doi:10.1016/j.compositesb.2025.112409

 

基于深度算子网络的复合材料层合板残余应力快速估计

A deep operator network (DeepONet) is designed and developed for rapid estimation of residual stress in composite laminates, which traditionally requires intensive finite element method (FEM) calculations to calibrate the incremental hole-drilling (IHD) method used in measuring residual stresses. The proposed DeepONet model incorporates graph convolution, trigonometric series expansion, and Monte Carlo dropout to effectively learn the relationship between residual stress distribution and the corresponding deformation observed in the IHD procedure. This learning is based on FEM data from various symmetric composite laminate configurations, which are composed of eight layers of fiber-reinforced plates with possible ply orientations at −45°, 0°, 45°, and 90°. Trained on 30 configurations, the proposed model exhibits strong generalization capabilities over an additional 40 unseen configurations, achieving a forward strain prediction error of 1.59% and an inverse stress calculation error of 3.92%. These errors are within the range of experimental noise and corresponding stress uncertainty levels commonly encountered in real experiments. The performance of the model suggests the potential for establishing a comprehensive database for the IHD method as applied to composite materials, filling a significant gap in resources when compared to those available for metallic materials.

为了快速估计复合材料层合板的残余应力，设计并开发了一种深度算子网络（DeepONet），该网络传统上需要密集的有限元方法（FEM）来校准用于测量残余应力的增量钻孔（IHD）方法。提出的DeepONet模型结合了图卷积、三角级数展开和蒙特卡罗dropout，有效地学习了IHD过程中观察到的残余应力分布与相应变形之间的关系。这种学习是基于各种对称复合层压板配置的有限元数据，这些配置由八层纤维增强板组成，可能的铺层方向为 -45°、0°、45° 和 90°。 这些误差在实验噪声和实际实验中经常遇到的相应应力不确定性水平的范围内。该模型的性能表明，有可能为应用于复合材料的IHD方法建立一个综合数据库，填补与金属材料相比资源方面的重大空白。

Ultra Stable and Stretchable Liquid-Metal Precisely Patterned Circuits for Integrated Wearable Devices under Heat-Pressed

Xiuli Yang, Yanan Shi, Fujun Tian, Yin He, Hao Liu, Peng Zhou

doi:10.1016/j.compositesb.2025.112439

 

热压下集成可穿戴设备的超稳定和可拉伸液态金属精确图案电路

Liquid metal (LM) has widespread applications in flexible wearable electronic devices. Despite this, challenges persist with LM and thermoplastic polyurethane (TPU) composite materials in creating flexible electronic circuits, including complex processes, limited pattern precision and material inefficiencies. This study introduced a LM composite material, TPU@LM ink, suitable for dispensing printing. By fine-tuning the ratio of LM to TPU, this ink enabled the production of micron-scale ultrastable flexible circuits. The patterned TPU@LM circuit achieved a minimum line width of 239.01 μm and conductivity of 7.5×103 S/cm, exhibiting stretchable conductivity stability (1000 cycles), thermal stability (25°C–100°C) and repairability. The hysteresis error of the sensing performance was only ±3.18% upon stretching to 400%. The circuit could be repeated 2000 times and could detect a tensile strain of 0.5%. The temperature of the TPU@LM circuit could be increased to 70.51°C, the temperature only decreased by 0.4°C after stretching 2000 times and the heating-cooling process could be cycled. Additionally, the recovery rate of TPU@LM ink was 93.8% and it could be reused. Additionally, motion monitoring and thermal therapy experiments confirmed that the TPU@LM circuit maintains stable conductivity under high temperature and pressure conditions (100°C and 20 kPa), facilitating seamless integration between the TPU@LM circuit and clothing and accessories.

液态金属在柔性可穿戴电子器件中有着广泛的应用。尽管如此，LM和热塑性聚氨酯（TPU）复合材料在制造柔性电子电路方面仍然存在挑战，包括复杂的工艺、有限的图案精度和材料效率低下。本研究介绍了一种适用于点胶印刷的LM复合材料TPU@LM油墨。通过微调LM与TPU的比例，这种墨水可以生产微米级的超稳定柔性电路。该图像化TPU@LM电路的最小线宽为239.01 μm，电导率为7.5×103 S/cm，具有可拉伸的电导率稳定性（1000次循环），热稳定性（25°C - 100°C）和可修复性。拉伸至400%时，传感性能的滞后误差仅为±3.18%。该电路可重复2000次，可检测0.5%的拉伸应变。TPU@LM电路的温度可提高到70.51℃，拉伸2000次后温度仅下降0.4℃，可循环加热-冷却过程。TPU@LM油墨回收率为93.8%，可重复使用。此外，运动监测和热治疗实验证实，TPU@LM电路在高温高压条件下（100°C和20 kPa）保持稳定的导电性，促进TPU@LM电路与服装和配件之间的无缝集成。

A barnacle-inspired interface for enhancing the interfacial properties of carbon fiber-reinforced poly(phthalazinone ether nitrile ketone) composite

Xingyao Liu, Xiaoqing Sun, Peifeng Feng, Xinyu Fan, Zhongwei Yan, Xigao Jian, Yujie Song, Jian Xu

doi:10.1016/j.compositesb.2025.112440

一种受藤壶启发的界面，用于增强碳纤维增强聚（酞嗪酮醚腈酮）复合材料的界面性能

Carbon fiber-reinforced thermoplastic resin composites (CFRTPs) have gained significant recognition in industries such as rail transportation, aerospace, and wind power generation. Among these composites, carbon fiber/poly(phthalazinone ether nitrile ketone) (CF/PPENK) composite is considered to be a high potential CFRTP because of the exceptional thermal stability and solubility of its matrix. However, due to the smooth surface of CF and the limited number of reactive groups in PPENK, the CF/PPENK composite demonstrated poor interfacial properties. In this study, drawing inspiration from the strong adhesive properties of barnacle structures, three different interfacial phases were fabricated on the CF surface. In these composites, polydopamine (PDA) particles acted as “barnacle glue” and three types of polyhedral oligomeric silsesquioxane (POSS) acted as “barnacles”. The practicality and effectiveness of the design was initially verified by molecular dynamics simulations, which predicted optimal interfacial properties of the composite with PDA and 3-glycidyloxypropyl-POSS (EP) on the fiber surface (CF-PDA-EP/PPENK). X-ray photoelectron spectroscopy and scanning electron microscopy analyses confirmed the successful combination between the “barnacle structure” and CF. The experimental results aligned well with the simulation outcomes, validating that the interfacial properties of CF-PDA-EP/PPENK were optimal. Compared to the composites with unmodified fibers, the interlaminar shear strength and interfacial shear strength of CF-PDA-EP/PPENK were enhanced by 55.56% and 210.73%, respectively. This method offers an efficient and straightforward approach to the interfacial modification of the composites.

碳纤维增强热塑性树脂复合材料（CFRTPs）在铁路运输、航空航天和风力发电等行业中获得了显著的认可。在这些复合材料中，碳纤维/聚（酞嗪酮醚腈酮）（CF/PPENK）复合材料由于其优异的热稳定性和基体的溶解度被认为是高潜力的CFRTP。然而，由于CF表面光滑，且PPENK中的反应基团数量有限，CF/PPENK复合材料表现出较差的界面性能。在本研究中，从藤壶结构的强粘接特性中获得灵感，在CF表面制备了三种不同的界面相。在这些复合材料中，聚多巴胺（PDA）颗粒充当“藤胶”，三种多面体低聚硅氧烷（POSS）充当“藤胶”。通过分子动力学模拟初步验证了该设计的实用性和有效性，预测了PDA和纤维表面3-缩水甘油酰氧丙基poss (EP) （CF-PDA-EP/PPENK）复合材料的最佳界面性能。x射线光电子能谱和扫描电镜分析证实了“藤瓶结构”与CF的成功结合，实验结果与模拟结果吻合良好，验证了CF- pda - ep /PPENK的界面性能是最优的。与未改性纤维相比，CF-PDA-EP/PPENK的层间剪切强度和界面剪切强度分别提高了55.56%和210.73%。该方法为复合材料的界面改性提供了一种简单有效的方法。

A novel near-α high temperature titanium alloy with trimodal microstructure and submicron-nanosilicides for superior mechanical properties at both room and elevated temperatures

Binlin Qu, Changjiang Zhang, Qihao Lian, Yulei Deng, Shuzhi Zhang, Zhaoxin Du, Jianchao Han, Bin Wang, Tao Wang, Xinyu Zhang

doi:10.1016/j.compositesb.2025.112441

 

一种新型的近α高温钛合金，具有三模态组织和亚微米纳米硅化物，在室温和高温下都具有优异的力学性能

To address the persistent challenge of balancing room and elevated temperature mechanical properties in conventional near α titanium alloys, this study proposes an innovative approach through compositional design and thermomechanical treatment process optimization. A high Zr/Si containing near-α titanium alloy was developed by decreasing-temperature multidirectional forging (DMDF) and subsequent heat treatment, yielding a trimodal microstructure consisting of lamellar primary α-phase (αl), equiaxed primary α-phase (αe) and transformed β-phase (βt). This microstructure features a hierarchical dispersion of dual-scale silicides, where submicron-scale silicides are preferentially distributed along grain/phase boundaries, while nanoscale silicides are uniformly dispersed within grains. After DMDF followed by solution treatment at 950°C/40min (HT2), the alloy achieves superior room-temperature mechanical properties (UTS=1306.6 MPa, EL=7.5%), primarily attributed to synergistic strengthening effects involving multiscale precipitates (αS and dual-scale silicides), dislocation networks and activated slip systems. The alloy maintains excellent strength at elevated temperatures up to 650 °C, demonstrating a UTS of 799.8 MPa paired with an elongation of 16.2%. This sustained strength originates from strain gradient formation at α/β interfaces combined with dual-scale silicide pinning mechanisms. Additionally, the enhanced ductility at 650 °C arises from the slip bands within the α-phase and additional <c+a> dislocation activation. This design strategy of trimodal microstructure with hierarchical dispersion of dual-scale silicides provides a new perspective for tailoring high-temperature titanium alloys with balanced mechanical properties at both room and elevated temperatures.

为了解决传统近α钛合金平衡室温和高温力学性能的长期挑战，本研究提出了一种通过成分设计和热处理工艺优化的创新方法。通过降温多向锻造（DMDF）和热处理，制备了高Zr/Si含量的近α钛合金，形成了由片层初生α-相（αl）、等轴初生α-相（αe）和转变β-相（βt）组成的三模态组织。该结构具有双尺度硅化物分层分散的特点，其中亚微米尺度硅化物优先沿晶粒/相边界分布，而纳米尺度硅化物均匀分布在晶粒内。DMDF经950℃/40min （HT2）固溶处理后，合金获得了优异的室温力学性能（UTS=1306.6 MPa， EL=7.5%），这主要归功于多尺度析出相（αS和双尺度硅化物）、位错网络和活化滑移体系的协同强化效应。该合金在高达650°C的高温下保持优异的强度，显示出799.8 MPa的UTS和16.2%的延伸率。这种持续强度源于α/β界面应变梯度的形成以及双尺度硅化物钉钉机制。在650℃时，α-相内的滑移带和额外的< C +a>位错激活导致了塑性的增强。这种双尺度硅化物分层分散的三模态微观结构设计策略为定制室温和高温下力学性能平衡的高温钛合金提供了新的视角。

Achieving the simultaneous improvement of degradation, thermal, and mechanical properties of polylactic acid composite films by carbon quantum dots

Jianlong Chen, Xinyuan Guo, Rui Tan, Mengde Huang, Junchao Ren, Weiwei Liu, Mingfeng Wang, Bin Li, Zhong Ma, Qingfa Zhang

doi:10.1016/j.compositesb.2025.112442

利用碳量子点同时改善了聚乳酸复合薄膜的降解性能、热性能和力学性能

Having porous structure, large surface area, and high carbon content of biochar facilitates interface bonding of polylactic acid (PLA) composites, but uneven dispersion by its irregular morphology is becoming a new challenge in damaging properties. Based on this, the novelty of this study is using carbon quantum dots (CQDs) to overcome the performance defects of caused PLA composites by biochar while the ultimate goal is to reveal the influence mechanism of CQDs on structure, characteristics, and properties of PLA composites based on disclosing the forming mechanism of CQDs. It was found that adding CQDs accelerated the degradation of PLA from the results of Phosphate Buffer Saline (PBS) degradation, hydrolysis, and soil degradation. PLA/CQDs composite films also showed better thermal properties due to the excellent thermal stability of CQDs, and nucleation effect of CQDs should be responsible for the improvement of PLA crystallization. Additionally, having good activity, regular morphology, and uniform size of CQDs facilitated uniform dispersion and good interface combination in PLA system and thereby improved the tensile strength, tensile modulus, and elongation at break simultaneously. As a comparison, the tensile strength, tensile modulus, and elongation at break of 1 wt% PLA/CQDs composite films are 55.00 MPa, 1.76 GPa, and 9.84%, this provides a promising, sustainable, and eco-friendly solution for reinforcing PLA composites.

生物炭具有多孔结构、大表面积和高含碳量，有利于聚乳酸（PLA）复合材料的界面键合，但其不规则形态导致的不均匀分散成为破坏性能的新挑战。基于此，本研究的新颖之处是利用碳量子点（CQDs）来克服生物炭导致PLA复合材料性能缺陷，最终目的是在揭示CQDs形成机理的基础上，揭示CQDs对PLA复合材料结构、特性和性能的影响机理。从磷酸缓冲盐（PBS）降解、水解和土壤降解的结果发现，添加CQDs加速了PLA的降解。由于CQDs具有优异的热稳定性，PLA/CQDs复合薄膜表现出较好的热性能，CQDs的成核效应可能是PLA结晶性能改善的原因。此外，CQDs具有良好的活性、规则的形貌和均匀的尺寸，有利于在PLA体系中均匀分散和良好的界面结合，从而同时提高拉伸强度、拉伸模量和断裂伸长率。相比之下，1 wt% PLA/CQDs复合膜的拉伸强度、拉伸模量和断裂伸长率分别为55.00 MPa、1.76 GPa和9.84%，这为增强PLA复合材料提供了一种有前途的、可持续的、环保的解决方案。

In Situ Multi-Metal Alloying in Laser-Based Additive Manufacturing: A Concise Review

Dingmeng Xu, Wuxin Yang, Peng Cao

doi:10.1016/j.compositesb.2025.112443

激光增材制造中的原位多金属合金化：简要综述

Additive manufacturing (AM) has increasingly been employed for in situ alloying, facilitating the production of multi-metallic components, often referred to as multi-metal AM (MMAM). This approach enables the design of intricate, functional, and highly customized products with superior mechanical performance. Although the advancements in MMAM in-situ alloying have lagged behind those in single-metal AM, notable progress has been achieved in this emerging field. This concise review examines in situ alloying in laser-based AM alloys over the past decade, with a particular focus on titanium (Ti)-based MMAM and other metal systems. It systematically synthesizes current insights, addressing pre-processing preparations (e.g., powder feedstock preparation and modification), in-process adjustments (e.g., alternations in alloy chemistry and parameters optimization), and numerical simulations. These elements collectively exert a profound influence on the microstructural characteristics and mechanical performance of MMAM products.

增材制造（AM）越来越多地用于原位合金化，促进了多金属部件的生产，通常称为多金属AM （MMAM）。这种方法能够设计出复杂的、功能性的、高度定制的、具有优越机械性能的产品。尽管MMAM原位合金化的进展落后于单金属AM，但在这一新兴领域取得了显着进展。本文简要回顾了过去十年中激光增材制造合金的原位合金化，特别关注钛（Ti）基MMAM和其他金属系统。它系统地综合了当前的见解，解决了预处理准备（例如，粉末原料的制备和改性），过程中的调整（例如，合金化学和参数优化的改变）和数值模拟。这些因素共同对MMAM产品的显微组织特征和力学性能产生深远的影响。

Investigating Interfacial Properties vs Interphase Thickness in a Thermoplastic Composite

Pratik Koirala, Masoud Safdari, Filippo Mangolini, Mehran Tehrani

doi:10.1016/j.compositesb.2025.112444

热塑性复合材料界面性能与界面厚度的关系研究

Thermoplastic composites offer exceptional characteristics—particularly weldability, superior toughness, and potential for rapid out-of-autoclave processing—that make them highly attractive for diverse applications. The temperature history during their manufacturing plays a critical role in shaping key microstructural features, including fiber–matrix interfacial properties, matrix crystallinity, and interphase morphology. These characteristics, in turn, determine the composite’s macroscale mechanical performance. In carbon fiber-reinforced low-melt polyaryletherketone (LM-PAEK™) composites, the influence of processing conditions was systematically examined by producing three distinct sample types through automated fiber placement and post-processing: (1) fast cooling followed by cold crystallization, (2) controlled cooling from melt at 2 °C/min, and (3) fast cooling at rates exceeding 10,000 °C/min. Interfacial mechanical properties and interphase size were characterized using cyclic nanoindentation push-out tests and force-modulation atomic force microscopy, revealing that specimens cooled at 2 °C/min exhibit an interphase region approximately three times thicker than that of rapidly cooled specimens, with enhanced interfacial fiber–matrix strength and fracture toughness. These findings highlight the importance of controlling the interphase thickness in thermoplastic composites.

热塑性复合材料具有特殊的特性，特别是可焊性，优越的韧性，以及快速脱离高压灭菌器加工的潜力，使其在各种应用中具有很高的吸引力。制造过程中的温度历史对形成关键的微观结构特征起着关键作用，包括纤维-基质界面特性、基质结晶度和界面形态。这些特性反过来又决定了复合材料的宏观力学性能。在碳纤维增强低熔点聚芳醚酮（LM-PAEK™）复合材料中，通过自动纤维放置和后处理生产三种不同类型的样品，系统地检查了加工条件的影响：(1)快速冷却然后冷结晶，(2)以2°C/min的速度控制熔融冷却，(3)以超过10,000°C/min的速度快速冷却。利用循环纳米压痕推出试验和力调制原子力显微镜对界面力学性能和界面相尺寸进行了表征，结果表明，在2°C/min下冷却的样品的界面相区域厚度约为快速冷却样品的3倍，界面纤维基体强度和断裂韧性增强。这些发现突出了热塑性复合材料中控制界面厚度的重要性。

Interfacial behaviour of bonding between ultra-high performance concrete and concrete substrate: Evolution of microstructure and micromechanical properties

Facheng Song, Qinghua Li, Shilang Xu

doi:10.1016/j.compositesb.2025.112445

超高性能混凝土与混凝土基板粘结界面行为：微观结构和微观力学性能的演变

Ultra-high performance concrete (UHPC) is increasingly used to repair and strengthen deteriorated concrete structures. However, the crucial details of the microstructural evolution and micromechanical properties of overlay transition zone (OTZ) in composite structures are insufficiently understood. This study presents a systematic, curing-age-dependent investigation of OTZ between UHPC and concrete substrate (CS) across curing ages ranging from 1 to 28 days. A series of tests were performed to examine the hydration kinetics, grid elastic modulus, coefficient of friction, micromorphology, and 3D pore distribution of OTZ. Our findings suggest a dual-scale redefinition of OTZ: (a) a narrow OTZ affected by the wall effect and (b) a broad OTZ that encompasses the reaction zone on the CS surface, the narrow OTZ, and the air void-rich zone. The thickness of the broad OTZ is dominated by the air void-rich zone and decreases with curing age, measuring approx. 110 μm at 28 days. Ions from the fresh UHPC migrating towards the CS surface undergo mild, ongoing secondary reactions with the existing hydrates, generating additional Ca(OH)2. After 1 to 3 days of curing, an easily identifiable blend band of Ca(OH)2 and C-S-H gels and a tight bond between UHPC and CS can be seen simultaneously in the narrow OTZ. With prolonged curing (7 and 28 days), this band fades as most of Ca(OH)2 is converted into C-S-H gels due to the pozzolanic activity of silica fume. This study concludes with an in-depth discussion of the evolution mechanisms driving the microstructure and micromechanical properties of OTZ.

超高性能混凝土（UHPC）越来越多地用于修复和加固老化的混凝土结构。然而，对于复合材料结构中覆盖过渡带（OTZ）的微观组织演变和微观力学性能的关键细节还没有得到充分的了解。本研究对UHPC和混凝土基材（CS）之间的OTZ进行了系统的、与养护龄期相关的研究，养护龄期从1天到28天不等。进行了一系列测试，以检测OTZ的水化动力学、网格弹性模量、摩擦系数、微观形貌和三维孔隙分布。我们的研究结果提出了对OTZ的双重尺度重新定义：(a)受壁效应影响的窄OTZ和(b)包括CS表面反应区、窄OTZ和富空区在内的宽OTZ。宽OTZ的厚度以富气孔区为主，随龄期的增加而减小，约为。110 μm， 28天。从新鲜的UHPC迁移到CS表面的离子与现有的水合物发生温和的、持续的二次反应，产生额外的Ca(OH)2。固化1 ~ 3天后，在狭窄的OTZ中可以同时看到Ca(OH)2和C-S-H凝胶的明显共混带和UHPC与CS之间的紧密结合。随着固化时间的延长（7天和28天），由于硅灰的火山灰活性，大部分Ca(OH)2转化为C-S-H凝胶，这条带逐渐消失。最后，对OTZ的微观结构和微观力学性能的演化机制进行了深入的探讨。

Classification and Prediction of Flexural Properties of Bamboo Slices Made from Flattened Bamboo with a Gradient Structure Based on GA-BP Neural Network Model

Yuting Yang, Yu Luan, Jiarui Xu, Chaoran Lin, Yan He, Qin Su, Menghong Jiang, Jianchang Lian, Xuecai Ye, Long Feng, Meiling Chen, Changhua Fang

doi:10.1016/j.compositesb.2025.112446

基于GA-BP神经网络模型的梯度平直竹片抗弯性能分类与预测

Bamboo slices (BS) have been successfully used in bamboo winding composites due to their excellent flexural properties. However, BS with a gradient structure is prone to breakage easily during the winding process, particularly when varying thicknesses are involved. This study investigated flexural properties and size effects of BS, as well as prediction of their flexural properties. A mathematical relationship was established between fiber content of BS and its radial position, revealing an exponential decay function with an average fit quality of 0.9. The flexural strength, flexural modulus and radius of curvature of BS increased with higher fiber content. However, for BS with a thickness of 0.7 mm, the radius of curvature exhibited an inverse relationship with fiber content when the load was applied to the side of BS with fewer vascular bundles. Analysis indicated that BS with thicknesses of 0.3 mm and 0.5 mm can be considered homogeneous materials, while BS with a thickness of 0.7 mm retained the gradient structure and properties of bamboo culm wall. Additionally, BS showed a significant size effect, where thicker BS displayed lower strength due to defect effect, variation of length-thickness ratio and hoop effect. At last, a GA-BP neural network model was developed and validated as an effective tool for predicting BS flexural properties based on their radial position, achieving an accuracy of over 95%. This study provides valuable insights into the flexural properties and size effects of BS, providing a scientific foundation and technical support for the development of bamboo winding products.

竹片由于其优异的抗弯性能，已成功地应用于竹缠绕复合材料中。然而，梯度结构的BS在缠绕过程中容易断裂，特别是在涉及不同厚度的情况下。本研究探讨了BS的抗弯性能和尺寸效应，并对其抗弯性能进行了预测。建立了BS纤维含量与其径向位置之间的数学关系，显示出指数衰减函数，平均拟合质量为0.9。随着纤维含量的增加，BS的抗弯强度、抗弯模量和曲率半径增大。然而，对于厚度为0.7 mm的BS，当载荷施加在维管束较少的BS一侧时，曲率半径与纤维含量呈反比关系。分析表明，厚度为0.3 mm和0.5 mm的竹材可以认为是均匀材料，而厚度为0.7 mm的竹材则保留了竹材壁的梯度结构和特性。此外，BS具有显著的尺寸效应，其中较厚的BS由于缺陷效应、长厚比的变化和箍效应而强度较低。最后，建立了GA-BP神经网络模型，并验证了该模型是基于BS径向位置预测其弯曲性能的有效工具，准确率超过95%。本研究为竹材缠绕材料的弯曲性能和尺寸效应提供了有价值的见解，为竹材缠绕产品的开发提供了科学依据和技术支持。

Innovative Strategy to Reduce Autogenous Shrinkage in Alkali-Activated Slag Using Hydrophilic Carbon Nanotube Sponge

Xinming Wang, Jing Zhong, Yubo Sun

doi:10.1016/j.compositesb.2025.112447

利用亲水性碳纳米管海绵降低碱渣自缩水率的创新策略

Alkali-activated slag (AAS) cement is recognized as a sustainable alternative to Portland cement (PC) binders. However, its practical application in construction is hindered by significant autogenous shrinkage. This study presents an innovative internal curing strategy by incorporating a hydrophilic carbon nanotube sponge (H-CNTSP) into the AAS paste. Due to the high stiffness of the CNT framework, H-CNTSP exhibits remarkable absorption capacities for activator and pore solution, reaching 74 g/g and 67 g/g, respectively—236% higher than that of conventional superabsorbent polymer (SAP). The addition of just 0.08 wt.% H-CNTSP effectively reduces autogenous shrinkage by 71%, attributed to the sustained liquid release, as confirmed by the monitoring of internal relative humidity. Moreover, the loss in mechanical properties typically associated with internal curing agents is significantly minimized, thanks to the formation of a CNT/reaction product nanocomposite layer with enhanced stiffness. This study offers a promising solution to address the limitations of the AAS system, paving the way for its broader implementation in engineering applications.

碱活性矿渣（AAS）水泥被认为是波特兰水泥（PC）粘合剂的可持续替代品。然而，其在建筑中的实际应用受到显著的自收缩的阻碍。本研究提出了一种创新的内部固化策略，将亲水性碳纳米管海绵（H-CNTSP）掺入AAS浆料中。由于碳纳米管骨架的高刚度，H-CNTSP对活化剂和孔隙溶液的吸收能力显著提高，分别达到74 g/g和67 g/g，比传统的高吸水性聚合物（SAP）提高了236%。由于持续的液体释放，仅添加0.08 wt.%的H-CNTSP有效地减少了71%的自缩水率，正如内部相对湿度监测所证实的那样。此外，由于碳纳米管/反应产物纳米复合层的形成具有增强的刚度，机械性能的损失通常与内部固化剂相关，这大大减少了。这项研究为解决AAS系统的局限性提供了一个有希望的解决方案，为其在工程应用中的更广泛实施铺平了道路。