【新文速递】2023年11月8日复合材料SCI期刊最新文章

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今日更新：Composite Structures 1 篇，Composites Part A: Applied Science and Manufacturing 2 篇，Composites Science and Technology 1 篇

Composite Structures

Preparation of microscale multi-layered viscoelastic polymers and analysis of their noise control effects on composite structures

ZHANG Jie, YAO Dan, QIN Chao, WANG Ruiqian, LI Jiang, GUO Shaoyun

doi:10.1016/j.compstruct.2023.117702

制备微尺度多层粘弹性聚合物并分析其对复合结构的噪声控制效果

Multi-layered design is an effective method to improve the damping performance of structures. The existing research focuses more on the multi-layered design of the structure from the macro-perspective, but lacks attention to the material itself from the micro-perspective. Thus, whether microscale multi-layered (MML) viscoelastic polymers have advantages in damping performance is not clear. Moreover, damping materials preparation and structural noise control is an interdisciplinary study. The noise and vibration control effect of MML viscoelastic polymers in actual composite structures needs to be further investigated. This paper conducts such a study on these issues. First, two different types of MML viscoelastic polymers, i.e., free damping (FD) and micro-constrained damping (MCD) composites, were prepared, and their material properties were characterized. Second, the frequency-dependent damping loss factors and elastic modulus of the different damping composites were identified. The influences of damping composite types and MML designs on material damping loss factor and elastic modulus were compared. Third, a prediction model of vibroacoustic behaviours of the honeycomb sandwich structure was established and validated to investigate the noise and vibration control effects of the MML damping composites on composite structures. The influences of the types, numbers of layers and application positions of the MML damping composites on the honeycomb sandwich structure were studied. The results indicated that MML design is helpful to improve the damping performance of viscoelastic polymers, but its influence on different damping composites is quite different. For noise control, MML-FD is more suitable for controlling airborne sound propagation, while MML-MCD is more suitable for controlling structural sound propagation.

多层设计是提高结构阻尼性能的有效方法。现有研究更多地从宏观角度关注结构的多层设计，而缺乏从微观角度对材料本身的关注。因此，微尺度多层（MML）粘弹性聚合物在阻尼性能方面是否具有优势尚不明确。此外，阻尼材料制备和结构噪声控制是一门交叉学科。MML 粘弹性聚合物在实际复合材料结构中的噪声和振动控制效果有待进一步研究。本文就这些问题进行了研究。首先，制备了两种不同类型的 MML 粘弹性聚合物，即自由阻尼 (FD) 和微约束阻尼 (MCD) 复合材料，并对其材料特性进行了表征。其次，确定了不同阻尼复合材料随频率变化的阻尼损失因子和弹性模量。比较了阻尼复合材料类型和 MML 设计对材料阻尼损失因子和弹性模量的影响。第三，建立并验证了蜂窝夹层结构的振动声学行为预测模型，以研究 MML 阻尼复合材料对复合结构的噪声和振动控制效果。研究了 MML 阻尼复合材料的类型、层数和应用位置对蜂窝夹层结构的影响。结果表明，MML 设计有助于提高粘弹性聚合物的阻尼性能，但其对不同阻尼复合材料的影响却大不相同。在噪声控制方面，MML-FD 更适合控制空气声传播，而 MML-MCD 更适合控制结构声传播。

Composites Part A: Applied Science and Manufacturing

Synergistic effects of periodic weak spark and spatial electric field for one-step dispersion of carbon-based micro/nanomaterial agglomerates

Tian Yu, Li Shuran, Li Mengze, Fu Yihan, Zhu Weidong, Yan Keping, Ke Yinglin

doi:10.1016/j.compositesa.2023.107882

周期性弱电火花和空间电场对一步法分散碳基微/纳米材料团聚体的协同效应

Agglomeration and entanglement pose significant challenges in carbon-based micro/nanomaterials application, hindering the complete expression and fine-tuning of individual properties. A universal spatiotemporal electrified (STE) approach is proposed, which enables the efficient separation of individual constituents from agglomerates, achieving one-step dispersion in the gas phase. This process operates through two features: (1) periodic weak spark loosening and (2) spatial electric field attraction. The periodic weak spark, self-induced and automatically triggered by the material, generates induced electromagnetic fields and shock waves that facilitate repulsion, propulsion, and loosening of the agglomerate structure, endowing the material with capability to overcome the high frictional barriers. Simultaneously, the constructed spatial electric field continuously attracts, selectively separating and outputting individual micro/nanomaterials in real-time. This results in a one-step, concise dispersion process with additional benefits like alignment and blending. Overall, the STE approach has broad applicability and potential to unlock the full capabilities of micro/nanomaterials in various applications.

团聚和缠结给碳基微型/纳米材料的应用带来了巨大挑战，阻碍了单个特性的完整表达和微调。本文提出了一种通用的时空电动化（STE）方法，它能有效地将单个成分从团聚体中分离出来，在气相中实现一步分散。该工艺有两个特点：(1) 周期性弱火花松动和 (2) 空间电场吸引。周期性弱火花由材料自发触发，产生感应电磁场和冲击波，促进团聚结构的排斥、推进和松散，赋予材料克服高摩擦障碍的能力。同时，构建的空间电场不断吸引、选择性分离和实时输出单个微/纳米材料。这样，分散过程一步到位，简洁明了，还具有对齐和混合等额外优势。总之，STE 方法具有广泛的适用性和潜力，可在各种应用中释放微/纳米材料的全部能力。

Improved Pyroelectric Performances of Functionally Graded Graphene Nanoplatelet Reinforced Polyvinylidene Fluoride Composites: Experiment and Modelling

Zeng Bowen, Yang Jinlong, Ni Zhi, Fan Yucheng, Hang Ziyan, Feng Chuang

doi:10.1016/j.compositesa.2023.107883

功能分级石墨烯纳米板增强聚偏氟乙烯复合材料的热电性能改进：实验与建模

Polyvinylidene fluoride (PVDF), as a pyroelectric polymer, has great potential applications in electronic devices and sensors. However, the low pyroelectric properties of pure PVDF limit its application. In this work, functionally graded graphene nanoplatelet (FG-GNP) reinforced PVDF composite films are prepared and test for their pyroelectric performance. Apart from experiments, the pyroelectric properties of the films are modelled and analyzed by finite element analysis (FEA), which is verified by the experiments as conducted. It demonstrates that the pyroelectric properties of FG-GNP/PVDF composite films are significantly improved compared to the homogeneous GNP/PVDF composite counterparts. It is found that for the same thickness and amount of GNP added, the increase in the number of layers leads to enhanced pyroelectric properties of the composite films. When the GNP concentration of the layer closed to the surfaces of the FG-GNP/PVDF composite film is higher, the pyroelectric properties and temperature stability of the film are more favorable.

聚偏二氟乙烯（PVDF）作为一种热释电聚合物，在电子设备和传感器领域有着巨大的应用潜力。然而，纯 PVDF 的热释电特性较低，限制了其应用。本研究制备了功能分级石墨烯纳米板（FG-GNP）增强 PVDF 复合薄膜，并对其热释电性能进行了测试。除实验外，还通过有限元分析（FEA）对薄膜的热释电特性进行了建模和分析，并通过实验进行了验证。结果表明，与同质的 GNP/PVDF 复合材料相比，FG-GNP/PVDF 复合薄膜的热电性能得到了显著改善。研究发现，在相同厚度和 GNP 添加量的情况下，层数的增加会增强复合薄膜的热释电特性。当 FG-GNP/PVDF 复合薄膜表面封闭层的 GNP 浓度越高时，薄膜的热释电特性和温度稳定性越好。

Composites Science and Technology

Self-healing and in-situ real-time damage-reporting fiber-reinforced composite

Yuan Weihao, Zhang Ziyang, Li Yueshan, Huang Yudong, Zhong Zhengxiang, Hu Zhen

doi:10.1016/j.compscitech.2023.110344

自愈合和原位实时损伤报告纤维增强复合材料

To increase the service life of composite materials, self-healing, and damage detection are essential. Although a lot of research has been done on self-healing and damage-reporting materials, it is still difficult to combine self-healing with in-situ and real-time damage detection in bulk resin and composites. By integrating extrinsic self-healing based on microcapsules and internal self-healing based on coordination interaction, the simultaneous self-healing of matrix and interface damage of fiber-reinforced composites was achieved in this study. Specifically, two-component microcapsules filled with epoxy/mercaptan repair agent were inserted into the matrix and Ag nanoparticles (AgNPs) were introduced into the surface of carbon fiber by electroless plating. Upon the rupture of microcapsules, matrix self-healing was used to reach a desirable level of synchronous healing efficiency. In the meantime, the excess sulfhydryl reacted with AgNPs on the fibers to establish a coordination bond for interface self-healing. More intriguingly, the high exothermic action of epoxy resin and mercaptan repair agent in the self-healing process was observed when using infrared thermal imaging technology for in-situ and real-time damage detection.

为了提高复合材料的使用寿命，自修复和损伤检测是必不可少的。尽管人们对自修复和损伤报告材料进行了大量研究，但仍难以将大块树脂和复合材料的自修复与原位实时损伤检测结合起来。本研究通过整合基于微胶囊的外在自修复和基于配位相互作用的内在自修复，实现了纤维增强复合材料基体和界面损伤的同步自修复。具体来说，将填充有环氧树脂/硫醇修复剂的双组分微胶囊插入基体中，并通过无电解电镀将银纳米粒子（AgNPs）引入碳纤维表面。微胶囊破裂后，基质自愈合可达到理想的同步愈合效率。同时，多余的巯基与纤维上的 AgNPs 发生反应，建立配位键，实现界面自愈合。更有趣的是，利用红外热成像技术进行原位和实时损伤检测时，观察到环氧树脂和硫醇修复剂在自愈合过程中的高放热作用。

来源：复合材料力学仿真Composites FEM

【新文速递】2023年11月11日固体力学SCI期刊最新文章

今日更新：International Journal of Solids and Structures 1 篇，Mechanics of Materials 1 篇，Thin-Walled Structures 2 篇International Journal of Solids and StructuresMulti-scale numerical simulation of fracture behavior for the gadolinia-doped ceria (GDC) under mechano-electrochemical coupling fields at high temperatureHuang Runze, Sun Yi, Yang Zhiqiangdoi:10.1016/j.ijsolstr.2023.112564高温机械-电化学耦合场下钆掺杂陶瓷（GDC）断裂行为的多尺度数值模拟The fracture toughness of gadolinia-doped ceria (GDC) solid oxide fuel cells (SOFCs) electrolyte with a central crack is significantly reduced under the mechano-electrochemical coupling fields at high temperature. In this work, an atom-to-continuum (AtC) multi-scale method combining the finite element method (FEM) and the molecular dynamics (MD) simulation is developed. Firstly, the AtC multi-scale method is validated by investigating the uniaxial tensile stress-strain curves of GDC with a central crack at different temperatures. Then, based on the theory of fracture mechanics, the macrostructure of GDC is transformed into a microscopic intermediate transition model, and a detailed computational procedure for analyzing the fracture toughness of the macrostructure of the GDC is given by the AtC multi-scale method. Finally, the fracture toughness of GDC macrostructure under the mechano-electrochemical coupling fields is studied by the proposed approach. The simulation results show that the fracture toughness of 10GDC and 20GDC under the mechano-electrochemical coupling fields is clearly reduced compared to the uniaxial tensile loading. Among them, the fracture toughness of 10GDC under the mechano-electrochemical coupling fields is decreased by 12.28% and 30.67% at 800℃ and 900℃, and the fracture toughness of 20GDC under the mechano-electrochemical coupling fields is decreased by 17.25% and 29.52% at 800℃ and 900℃. These findings are critical in predicting the fracture behavior of GDC electrolyte under real working conditions.钆掺杂铈（GDC）固体氧化物燃料电池（SOFCs）电解质在高温机械-电化学耦合场作用下，中心裂纹的断裂韧性显著降低。本研究开发了一种结合有限元法（FEM）和分子动力学（MD）模拟的原子到连续（AtC）多尺度方法。首先，通过研究带有中心裂纹的 GDC 在不同温度下的单轴拉伸应力-应变曲线，验证了 AtC 多尺度方法。然后，基于断裂力学理论，将 GDC 的宏观结构转化为微观中间过渡模型，并通过 AtC 多尺度方法给出了分析 GDC 宏观结构断裂韧性的详细计算程序。最后，利用所提出的方法研究了机械-电化学耦合场下 GDC 宏观结构的断裂韧性。模拟结果表明，与单轴拉伸加载相比，10GDC 和 20GDC 在机械电化学耦合场下的断裂韧性明显降低。其中，10GDC在机械电化学耦合场下的断裂韧性在800℃和900℃时分别降低了12.28%和30.67%，20GDC在机械电化学耦合场下的断裂韧性在800℃和900℃时分别降低了17.25%和29.52%。这些发现对于预测 GDC 电解液在实际工作条件下的断裂行为至关重要。Mechanics of MaterialsThe viscoelastic behavior of lignin: Quantification through nanoindentation relaxation testing on hot-pressed technical lignin samples from various originsSchwaighofer Michael, Königsberger Markus, Zelaya-Lainez Luis, Lukacevic Markus, Serna-Loaiza Sebastián, Harasek Michael, Zikeli Florian, Friedl Anton, Füssl Josefdoi:10.1016/j.mechmat.2023.104864 木质素的粘弹性行为：通过对不同产地的热压工业木质素样品进行纳米压痕松弛测试进行量化Lignin, the second most abundant organic polymer on earth, is one of the primary causes of the viscoelastic behavior of plants. An accurate characterization of its viscoelastic properties is essential for predicting the time-dependent response of natural materials, including wood and plant fibers, and for advancing lignin-based materials and their production methods, such as 3D printing of biocomposites. To enrich the still rather sparse knowledge on the viscoelasticity of lignin, we re-evaluate nanoindentation relaxation tests performed on five hot-pressed technical lignins extracted from different feedstocks, using three different extraction methods. The viscoelastic indentation problem is addressed using the method of functional equations combined with the homogenization theory to account for the production-induced porosity. This evaluation procedure allows for quantitatively assessing the viscoelastic properties of lignin, which can be very accurately described by an isochoric four-parameter Burgers model. Remarkably, the viscoelastic properties of all tested lignins are practically identical and independent of the feedstock and the extraction processes.木质素是地球上含量第二高的有机聚合物，是植物粘弹性行为的主要成因之一。准确描述木质素的粘弹性能对于预测木材和植物纤维等天然材料随时间变化的响应，以及推进木质素基材料及其生产方法（如生物复合材料的三维打印）至关重要。为了丰富有关木质素粘弹性的知识，我们采用三种不同的提取方法，对从不同原料中提取的五种热压工业木质素进行了纳米压痕松弛测试。粘弹性压痕问题采用函数方程法结合均质化理论来解决，以考虑生产引起的孔隙率。该评估程序可定量评估木质素的粘弹性能，并可通过等速四参数伯格斯模型对其进行非常精确的描述。值得注意的是，所有受测木质素的粘弹性能几乎完全相同，且不受原料和提取工艺的影响。Thin-Walled StructuresSeismic Performance of Weak-Beam-Type Steel Low-to-Middle-Rise Moment-Resisting Frame Determined by Local Buckling of Square Hollow Section ColumnsYamada Satoshi, Miyazawa Hiroki, Iyama Jundoi:10.1016/j.tws.2023.111359通过方形空心截面柱的局部屈曲确定弱梁型钢中低层力矩支撑框架的抗震性能This study performed incremental dynamic analyses to investigate the relationship between the seismic performance and deformation capacity of the column of weak-beam-type steel moment-resisting frames (MRFs) with square hollow section (SHS) columns. A hysteresis model that accurately simulates the local buckling cyclic behavior was used for the analysis. From analytical results, a relationship between the required strength of the weak-beam-type steel MRFs and the width-to-thickness ratio of the SHS columns was obtained. Also, safety margin of MRFs up to collapse was evaluated in the relationship with the width-to-thickness ratio of the SHS column.本研究进行了增量动态分析，以研究采用方形空心截面（SHS）柱的弱梁型钢力矩抵抗框架（MRF）的抗震性能与柱变形能力之间的关系。分析中使用了能精确模拟局部屈曲循环行为的滞后模型。根据分析结果，得出了弱梁型钢 MRF 所需强度与 SHS 柱宽厚比之间的关系。此外，还评估了 MRF 在坍塌前的安全裕度与 SHS 柱的宽厚比之间的关系。High-fidelity prediction and temperature-rise mechanism for low-velocity impact of triaxially braided compositesLiu Peng, Cai Yinglong, Zhao Zhenqiang, Zhang Chaodoi:10.1016/j.tws.2023.111360 三轴编织复合材料低速冲击的高保真预测和温升机制An elastoplastic mechanical-thermal constitutive model was integrated into the development of a mesoscale finite element model. This model aimed to analyze the temperature rise phenomenon and failure behavior of composites under impact loading conditions. Triaxially braided carbon/epoxy composite specimens were subjected to low-velocity impact using a drop weight tester, and the temperature variations within the specimens were monitored using an infrared camera. The numerical predictions successfully reproduced the observed failure modes and accurately captured the temperature distribution. A numerical study was performed to explore the main factors of temperature rise, indicating that plastic work of pure matrix and fracture transformed energy of fiber tow are the primary sources of temperature rise. The transverse specimen was found to exhibit superior energy absorption capacity under high-energy impacts.在中尺度有限元模型的开发过程中集成了弹塑性机械-热构成模型。该模型旨在分析复合材料在冲击加载条件下的温升现象和破坏行为。使用落锤试验机对三轴向编织碳/环氧复合材料试样进行低速冲击，并使用红外摄像机监测试样内部的温度变化。数值预测成功地再现了观察到的失效模式，并准确捕捉到了温度分布。数值研究探讨了温升的主要因素，表明纯基体的塑性功和纤维束的断裂转化能是温升的主要来源。研究发现，横向试样在高能冲击下表现出卓越的能量吸收能力。来源：复合材料力学仿真Composites FEM