【新文速递】2025年3月12日复合材料SCI期刊最新文章_ACT_Mechanical_Additive

【新文速递】2025年3月6日复合材料SCI期刊最新文章

今日更新：Composite Structures 3 篇，Composites Part A: Applied Science and Manufacturing 3 篇，Composites Part B: Engineering 6 篇，Composites Science and Technology 1 篇Composite StructuresA micromechanical model for the determination of nonlinear coupled electro-magneto-thermo-elastic effects on magnetoelectric compositesZiwei Li, Junjie Ye, Lu Liu, Yiwei Wang, Yang Li, Yang Shi, Dianzi Liudoi:10.1016/j.compstruct.2025.119017磁电复合材料非线性耦合电-磁-热弹性效应的微观力学模型Magnetoelectric (ME) composites composed of piezoelectric and magnetostrictive materials have excellent energy conversion properties. In this paper, a novel micromechanical modeling framework is proposed to study the effective material properties and nonlinear electro-magneto-elastic behaviors of magnetoelectric composites under multiple physical fields. Initially, a fully coupled nonlinear electro-magneto-thermo-elastic constitutive relationship is established. Based on finite volume direct averaging micromechanics (FVDAM), the local stress, electric displacement and magnetic flux density distribution of discrete elements are obtained by constructing the generalized local stiffness matrix and assembling the global stiffness matrix. The equivalent material coefficients of the magnetoelectric composite are obtained by employing the homogenization technique. Results of the numerical model are compared with different discrete elements and experimental data to verify the convergence and effectiveness of the developed algorithm. Moreover, effects of external prestress, ambient temperature, microscopic structure and applied magnetic field intensity on material properties such as magnetoelectric and piezomagnetic coefficients are investigated. Finally, the influences of initial damage and constituent phase volume fraction on the equivalent material coefficient and local mechanical response are discussed. The promising results provide a solid foundation for theoretical study and useful insight into the optimal design of high-performance ME composites.由压电材料和磁致伸缩材料组成的磁电复合材料具有优异的能量转换性能。本文提出了一种新的微力学建模框架，用于研究多物理场作用下磁电复合材料的有效材料性能和非线性电磁弹性行为。首先建立了完全耦合的非线性电磁-热弹性本构关系。基于有限体积直接平均细观力学（FVDAM），通过构造广义局部刚度矩阵和组合全局刚度矩阵，得到离散单元的局部应力、电位移和磁通密度分布。采用均质化技术得到了磁电复合材料的等效材料系数。将数值模型的计算结果与不同离散单元和实验数据进行了比较，验证了算法的收敛性和有效性。此外，还研究了外部预应力、环境温度、微观结构和外加磁场强度对材料磁电系数和压磁系数等性能的影响。最后讨论了初始损伤和组成相体积分数对等效材料系数和局部力学响应的影响。研究结果为高性能ME复合材料的理论研究和优化设计提供了坚实的基础。Constitutive model for nonlinear anisotropic swelling and self-growing of polymers and gelsGuangzheng Lv, Yunlong Li, Haohui Zhangdoi:10.1016/j.compstruct.2025.119020聚合物和凝胶非线性各向异性膨胀和自生长的本构模型Due to exceptional swelling properties, gel polymers can form shape-deforming structures, rendering them suitable for applications. Research on dynamic polymers and polymer gels has developed several novel mechanisms beyond the swelling mechanism. These novel mechanisms also enable dynamic polymers to undergo shape transformations over time within a solution environment. Specifically, under certain environmental conditions, monomer solutions can undergo monomer insertion and facilitate the formation of new polymer chains. This process endows the polymer gel network with self-growing characteristics, making it better suited to meet the demands of applications in engineering. Introducing anisotropy into hydrogels makes it possible to meet the demands for non-uniform deformation of polymer gel structures in many scenarios, thereby facilitating the programmable anisotropic swelling. Although the potential applications of these technologies are extensive, many aspects of the self-growth and swelling deformation behaviors in anisotropic polymer gels remain underexplored. A micro-theoretical investigation into the self-growth process of fiber-reinforced polymer gels is proposed. The embedding of fibers within the growable polymer matrix is shown to guide the material toward exhibiting overall anisotropic behavior. To describe this response in detail, a constitutive model for self-growing fiber-reinforced polymer gels was developed and implemented through numerical simulations, which provides a theoretical foundation for predicting the complex deformation behaviors of anisotropic biomaterials.由于特殊的膨胀特性，凝胶聚合物可以形成形状变形结构，使其适合应用。动态聚合物和聚合物凝胶的研究已经发展出一些新的机制。这些新机制还使动态聚合物能够在溶液环境中随时间发生形状变化。具体来说，在一定的环境条件下，单体溶液可以进行单体插入，促进新的聚合物链的形成。这一过程使聚合物凝胶网络具有自生长特性，使其更适合于工程应用的要求。在水凝胶中引入各向异性，可以满足聚合物凝胶结构在许多情况下的非均匀变形需求，从而促进可编程的各向异性膨胀。尽管这些技术的潜在应用非常广泛，但各向异性聚合物凝胶中自生长和膨胀变形行为的许多方面仍未得到充分研究。对纤维增强聚合物凝胶的自生长过程进行了微观理论研究。在可生长的聚合物基体中嵌入纤维可以引导材料表现出整体的各向异性行为。为了详细描述这种响应，通过数值模拟建立了自生长纤维增强聚合物凝胶的本构模型，为预测各向异性生物材料的复杂变形行为提供了理论基础。A novel method for constructing 3D void RVE elements and rapid homogenization of composite materialsXiangxi Li, Mengze Li, Fengyi Zhang, Fanrui Kong, Di Yang, Weiwei Qu, Yinglin Kedoi:10.1016/j.compstruct.2025.119040一种构建三维孔隙RVE单元及复合材料快速均匀化的新方法This article provides a method for modeling large-scale three-dimensional (3D) void defect Representative Volume Elements (RVE) with high fiber volume fractions and performing rapid homogenization. A 3D multi-section void construction method based on the Ferguson curve is proposed, along with an “inertia algorithm” that obtains optimal fiber positioning by minimizing overall inertia, taking the influence of void positioning into account. This method enables the rapid generation of 3D void defect RVE models with high fiber volume fractions. A model simplification and rapid homogenization method based on a multi-scale approach is proposed, in which the RVE containing void defects is treated as a mesoscopic structure with fiber-resin and void regions considered as two microcosmic structures. The fiber-resin region is regarded as a new material, simplifying the initial fiber-resin-void three-phase model into a two-phase model of the new material and voids. The simplified model has only 9.2% of the initial mesh elements and a homogenization time of 6.7%, achieving rapid homogenization. The rapid homogenization method was validated using two existing void RVE models, revealing an accuracy of over 95% for the obtained elastic constants.本文提供了一种模拟具有高纤维体积分数的大尺度三维（3D）孔隙缺陷的代表性体积元（RVE）并进行快速均质化的方法。提出了一种基于Ferguson曲线的三维多段孔洞构造方法，并提出了一种考虑孔洞定位影响的“惯性算法”，通过最小化整体惯性来获得最优的纤维定位。该方法能够快速生成具有高纤维体积分数的三维孔隙缺陷RVE模型。提出了一种基于多尺度方法的模型简化和快速均质方法，该方法将含有孔洞缺陷的RVE视为一种介观结构，将纤维-树脂和孔洞区域视为两种微观结构。将纤维-树脂区域视为一种新材料，将初始纤维-树脂-空隙三相模型简化为新材料-空隙两相模型。简化模型的网格单元数仅为初始的9.2%，均匀化时间为6.7%，实现了快速均匀化。使用两种现有的孔隙RVE模型验证了快速均匀化方法，结果表明，得到的弹性常数精度超过95%。Composites Part A: Applied Science and ManufacturingNew flexible 3D POSS-based COF simultaneously strengthens and toughens epoxy resin (EP) at extreme temperaturesRunze Jin, Yijie Zhang, Donghui Guo, Zhiliang Zhou, Lijie Qu, Baosheng Xudoi:10.1016/j.compositesa.2025.108846新型柔性3D基于poss的COF在极端温度下同时增强和增韧环氧树脂（EP）This study introduces a novel approach by designing a flexible three-dimensional Covalent Organic Framework (COFs), specifically NH2-POSS-COF, which serves as a uniform cross-linking site within the EP system. This framework provides substantial internal free volume and mitigates stress concentrations by enabling effective energy dissipation during mechanical loading. The research demonstrates that the integration of NH2-POSS-COF significantly enhances the fracture toughness and tensile strength of EP at both RT and cryogenic. These findings open new avenues for optimizing EP performance in low-temperature applications, contributing to the development of high-performance composite materials for aerospace missions.本研究通过设计一个灵活的三维共价有机框架（COFs），特别是NH2-POSS-COF，在EP系统中作为统一的交联位点，引入了一种新的方法。该框架提供了大量的内部自由体积，并通过在机械加载期间实现有效的能量耗散来减轻应力集中。研究表明，NH2-POSS-COF的掺入显著提高了EP在室温和低温下的断裂韧性和拉伸强度。这些发现为优化低温应用中的EP性能开辟了新的途径，有助于开发用于航空航天任务的高性能复合材料。Synergistic strengthening of copper matrix composites with carbides of different aspect ratiosXinglin Gao, Jun Li, Zhang Liu, Qianying Guo, Yuan Huang, Zumin Wangdoi:10.1016/j.compositesa.2025.108848铜基复合材料与不同长径比碳化物的协同强化Copper matrix composites, known for their high strength, derive their desirable mechanical properties from strengthening effects of reinforcement. However, a single reinforcement provides a limitation of improvement in strength at the expense of plasticity. A strategy of synergistic improvement of strength and plasticity has been developed by incorporating two reinforcements with different aspect ratios. To this end, WC nanoparticles and SiC whiskers-reinforced copper matrix composites (WCp-SiCw/Cu) were prepared by intermittent pulsed electrodeposition and spark plasma sintering. These composites are designed with a unique core-shell structure, and thereby the agglomeration of reinforcements can be effectively avoided during sintering. As a result, the yield strength (323 MPa) of the WCp-SiCw/Cu is about double that of pure copper, while maintaining a high uniform elongation (15.3 %). The synergistic strengthening of the composites arises from the complementary advantages of the SiCw(s) and WCp(s). The results provide a promising route to preparing composites with comprehensive mechanical properties.铜基复合材料以其高强度而闻名，其理想的机械性能来源于增强剂的强化作用。然而，单一的钢筋提供了有限的提高强度，以牺牲塑性。通过采用两种不同长径比的增强材料，开发了一种协同提高强度和塑性的策略。为此，采用间歇脉冲电沉积和火花等离子烧结法制备了WC纳米颗粒和SiC晶须增强铜基复合材料（WCp-SiCw/Cu）。复合材料采用独特的核壳结构，有效避免了烧结过程中增强材料的团聚现象。结果表明，WCp-SiCw/Cu的屈服强度（323 MPa）约为纯铜的两倍，同时保持了较高的均匀伸长率（15.3 %）。复合材料的协同强化源于SiCw(s)和WCp(s)的互补优势。研究结果为制备具有综合力学性能的复合材料提供了一条有前途的途径。Multi-mode triggered bio-based epoxy resin/lauric acid/graphene paper flexible phase change materials with high enthalpy value, multi-functionality, and personal thermal management abilityYanyun Li, Tiancheng Wang, Junying Zhang, Jue Cheng, Qingsong Liandoi:10.1016/j.compositesa.2025.108849多模式触发生物基环氧树脂/月桂酸/石墨烯纸柔性相变材料，具有高焓值、多功能、个人热管理能力In recent years, thermal management technology based on phase change materials (PCMs) has provided a new solution for the development of wearable thermal management systems. However, because the high enthalpy value, flexibility, and multi-functional integration of PCMs are mutually restricted, most of the reported wearable thermal management materials cannot achieve the synergic development of flexibility at room temperature, multi-functionality, and heat storage capacity of PCMs. In this paper, a new type of flexible PCMs was prepared by using bio-based modified eugenol epoxy resin and lauric acid. It is worth noting that due to the flexibility of the epoxy network itself and its excellent compatibility with La, the final PCMs exhibit high encapsulation rate (80 wt%) and high enthalpy value (163.3 J/g). Finally, the PCMs were combined with graphene paper to prepare a composite film, which has excellent thermal conductivity (3.28 Wm−1 K−1), electromagnetic interference shielding property (42 dB), solar-thermal (86.7 %, 1000 W/m2), and electro-thermal (89.3 %, 3.0 V) conversion and storage capabilities. Besides, the composite film not only has good flexibility at room temperature, but also shows excellent multi-mode shape memory performances. Last but not least, the composite film has great application potential in the field of wearable thermal therapy equipment.近年来，基于相变材料（PCMs）的热管理技术为可穿戴热管理系统的发展提供了新的解决方案。然而，由于pcm的高焓值、柔韧性和多功能集成化三者相互制约，目前报道的可穿戴热管理材料大多无法实现pcm室温柔韧性、多功能和蓄热能力的协同发展。本文以生物基改性丁香酚环氧树脂和月桂酸为原料，制备了一种新型柔性PCMs。值得注意的是，由于环氧树脂网络本身的柔韧性及其与La的良好相容性，最终的pcm具有高包封率（80 wt%）和高焓值（163.3 J/g）。最后，将pcm与石墨烯纸结合，制备出具有优异导热系数（3.28 Wm−1 K−1）、屏蔽电磁干扰性能（42 dB）、光热（86.7 %,1000 W/m2）、电热（89.3% %,3.0 V）转换和存储能力的复合薄膜。此外，复合薄膜不仅在室温下具有良好的柔韧性，而且表现出优异的多模形状记忆性能。最后，该复合薄膜在可穿戴式热疗设备领域具有很大的应用潜力。Composites Part B: EngineeringScale dependent effects on the fatigue response of woven textile compositesEugene Kheng, Royan D’Mello, Anthony Waasdoi:10.1016/j.compositesb.2025.112341纺织机织复合材料疲劳响应的尺度依赖效应The tensile fatigue response of notched twill textile composites is studied in this investigation. The goal is to evaluate the effect of a notch of fixed size and its placement (with respect to the textile’s mesostructure), on the tensile fatigue response, thereby showing that scale effects are important in understanding and explaining the obtained experimental results. Load-controlled fatigue experiments, supplemented with the Digital Image Correlation (DIC) technique to monitor strains, are conducted. A finite element based fatigue damage model is presented to model matrix degradation and the fatigue response of the twill textile composite. Based on the experimental results, we can distinguish between two types of fatigue response - fatigue resistant (FR) and fatigue susceptible (FS). Because the size of the notch is comparable to the characteristic geometric length scales of the mesostructure, its placement with respect to the mesostructure affects the overall damage evolution and fatigue life across these two families of specimens. The finite element model is shown to reproduce the key features observed in the experiments.研究了缺口斜纹纺织复合材料的拉伸疲劳响应。目的是评估固定尺寸缺口及其放置（相对于纺织品的细观结构）对拉伸疲劳响应的影响，从而表明尺度效应在理解和解释获得的实验结果方面是重要的。采用数字图像相关（DIC）技术监测应变，进行了载荷控制疲劳试验。提出了一种基于有限元的疲劳损伤模型来模拟斜纹织物复合材料的基体退化和疲劳响应。根据试验结果，我们可以区分疲劳响应的两种类型——疲劳抵抗（FR）和疲劳敏感（FS）。由于缺口的尺寸与细观结构的特征几何长度尺度相当，因此缺口相对于细观结构的位置影响了这两类试件的整体损伤演变和疲劳寿命。该有限元模型能够再现实验中观察到的关键特征。Temperature-sensitive dual-matrix composite ink for ultrahigh-density and large-scale flexible temperature microsensor arrayZiyi Gong, Bin Tian, Ke Zheng, Weinan Tang, Xiao Chen, Quancai Li, Bo Wen, Wei Wudoi:10.1016/j.compositesb.2025.112357 用于超高密度和大规模柔性温度微传感器阵列的温度敏感双基复合油墨Flexible temperature sensor arrays (FTSAs) are critical in applications such as biomedical monitoring and environmental assessment due to their capacity to capture local temperature changes. However, developing FTSAs with high sensitivity, high sensing density, and large scalability remains a daunting challenge. Herein, a novel composite ink with a dual polymer matrix that facilitates the fabrication of high-performance flexible temperature sensors is developed. Taking the advantage of screen-printing technology, flexible temperature sensors with a minimum side length of 500 μm are fabricated. Furthermore, a ultrahigh-density and large-scale FTSA with up to 2500 units (50×50) is developed, accompanied by a real-time data acquisition system to achieve heat source localization and thermal imaging. Within the temperature range of 25 - 40 °C, the sensor demonstrates the highest temperature coefficient of resistance of 14.4%/°C, excellent resolution of 0.1 °C, superior thermal cycling stability (1000 cycles), and insensitivity to additional stimuli such as bending and humidity, demonstrating applications in respiratory monitoring and temperature monitoring. These results provide a novel idea for temperature monitoring in applications such as pet temperature monitoring, electronic skin (e-skin) and smart skin for aircraft.柔性温度传感器阵列（ftsa）由于其捕获局部温度变化的能力，在生物医学监测和环境评估等应用中至关重要。然而，开发具有高灵敏度、高传感密度和大可扩展性的ftsa仍然是一个艰巨的挑战。本文开发了一种新型的双聚合物基复合墨水，用于制造高性能柔性温度传感器。利用丝网印刷技术，制作了最小边长为500 μm的柔性温度传感器。此外，开发了高达2500个单元的超高密度大规模FTSA (50×50)，并配有实时数据采集系统，以实现热源定位和热成像。在25 - 40°C的温度范围内，该传感器显示出14.4%/°C的最高温度电阻系数，0.1°C的出色分辨率，卓越的热循环稳定性（1000循环），以及对弯曲和湿度等额外刺激的不敏感，证明了在呼吸监测和温度监测中的应用。这些结果为宠物温度监测、电子皮肤（e-skin）和飞机智能皮肤等应用的温度监测提供了一种新的思路。Overcoming the Uniform Heat Transfer Network Construction Trade-off in Anchored Structure Composites with Electromagnetic ShieldingRui Chen, Yageng Bai, Yuxuan Gu, Yifan Wang, Yashu He, Yuqing Zou, Xiangxing Zeng, Zetong Ma, Cheng Wang, Jianxin Mu, Xudong Chendoi:10.1016/j.compositesb.2025.112359电磁屏蔽锚定结构复合材料中均匀换热网络构建问题的解决The development of high-performance thermal conductivity (TC) and electromagnetic interference (EMI) shielding composites is crucial in advancing technologies like AI and 5G, as these materials are key to managing heat and protecting against EMI in modern electronic devices. In this work, we present an anchored structure polyetheretherketone (PEEK) composite consisting of a lattice structure MWCNTs/PEEK and with a core-shell structure (NH2-GnPs@Ag&MWCNTs)@PBZ/PEEK particles confined within the lattice and fabricated by laminate processing. This unique configuration establishes dual transport pathways for both phonons and electrons, creating a more robust and homogeneous thermal conduction network compared to conventional segregated structures, while maintaining effective charge carrier transport. The anchored structure composites with 14.13% filler content achieved TC optimums of 4.36 W·m-1K-1 in-plane and 2.71 W·m-1K-1 through plane, which are 1178% and 1896% better than those of pure PEEK. The dense anchored structure network, polybenzoxazine (PBZ) interfacial modification, and the heterostructure NH2-GnPs@Ag work synergistically to enhance the efficient transport of phonons and electrons while reducing interfacial thermal resistance (ITR). Furthermore, the anchored structure composites demonstrate outstanding EMI shielding capability (59.05 dB, 14.13%), thermal stability, and thermal management performance. Finite element modeling further confirms that the anchored structure promotes phonon/electron transport and effectively attenuates EMI waves.高性能导热（TC）和电磁干扰（EMI）屏蔽复合材料的开发对于推进人工智能和5G等技术至关重要，因为这些材料是现代电子设备中管理热量和防止EMI的关键。在这项工作中，我们提出了一种锚定结构聚醚醚酮（PEEK）复合材料，该复合材料由晶格结构MWCNTs/PEEK和限制在晶格内的核壳结构（NH2-GnPs@Ag&MWCNTs）@PBZ/PEEK颗粒组成，并通过层压加工制备。这种独特的结构为声子和电子建立了双重传输途径，与传统的分离结构相比，创建了更坚固和均匀的热传导网络，同时保持有效的载流子传输。当填料含量为14.13%时，锚固结构复合材料的TC最优值为面内4.36 W·m-1K-1，透面2.71 W·m-1K-1，分别比纯PEEK提高了1178%和1896%。密集的锚定结构网络、聚苯并恶嗪（PBZ）界面修饰和异质结构NH2-GnPs@Ag协同作用，增强声子和电子的有效传递，同时降低界面热阻（ITR）。此外，锚定结构复合材料具有出色的电磁干扰屏蔽能力（59.05 dB, 14.13%）、热稳定性和热管理性能。有限元模型进一步证实了锚定结构促进声子/电子传递并有效衰减EMI波。From Microsphere Synthesis to Neural Tissue Regeneration: Unraveling the Potentials and ProgressYaqiong Liu, Yuqing Shang, Zhen Wang, Hongxia Gao, Nana Jin, Weihao Zhang, Huoyun Shen, Shaolan Sun, Dongzhi Wang, Zhiwei Wang, Xiaosong Gu, Yumin Yang, Guicai Lidoi:10.1016/j.compositesb.2025.112363从微球合成到神经组织再生：揭示潜力和进展Microspheres have been extensively employed as drug delivery systems within the realm of tissue engineering, owing to their remarkable controlled release capabilities. The inherent properties of microspheres, with respect to size and structure, endow them with the ability to form tiny porous network architectures. These architectures can serve as platforms for the delivery of growth factors, drugs, or nanoscale materials, thereby progressively emerging as fundamental constituents in the fabrication of tissue regeneration scaffolds. In the domain of neural tissue engineering, microspheres represent ideal carriers, as they are capable of furnishing multifactorial cues during nerve tissue repair. Such cues encompass the delivery of chemical signals essential for neuronal communication, the conveyance of biological factors conducive to axon outgrowth, and the responsiveness to physical stimulations. Nevertheless, a comprehensive and systematic work summary regarding the application of microspheres in neural tissue engineering remains scarce. Consequently, in this review, we initially conduct a systematic overview of the preparation methodologies, optimization strategies in terms of smart responsiveness, and characterization techniques of diverse microspheres. Additionally, we further consolidate the application of microsphere-based scaffolds in the remediation of nerve injuries, including traumatic brain injury, spinal cord injury, and peripheral nerve injury. Finally, the challenges and prospective directions pertaining to microspheres in tissue engineering are deliberated. The current work is anticipated to offer valuable references for the advancement of microspheres in the domain of various tissue engineering applications.微球由于其出色的控制释放能力，在组织工程领域被广泛用作药物递送系统。微球在尺寸和结构方面的固有特性赋予了它们形成微小多孔网络结构的能力。这些结构可以作为输送生长因子、药物或纳米级材料的平台，从而逐渐成为组织再生支架制造的基本成分。在神经组织工程领域，微球是理想的载体，因为它们能够在神经组织修复过程中提供多因子线索。这些信号包括神经通讯所必需的化学信号的传递，有利于轴突生长的生物因子的传递，以及对物理刺激的反应。然而，关于微球在神经组织工程中的应用的全面、系统的工作总结仍然很少。因此，在本综述中，我们首先对不同微球的制备方法、智能响应性方面的优化策略和表征技术进行了系统的综述。此外，我们进一步巩固了微球支架在神经损伤修复中的应用，包括创伤性脑损伤、脊髓损伤和周围神经损伤。最后，对微球在组织工程中的应用面临的挑战和发展方向进行了展望。本研究为微球在各种组织工程领域的应用提供了有价值的参考。Mesoscale simulation of C-S-H creep and stress relaxation by discrete element modellingZhe Zhang, Zhongbo Yuan, Guoqing Gengdoi:10.1016/j.compositesb.2025.112360离散单元模拟C-S-H蠕变和应力松弛的中尺度模拟Creep and stress relaxation are time-dependent phenomena that deteriorate concrete structures, primarily occurring in calcium silicate hydrate, the key binder in Portland cement. Evaluating microstructure development during creep is challenging due to long testing durations. This study employs a novel discrete element method to model creep and stress relaxation in C-S-H, enabling microstructure evolution exploration. The simulation results align well with nanoindentation tests, allowing identification of key factors influencing creep. A microstructure-induced machine learning model is developed to describe the relationship between microstructure and creep deformation to assess the importance of various microstructure indices. This study directly verifies the mechanism by which high pressure accelerates the creep in nanoindentation tests. The influence of microstructure indices on creep is quantitatively analyzed, revealing that penetration depth resulting from reduced modulus has the strongest correlation with creep. A detailed analysis of surface forces offers valuable insights for designing experiments and optimizing material properties.蠕变和应力松弛是一种时间依赖性现象，会使混凝土结构恶化，主要发生在水化硅酸钙中，水化硅酸钙是硅酸盐水泥的关键粘结剂。由于测试时间长，评估蠕变过程中的微观结构发展具有挑战性。本研究采用一种新颖的离散元方法来模拟C-S-H的蠕变和应力松弛，从而进行微观结构演化探索。模拟结果与纳米压痕试验结果吻合较好，从而识别出影响蠕变的关键因素。建立了微观组织诱导的机器学习模型来描述微观组织与蠕变之间的关系，以评估各种微观组织指标的重要性。该研究直接验证了高压加速纳米压痕蠕变的机理。定量分析了微观结构指标对蠕变的影响，发现模量降低导致的侵彻深度与蠕变的相关性最强。表面力的详细分析为设计实验和优化材料性能提供了有价值的见解。Continuous magnetic-gradient hydrogel with augmented mechanical span and reverse-directional polysaccharides distribution for integrated repair of osteochondral defectsJunwei Xu, Yi Cui, Xuemei Sun, Zhiheng Chen, Meili Liu, Xiaogang Wang, Ping Li, Yubo Fandoi:10.1016/j.compositesb.2025.112361 具有增强力学跨度和反向分布的连续磁梯度水凝胶用于骨软骨缺损的整体修复Natural osteochondral structure exhibits a continuous mechanical gradient that reflects the distinct mechanical properties of cartilage and bone. However, few continuous gradient casting methods can fabricate gradient scaffolds that match the mechanical span of natural osteochondral tissue for repairing full-thickness osteochondral defects. This study presents a continuous magnetic-gradient hydrogel with augmented mechanical span, developed through magnetic field-induced casting and post-modification techniques, for integrated repair of osteochondral defects. Through post-modification crosslinking, the hydrogel's mechanical span reaches two orders of magnitude, which is closer to the physiological gradient of cartilage to cancellous bone. Additionally, based on the natural polysaccharide characteristics of cartilage, two traditional Chinese medicine polysaccharides (oxidized Cuscuta chinensis polysaccharide and astragalus polysaccharide) are incorporated to create reverse-gradient that promote cartilage and bone tissue repair. Coupled with the hydrogel's magnetic gradient, an external gradient magnetic field is applied to further enhance the repair effects. Experimental results, both in vitro and in vivo, demonstrate that mechanical span augmented continuous magnetic-gradient hydrogel significantly facilitates the integrated repair of osteochondral defects. This work proposes a novel strategy to augment the mechanical span characteristic of continuous gradient hydrogel, resulting in a biomimetic scaffold that closely mimics the mechanical span properties of natural osteochondral tissue.天然骨软骨结构表现出连续的力学梯度，反映了软骨和骨的不同力学特性。然而，很少有连续梯度铸造方法能够制造出与天然骨软骨组织力学跨度相匹配的梯度支架来修复全层骨软骨缺损。本研究提出了一种增强机械跨度的连续磁梯度水凝胶，通过磁场诱导铸造和后修饰技术开发，用于骨软骨缺损的整体修复。通过后改性交联，水凝胶的力学跨度达到两个数量级，更接近软骨到松质骨的生理梯度。此外，根据软骨的天然多糖特性，加入两种中药多糖（氧化菟丝子多糖和黄芪多糖），形成反向梯度，促进软骨和骨组织修复。结合水凝胶的磁梯度，施加外部梯度磁场，进一步增强修复效果。体外和体内实验结果均表明，机械跨度增强的连续磁梯度水凝胶可显著促进骨软骨缺损的整体修复。这项工作提出了一种新的策略来增加连续梯度水凝胶的机械跨度特性，从而产生一种仿生支架，它非常接近地模仿了天然骨软骨组织的机械跨度特性。Composites Science and TechnologyPreparation and Properties of Thermally Conductive and Recyclable Damping Rubbers Filled with Lignin-Graphene Hybrid FillerHuanhuan Dong, Yong Zhangdoi:10.1016/j.compscitech.2025.111132 木质素-石墨烯杂化填料导热可回收阻尼橡胶的制备及性能研究Thermally conductive and damping rubber materials could protect electronic components from the negative impact of vibration and heat built-up. Meanwhile, exploring a green and facile method to prepare and recycle the damping rubber materials is important. A hybrid filler was prepared by blending lignin, samarium chloride, and polyvinylpyrrolidone-modified graphene. Thermally conductive and damping carboxylated nitrile butadiene rubber (XNBR) composites with recyclable capability were prepared by compounding the hybrid filler with XNBR and bio-based epoxidized soybean oil was used instead of conventional curing agents. The addition of the hybrid filler significantly increased the thermal conductivity, curing rate, equilibrium torque, and crosslink density of XNBR, and enhanced the damping and mechanical properties of XNBR. With the hybrid filler content increasing, the thermal conductivity, and damping properties of XNBR improved. The end-of-life XNBR composites could be recycled and reprocessed. The recycled and reprocessed composites have good damping, mechanical properties, and thermal conductivity. The work provides a new insight into green preparation and recycling of thermally conductive and damping rubber materials.导热和阻尼橡胶材料可以保护电子元件免受振动和热量积聚的负面影响。同时，探索一种绿色、简便的制备和回收阻尼橡胶材料的方法具有重要意义。将木质素、氯化钐和聚乙烯吡咯烷酮改性石墨烯共混制备了一种杂化填料。以生物基环氧大豆油代替常规固化剂，与丁腈橡胶（XNBR）共混，制备了具有可回收性能的导热阻尼羧化丁腈橡胶（XNBR）复合材料。杂化填料的加入显著提高了XNBR的导热系数、固化速率、平衡转矩和交联密度，增强了XNBR的阻尼和力学性能。随着杂化填料含量的增加，XNBR的导热性能和阻尼性能得到改善。废弃的XNBR复合材料可以回收再加工。回收和再加工的复合材料具有良好的阻尼、力学性能和导热性。这项工作为导热和阻尼橡胶材料的绿色制备和回收提供了新的见解。来源：复合材料力学仿真Composites FEM