Composites Science and Technology最新文献

Self-adaptive capacitive-resistive mode-conversion sensor for thermo-tactile perception via high-κ nanocomposites 基于高κ纳米复合材料的热触觉感知自适应容阻模式转换传感器

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-12-05 DOI: 10.1016/j.compscitech.2025.111479

Wenxuan Ding , Bohao Xu , Weihe Chen , Siyang Wang , Yonglin Chen , Wenbin Kang , Weidong Yang

The thermo-tactile linkage perception of human skin is an important mechanism for maintaining life safety. However, existed biomimicking electronic skin sensors are difficult to achieve active regulation of touch by temperature information. So far, some multimodal and multifunctional flexible sensors have made progress, but most of them are limited to independent signal acquisition and parallel processing, lacking the cross-modal collaborative response capability of biological organisms. Therefore, this work proposes a self-adaptive capacitive-resistive mode-conversion pressure sensor, whose mode-converting function can be achieved by a high relative permittivity (high-κ) nanocomposite layer and a temperature sensitive insulation layer. The capacitive pressure sensing mode is constructed at the ambient temperatures below the phase transition temperature of the insulation layer, exhibiting high stability and repeatability. When the ambient temperature rises to the phase transition point, conductive pathways are formed, thus the flexible pressure sensor converts to resistive pressure sensing mode. The mode conversion characteristics were experimentally demonstrated through robot hand grasping the hot water cup, where temperature-triggered adaptive converting of sensing mechanism. This mode-conversion flexible pressure sensor achieves perception of dangerous temperatures through the recognition of electrical signal patterns, providing new ideas for the development of intelligent electronic skin with environmental adaptability.

人体皮肤的热触觉联动感知是维持生命安全的重要机制。然而，现有的仿生电子皮肤传感器难以实现基于温度信息的触觉主动调节。迄今为止，一些多模态、多功能柔性传感器取得了一定的进展，但大多局限于独立的信号采集和并行处理，缺乏生物有机体的跨模态协同响应能力。因此，本工作提出了一种自适应容阻式模式转换压力传感器，其模式转换功能可以通过高相对介电常数（高κ）纳米复合材料层和温度敏感绝缘层来实现。电容式压力传感模式是在低于绝缘层相变温度的环境温度下构建的，具有较高的稳定性和重复性。当环境温度上升到相变点时，形成导电通路，使柔性压力传感器转变为电阻式压力传感模式。通过机械手抓取热水杯，实验验证了其模式转换特性，其中温度触发的传感机构进行了自适应转换。这种模式转换柔性压力传感器通过对电信号模式的识别实现对危险温度的感知，为具有环境适应性的智能电子皮肤的发展提供了新的思路。

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引用次数: 0

Bioinspired gradient-modulus interfacial strategy for high-strength and EMI-shielding carbon fiber composites 高强度和emi屏蔽碳纤维复合材料的仿生梯度模量界面策略

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-12-01 DOI: 10.1016/j.compscitech.2025.111469

Wenlong Hu , Lulu Yang , Fuzheng Guo , Fuzhen Xuan , Shuzheng Zhang , Xu Ma , Jie Zhi , Yu Cang , Bin Yang

The rapid growth of electronic communications has intensified electromagnetic pollution, creating an urgent need for lightweight, high-performance electromagnetic interference (EMI) shielding materials. Carbon fiber reinforced polymer composites (CFRPs) are attractive candidates due to their high specific strength, stiffness, and design flexibility, but their practical application is limited by inherently weak fiber-matrix interfaces and electrical conductivity significantly lower than metals. Inspired by the strong, versatile adhesion of mussels, we developed a hybrid coating on carbon fiber through sequential deposition of Fe³⁺-tannic acid metal-phenolic networks (MPNs), followed by in situ growth of silver nanoparticles (Ag NPs) via catechol-mediated reduction. This MPN-Ag hybrid network effectively enhances both interfacial mechanics and electrical properties. Mechanically, the smooth modulus gradient created by the hybrid interphase improves stress transfer and promotes cohesive resin failure, resulting in remarkable enhancements in interfacial property, with interfacial shear strength and transverse fiber bundle strength increasing by 85 % and 67 %, respectively. Moreover, the conductive MPN-Ag layer facilitates multiple EMI attenuation mechanisms, including reflection, conduction, and interfacial polarization losses, achieving an outstanding EMI shielding effectiveness of 22.7 dB at just 1 mm thickness. This facile, scalable strategy integrates structural reinforcement with functional performance, offering a pathway to multifunctional CFRPs capable of simultaneous mechanical robustness and effective EMI shielding. Such an approach advances the development of next-generation CFRPs for aerospace, electronics, and other advanced structural-functional applications, bridging the gap between high-performance composites and emerging multifunctional material demands.

电子通信的快速发展加剧了电磁污染，迫切需要轻质、高性能的电磁干扰屏蔽材料。碳纤维增强聚合物复合材料（CFRPs）因其高比强度、刚度和设计灵活性而成为有吸引力的候选材料，但其实际应用受到固有的纤维基体界面薄弱和导电性明显低于金属的限制。受贻贝强大而多样的粘附力的启发，我们通过顺序沉积Fe3+-单宁酸金属-酚网络（mpn），然后通过儿茶酚介导的还原原位生长银纳米粒子（Ag NPs），在碳纤维上开发了一种混合涂层。这种MPN-Ag混合网络有效地提高了界面力学性能和电学性能。从力学角度来看，杂化界面形成的光滑模量梯度改善了应力传递，促进了树脂的内聚破坏，从而显著增强了界面性能，界面剪切强度和横向纤维束强度分别提高了85%和67%。此外，导电的MPN-Ag层促进了多种EMI衰减机制，包括反射、传导和界面极化损耗，在1毫米厚度下实现了22.7 dB的出色EMI屏蔽效果。这种简单、可扩展的策略将结构加固与功能性能相结合，为同时具有机械稳健性和有效电磁干扰屏蔽的多功能cfrp提供了一条途径。这种方法推动了下一代cfrp的发展，用于航空航天、电子和其他先进的结构功能应用，弥合了高性能复合材料与新兴多功能材料需求之间的差距。

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引用次数: 0

Innovative zeolite-based approach for reducing VOCs and odors in post-consumer recycled polypropylene 创新的基于沸石的方法，减少消费后回收聚丙烯中的挥发性有机化合物和气味

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-12-01 DOI: 10.1016/j.compscitech.2025.111470

Pragti Saini , Amit Choudhari , Sampat Singh Bhati , Dharm Dutt , Stephane Le Calve

The recycling of post-consumer polypropylene (PCR-PP) is hindered by volatile organic compounds (VOCs) and unpleasant odors, which limit its use in high-value products. This study presents a novel zeolite-based strategy for upcycling PCR-PP, where zeolite 13X was incorporated (0, 0.5, 1.0, and 1.5 wt%) during extrusion and injection molding. Comprehensive characterization, including gas chromatography-mass spectrometry, sensory evaluation, and hedonic tone analysis, confirmed significant VOC adsorption and odor suppression, with 1.0 wt% zeolite achieving the most balanced performance. Mechanical testing revealed enhanced stiffness and flexural strength (up to 43.48 MPa), while Izod impact results demonstrated improved toughness at higher loadings. Thermal analyses (DSC, TGA) indicated increased crystallinity and improved thermal stability at moderate zeolite contents, with SEM and XRD confirming optimal dispersion at 0.5–1.0 wt%. Collectively, these findings highlight that zeolite incorporation not only mitigates VOC emissions but also enhances the multifunctional properties of PCR-PP composites. This scalable and cost-effective approach enables the conversion of plastic waste into high-performance, environmentally friendly materials suitable for structural, packaging, and consumer applications. The proposed method provides a promising pathway toward sustainable polymer recycling and circular economy goals.

消费后聚丙烯（PCR-PP）的回收利用受到挥发性有机化合物（VOCs）和难闻气味的阻碍，这限制了其在高价值产品中的使用。本研究提出了一种基于沸石的新型PCR-PP升级回收策略，其中沸石13X在挤出和注射成型过程中加入（0、0.5、1.0和1.5 wt%）。综合表征，包括气相色谱-质谱，感官评估和享乐音调分析，证实了显著的VOC吸附和气味抑制，1.0 wt%的沸石达到最平衡的性能。机械测试结果表明，该材料的刚度和抗弯强度（高达43.48 MPa）得到了提高，而Izod冲击结果表明，在更高的载荷下，该材料的韧性得到了提高。热分析（DSC， TGA）表明，在中等沸石含量下，结晶度增加，热稳定性得到改善，SEM和XRD证实，在0.5-1.0 wt%时分散度最佳。总的来说，这些发现强调了沸石的掺入不仅可以减少VOC的排放，还可以增强PCR-PP复合材料的多功能性能。这种可扩展且具有成本效益的方法可以将塑料废物转化为适用于结构，包装和消费应用的高性能环保材料。该方法为实现可持续聚合物回收和循环经济目标提供了一条有希望的途径。

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引用次数: 0

Development of shear-thickening-gel applied carbon fiber reinforced polymer (SACFRP) with enhanced low-velocity impact resistance 碳纤维增强聚合物（SACFRP）抗剪切增稠凝胶的研制

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-29 DOI: 10.1016/j.compscitech.2025.111464

Jianchao Zou , Wanrui Zhang , Zhenhao Liao , Yan Shen , Zhibin Han , Lei Yang , Jinglei Yang , Weizhao Zhang

Conventional carbon fiber-reinforced polymers (CFRPs) are highly susceptible to low-velocity impact (LVI) from sharp objects due to their inherent brittleness. To address this critical limitation, an innovative shear thickening gel (STG) was incorporated into CFRP through a bespoke fabrication process, resulting in the STG-applied CFRP (SACFRP). LVI tests revealed that specific impact strength of the SACFRP increased significantly by 267 % compared to the reference CFRP fabricated with the same carbon fibers and epoxy resin but without STG. Moreover, the SACFRP achieved the specific impact strength of 202 J m/kg, substantially exceeding that of other representative carbon or glass fiber-reinforced polymers. Damage analysis and Timoshenko's theoretical study highlighted distinct failure mechanisms between the SACFRP that exhibited thin-plate elastic flexure and the CFRP that experienced brittle impact failure under LVI. Additionally, ultrasonic C-scan results demonstrated enlarged effective impact-resistant area in the SACFRP due to the viscoelasticity and shear-thickening behavior of the integrated STG, facilitating energy dissipation and reducing brittleness of the composite. In summary, this work presents the manufacturing method of an innovative SACFRP composite and demonstrates its outstanding impact resistance, marking the significant advancement in development of high-performance composites.

传统的碳纤维增强聚合物（CFRPs）由于其固有的脆性，极易受到尖锐物体的低速冲击（LVI）。为了解决这一关键限制，一种创新的剪切增厚凝胶（STG）通过定制的制造工艺加入到CFRP中，从而产生了STG应用的CFRP （SACFRP）。LVI试验表明，SACFRP的比冲击强度比采用相同碳纤维和环氧树脂但不添加STG的参考CFRP提高了267%，达到202 J m/kg的比冲击强度，大大超过了其他代表性的碳或玻璃纤维增强聚合物。损伤分析和Timoshenko的理论研究强调了在LVI下SACFRP表现出薄板弹性弯曲和CFRP经历脆性冲击破坏的不同破坏机制。此外，超声c扫描结果显示，由于集成STG的粘弹性和剪切增厚行为，SACFRP的有效抗冲击面积扩大，有利于能量耗散，降低复合材料的脆性。总之，这项工作提出了一种创新的SACFRP复合材料的制造方法，并展示了其出色的抗冲击性，标志着高性能复合材料的发展取得了重大进展。

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引用次数: 0

Symmetrical gradient design of helicoidal composite laminates for enhanced damage tolerance 螺旋面复合材料层合板的对称梯度设计增强损伤容限

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-28 DOI: 10.1016/j.compscitech.2025.111465

Wenting Ouyang , Jiafan Feng , Lei Yan , Tingting Wang , Huan Wang , Bowen Gong , Xiang Gao , Hua-Xin Peng

The Bouligand architecture found in various crustacean exoskeletons was an essential feature for organisms to resist external loads, and further microscopic observations indicate that the helicoidal pitches in the exoskeleton tend to be arranged in a gradient pattern to achieve excellent damage tolerance. Inspired by such structural gradient phenomenon, multiple helicoidal units with different rotation angles are introduced for regional configuration design of the composite laminates. By mimicking the gradient-helicoidal microstructures and conducting experimental characterization, this work demonstrates that the unidirectional gradient-helicoidal design schemes, including two mutually inverted structural configurations (denoted as GH-I and GH-II), exhibit a compromise in terms of bending force and energy dissipation compared to the traditional uniform-helicoidal controls. Notably, the symmetrical gradient-helicoidal configuration (denoted as GH-III) with the same structural parameters achieves superior mechanical properties, increasing load-bearing capacity by 6 %–64 % and energy dissipation by 37 %–59 % over benchmarks. The parametric analysis of biomimetic GH-III configurations further reveals that configuring larger rotation angles on the external sides and arranging a smaller rotation angle on the inner side is an effective optimization strategy. It successfully resists the damage initiation that usually occurs on the external sides and introduces matrix cracks into the internal side for stable twisting diffusion, fully exploiting the synergistic benefits of different structural parameters in terms of damage resistance and damage tolerance. Therefore, these findings have practical implications for bionic design and fabrication, providing inspiration for composite laminates with improved mechanical properties.

在各种甲壳类动物的外骨骼中发现的Bouligand结构是生物抵抗外部载荷的基本特征，进一步的显微镜观察表明，外骨骼中的螺旋螺距倾向于以梯度模式排列，以获得良好的损伤容忍度。受这种结构梯度现象的启发，引入不同旋转角度的多个螺旋面单元进行复合材料层合板的区域构型设计。通过模拟梯度螺旋微结构并进行实验表征，本工作证明了单向梯度螺旋设计方案，包括两种相互倒置的结构构型（表示为GH-I和GH-II），与传统的均匀螺旋控制相比，在弯曲力和能量耗散方面表现出妥协。值得注意的是，具有相同结构参数的对称梯度-螺旋结构（表示为GH-III）具有优越的力学性能，比基准提高了6% - 64%的承载能力和37% - 59%的能量耗散。仿生GH-III构型的参数化分析进一步表明，在外侧配置较大的旋转角度，在内侧布置较小的旋转角度是一种有效的优化策略。它成功地抵抗了通常发生在外部的损伤起裂，并将基体裂纹引入内部以稳定扭转扩散，充分发挥了不同结构参数在抗损伤和损伤容限方面的协同效益。因此，这些发现对仿生设计和制造具有实际意义，为改善机械性能的复合材料层压板提供了灵感。

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引用次数: 0

Recoverable, impact-resistant composites by encapsulating shear-stiffening gel into 3D-printed superelastic silicone rubber skeletons via in-situ polymerization 通过原位聚合将剪切硬化凝胶封装到3d打印的超弹性硅橡胶骨架中，制成可回收的抗冲击复合材料

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-28 DOI: 10.1016/j.compscitech.2025.111467

Xingwei Feng , Jie Wang , Yongqian Chen , Jinpeng Wen , Tao Xing , Hong Shao , Yangguang Xu , Jian Li , Xicheng Huang , Changyu Tang

This study reports a compressive deformation-recoverable and high impact-resistant flexible composite fabricated by encapsulating shear-stiffening polyborosiloxane (PBS) gel into 3D-printed superelastic silicone rubber (SE) skeletons through in-situ polymerization approach, addressing critical limitations of conventional PBS, such as cold-flow and poor resilience. The approach achieves a homogeneous and high filling of PBS in the composites without leakage. Synergistic interactions between the resilient SE skeleton and strain-rate-sensitive PBS enable exceptional energy dissipation efficiency (83.6 %) and high recoverability (96.7 %) at low strain rate due to the synergistic effect of SE skeleton and PBS. The composite demonstrates superior impact-resistance, reducing peak forces by 69.1–80.6 % under high-energy impacts and exhibiting strain-rate-dependent energy absorption enhancement (79-fold increase at 5153 s⁻¹), outperforming commercial materials like EVA foam. Besides, the composite retains structural integrity after high-speed impacts due to PBS's self-healing capability via cold-flow behavior. Our approach provides a way for designing a composite with good elastic recovery, high impact resistance, and reusable energy dissipation properties for applications in wearable systems, precision equipment, and advanced armor.

本研究报告了一种压缩变形可恢复的高抗冲击柔性复合材料，通过原位聚合方法将剪切增强聚硼硅氧烷（PBS）凝胶封装到3d打印的超弹性硅橡胶（SE）骨架中，解决了传统PBS的冷流动和回弹性差等关键局限性。该方法实现了PBS在复合材料中的均匀和高填充，无泄漏。弹性SE骨架和应变率敏感的PBS之间的协同作用使得SE骨架和PBS在低应变率下具有出色的能量耗散效率（83.6%）和高的可恢复性（96.7%）。该复合材料表现出优异的抗冲击性，在高能冲击下峰值力降低69.1 - 80.6%，并表现出应变率相关的能量吸收增强（5153 s−1时增加79倍），优于EVA泡沫等商用材料。此外，由于PBS通过冷流行为的自愈能力，复合材料在高速撞击后仍能保持结构完整性。我们的方法为设计具有良好弹性恢复，高抗冲击性和可重复使用能量耗散特性的复合材料提供了一种方法，可用于可穿戴系统，精密设备和先进装甲。

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引用次数: 0

Multifunctional gradient-engineered ultrathin flexible composite films for electromagnetic interference shielding, energy storage, and Joule heating 用于电磁干扰屏蔽、储能和焦耳加热的多功能梯度工程超薄柔性复合薄膜

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-28 DOI: 10.1016/j.compscitech.2025.111466

Zhuo Cai , Xinyu Ji , Jiepeng Zhao , Dandan Li , Yifei Ma , Mei Wang , Zhaomin Tong , Xuyuan Chen

Driven by the widespread adoption of smart and portable electronic devices, ultrathin films with energy storage capabilities are required to simultaneously provide electromagnetic interference (EMI) shielding and self-heating functionalities to operate reliably in demanding environments. Given the similarities in material selection and structural design between EMI shielding materials and supercapacitor electrodes, constructing architectures that integrate efficient conductive networks and ion transport pathways is critical for developing such multifunctional materials. Gradient conductive architectures using high–aspect ratio materials to bridge layers, with layer–performance correlation analysis, offer a promising route to overcome current limitations. Here, a gradient structure was achieved by designing a multilayer ultrathin CNF-based (carbon nanofiber) film. The resulting film presents a high EMI shielding effectiveness (SE/t of 8000 dB mm⁻¹ with a thickness of 5 μm), primarily due to the synergistic sequential reflection–absorption cycles shielding mechanism and enhanced polarization losses induced by abundant interfacial interactions. The CNT/CNF network inhibits the restacking of MXene, while CNT can form bridging channels between the upper and lower conductive layers, facilitating vertical electron transport across different conductive layers. The resulting film demonstrates excellent energy storage performance in symmetric supercapacitors, achieving a specific capacitance of 92.1 F/g. The film exhibits robust mechanical performance, with a tensile strength of 198 MPa and a strain of 5.8 % and outstanding Joule heating performance with a low operating voltage (reaching 92.7 °C at 4 V). The demonstrated properties position the composite film as a compelling material for integration into advanced wearable and flexible electronic platforms.

由于智能和便携式电子设备的广泛采用，需要具有能量存储能力的超薄薄膜同时提供电磁干扰（EMI）屏蔽和自加热功能，以便在苛刻的环境中可靠地运行。考虑到电磁干扰屏蔽材料和超级电容器电极在材料选择和结构设计上的相似性，构建集成高效导电网络和离子传输途径的架构对于开发这种多功能材料至关重要。利用高纵横比材料架桥的梯度导电结构，以及层间性能的相关性分析，为克服当前的限制提供了一条有希望的途径。在这里，通过设计多层超薄cnf基（碳纳米纤维）薄膜来实现梯度结构。所制备的薄膜具有较高的电磁干扰屏蔽效果（SE/t为8000 dB mm−1，厚度为5 μm），主要是由于协同顺序反射-吸收周期屏蔽机制和丰富的界面相互作用引起的极化损失增强。CNT/CNF网络抑制了MXene的再堆积，而CNT可以在上下导电层之间形成桥接通道，促进电子在不同导电层之间的垂直传递。所得薄膜在对称超级电容器中表现出优异的储能性能，比电容达到92.1 F/g。该薄膜具有良好的力学性能，抗拉强度为198 MPa，应变为5.8%，在低工作电压（4 V时达到92.7°C）下具有出色的焦耳加热性能。所展示的性能使复合薄膜成为集成到先进可穿戴和柔性电子平台的引人注目的材料。

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引用次数: 0

A full-field frequency domain analysis of experimental and numerical damping responses in flax fiber reinforced composites under hygroscopic cycling 吸湿循环作用下亚麻纤维增强复合材料阻尼响应的频域分析

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-28 DOI: 10.1016/j.compscitech.2025.111468

Songli Tan , Bo Wen , Zhen Zhang , Qian Li , Yan Li

Flax fiber reinforced composites (FFRCs) have gained increasing attention as sustainable composites in aerospace applications, where vibration damping performance under environmental exposure is critical. However, the hygroscopic effects on the damping behavior of FFRCs, particularly in low to mid-frequency ranges, remain insufficiently understood. In this study, a full-field frequency domain analysis was conducted to investigate the damping responses of FFRCs under hygroscopic cycling. Firstly, unidirectional (0°, 45°, 90°), orthotropic and symmetric angle-ply composites were subjected to hygroscopic cycling in an environmental chamber under controlled temperature and humidity conditions. Then, all composites under various hygroscopic cycles were examined to establish the relationship between the first five-order modal frequencies, hygroscopicity and damping ratios via non-contact 3D scanning laser Doppler vibrometer. Finally, a finite element model was developed by incorporating laminate theory and the complex eigenvalue method within user-defined material subroutines to predict frequency- and moisture-dependent damping responses in full-field frequency range. The findings indicated that the damping ratio increased while the frequency were reduced in the composites subjected to hygroscopic cycling, thereby modifying the frequency dependence of energy dissipation mechanisms. Redrying to equilibrium moisture content did not restore the initial damping properties. After hygroscopic cycles, the resonance response amplitudes decreased under the same input energy. The proposed model demonstrated significant agreement with experimental results across all composites. The low-to-mid-frequency damping behavior and orientation-dependent modal responses of FFRCs under hygroscopic cycling were characterized. A novel finite element model incorporating hydrophilic properties was developed to provide critical insights for aerospace vibration mitigation.

亚麻纤维增强复合材料（ffrc）作为可持续复合材料在航空航天领域的应用越来越受到关注，在航空航天领域，环境暴露下的减振性能至关重要。然而，吸湿效应对ffrc阻尼行为的影响，特别是在低频到中频范围内，仍然没有得到充分的了解。在本研究中，对ffrc在吸湿循环下的阻尼响应进行了全场频域分析。首先，对单向（0°、45°、90°）、正交各向异性和对称角层复合材料在可控温湿度条件下进行了吸湿循环实验。然后，通过非接触式三维扫描激光多普勒测振仪对不同吸湿周期下的复合材料进行测试，建立前五阶模态频率、吸湿性和阻尼比之间的关系。最后，在用户定义的材料子程序中，结合层压理论和复特征值方法建立了有限元模型，以预测全场频率范围内频率和湿度相关的阻尼响应。结果表明，吸湿循环作用下复合材料的阻尼比增大，频率降低，从而改变了能量耗散机制的频率依赖性。重新干燥到平衡水分含量并不能恢复初始的阻尼特性。吸湿循环后，在相同的输入能量下，共振响应幅度减小。该模型与所有复合材料的实验结果一致。研究了吸湿循环作用下ffrc的低-中频阻尼特性和方向相关模态响应。开发了一种包含亲水特性的新型有限元模型，为航空航天减振提供了重要见解。

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引用次数: 0

An improved and complete closed-form solution for the mixed mode bending test for delamination in composite laminates 复合材料层合板分层混合模弯曲试验的一种改进的完全封闭解

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-26 DOI: 10.1016/j.compscitech.2025.111463

Bo Wang, Zhenmin Zou

Most existing closed-form solutions for the Mixed-Mode Bending (MMB) test, used to investigate the delamination behaviour in laminated composites, are limited to cases where the delamination length a is less than the half-span L of the specimen. More critically, since these solutions are typically derived using beam theory, the predicted mode I and mode II energy release rates become increasingly inaccurate as the delamination approaches the specimen's mid-span. The few available solutions for delamination length a > L are either erroneous or significantly inaccurate. In this study, a complete closed-form solution is developed using a sub-laminated beam model based on first order shear deformation beam theory. The accuracy of the solution is validated through comparison with results obtained from the virtual crack closure technique and cohesive zone model simulations, using 2D finite element analysis. The proposed formulation enables accurate evaluation of energy release rates for a complete delamination length range (a < L and a ≥ L). The solution is also applicable to thick specimens with cross-ply layups. Potentially, this work may help pave the way for permitting delamination propagation beyond the mid-span in the MMB test—an approach that is currently not recommended by the ASTM standard.

用于研究层压复合材料分层行为的混合模式弯曲（MMB）测试中，大多数现有的封闭解仅限于分层长度a小于试样半跨度L的情况。更关键的是，由于这些解通常是用梁理论推导出来的，随着分层接近试件的跨中，预测的I型和II型能量释放率变得越来越不准确。对于分层长度a >； L，少数可用的解决方案要么是错误的，要么是非常不准确的。本文采用基于一阶剪切变形梁理论的亚层合梁模型，建立了完全封闭解。通过与虚拟裂纹闭合技术和黏结区模型模拟结果的对比，验证了该方法的准确性。所提出的公式能够准确地评估整个分层长度范围（a <； L和a≥L）的能量释放率。该解决方案也适用于具有交叉层的厚试件。潜在地，这项工作可能有助于在MMB测试中允许分层传播超过跨中，这是ASTM标准目前不推荐的方法。

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引用次数: 0

Bioinspired Hoya carnosa-structured Al2O3/Soybean oil epoxy nanocomposites for high performance thermal interface materials 高性能热界面材料的仿生山芋结构Al2O3/大豆油环氧纳米复合材料

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-25 DOI: 10.1016/j.compscitech.2025.111462

Maoping Lyu , Hebo Shi , Qian Zhang , Yingchun Liu , Hui Zhang

Developing thermally conductive and dielectric polymeric composites is one of the critical drivers in upgrading integrated electronic devices. Herein, polydopamine and silver nanoparticles functionalized Al₂O₃ (f-Al₂O₃) with a bionic “Hoya carnosa flower” structure were prepared, and bifunctional nanocomposites were fabricated by using the f-Al₂O₃ and soybean oil-based epoxy with a solvent-free method. Morphology and microstructure analyses of the nanocomposites suggested that not only the dispersion of fillers was promoted, but also the fillers/matrix interface compatibility was optimized significantly. In addition to the role as the “bridge” for enhancing thermal conduction and reducing interfacial thermal resistance, silver nanoparticles also inhibit electron migration and suppress the interfacial space charge accumulation. As-prepared nanocomposites thus exhibited a high TC of 0.73 W m⁻¹ K⁻¹, superior dielectric properties (dielectric constant and dielectric loss are ∼3.9 and 0.03, respectively), and outstanding tensile strength (8.45 ± 0.63 MPa) and elongation at break (∼40 %). Furthermore, interfacial adhesion experiments and theoretical simulation results demonstrated that as-prepared nanocomposites presented great potential in advanced thermal interface packaging. This work offers a versatile approach and provides a new paradigm for the design and fabrication of thermally conductive and dielectric polymer composites derived from vegetable oils.

开发导热和介电聚合物复合材料是集成电子器件升级的关键驱动因素之一。在此基础上，制备了聚多巴胺和纳米银纳米粒子功能化Al2O3 (f-Al2O3)，并将f-Al2O3与大豆油基环氧树脂采用无溶剂法制备了双功能纳米复合材料。对纳米复合材料的形貌和微观结构分析表明，复合材料不仅促进了填料的分散，而且显著优化了填料/基体界面相容性。除了起到增强热传导、降低界面热阻的“桥梁”作用外，银纳米颗粒还能抑制电子迁移，抑制界面空间电荷积累。因此，制备的纳米复合材料具有0.73 W m−1 K−1的高TC，优越的介电性能（介电常数和介电损耗分别为~ 3.9和0.03），以及出色的抗拉强度（8.45±0.63 MPa）和断裂伸长率（~ 40%）。此外，界面粘附实验和理论模拟结果表明，所制备的纳米复合材料在先进的热界面封装中具有很大的潜力。这项工作提供了一个通用的方法，并为设计和制造来自植物油的导热和介电聚合物复合材料提供了一个新的范例。

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引用次数: 0