【新文速递】2024年3月2日复合材料SCI期刊最新文章

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今日更新：Composite Structures 2 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇

Composite Structures

Design and performance simulation of hybrid hemp/glass fiber composites for automotive front bumper beams

Napat Nawawithan, Peerapat Kittisakpairach, Supakit Nithiboonyapun, Kitchanon Ruangjirakit, Pattaramon Jongpradist

doi:10.1016/j.compstruct.2024.118003

用于汽车前保险杠横梁的混合麻/玻璃纤维复合材料的设计与性能模拟

This study investigates the use of hemp/glass fiber reinforced epoxy composites for designing automotive front bumper beams, focusing on crashworthiness and pedestrian safety. The composite bumper beam model is evaluated through low- and high-velocity crash simulations and pedestrian leg form impact tests using LS-DYNA software. Optimal stacking sequences are analyzed, with high-strength glass fibers positioned on the outer layers to bear impact loads and low-density hemp fibers in the middle. The hybrid hemp (H)/glass (G) fiber composite laminate can absorb up to 90 % of the impact energy absorbed by a glass fiber composite, with a ± 45° fiber orientation, showing exceptional energy absorption capabilities. The [G(±45°)4, H(±45°)4]S composite bumper beam offers superior impact performance, safety, and a weight reduction of 49.2 % compared to a commercial steel bumper beam. This study highlights the potential of natural fiber composites as sustainable alternatives in automotive design.

本研究调查了麻/玻璃纤维增强环氧树脂复合材料在汽车前保险杠横梁设计中的应用，重点关注耐撞性和行人安全。通过低速和高速碰撞模拟以及使用 LS-DYNA 软件进行的行人腿部冲击测试，对复合材料保险杠横梁模型进行了评估。对最佳堆叠顺序进行了分析，高强度玻璃纤维位于外层以承受冲击载荷，低密度麻纤维位于中间。混合麻（H）/玻璃（G）纤维复合层压板吸收的冲击能量可达玻璃纤维复合材料的 90%，纤维取向为 ±45°，显示出卓越的能量吸收能力。G（±45°）4，H（±45°）4]S 复合材料保险杠横梁具有卓越的冲击性能和安全性，与商用钢保险杠横梁相比，重量减轻了 49.2%。这项研究凸显了天然纤维复合材料作为汽车设计中可持续替代品的潜力。

Composites Part B: Engineering

Thermomechanical characterisation of reprocessable, siloxane-based, glass-fibre-reinforced vitrimers

Virginia Amfilochiou, Tapas Debsharma, Ives De Baere, Lode Daelemans, Filip Du Prez, Wim Van Paepegem

doi:10.1016/j.compositesb.2024.111354

硅氧烷基玻璃纤维增强型可再加工玻璃纤维的热力学特性分析

Polymer composites have been extensively used for the last 30 years in the automotive, green-energy, maritime and aerospace industries. While the demands of composites' applications are increasing, complications are arising regarding their sustainability. In this work, a siloxane-based vitrimer with fast stress-relaxation, and its Glass-Fibre-Reinforced Vitrimer (GFRV) were manufactured and mechanically characterised as a sustainable alternative to thermoset composites produced by infusion. Dynamic mechanical analysis and differential scanning calorimetry were performed to identify the ageing effect on the glass-transition temperature of the materials. Tensile and in-plane shear tests were executed to investigate the materials’ performance at elevated temperature. The results were compared to the ones of a thermoset benchmark and showed that after ageing and up to 50 °C, both the neat vitrimer and its corresponding composite exhibited a thermomechanical performance comparable to their thermoset counterparts. GFRV specimens were then successfully reprocessed by hot-pressing up to two consecutive cycles. The GFRV specimen was thermoformed into an omega-stiffener profile by the first hot-pressing cycle, while its flat profile was restored during the second cycle. Finally, the reprocessing results were evaluated by optical microscopy, demonstrating that the newly developed advanced GFRV is indeed a viable, sustainable alternative.

过去 30 年来，聚合物复合材料已广泛应用于汽车、绿色能源、航海和航空航天等行业。在复合材料应用需求不断增长的同时，复合材料的可持续发展问题也日益复杂。在这项研究中，我们制造了一种具有快速应力松弛功能的硅氧烷基玻璃聚合物及其玻璃纤维增强玻璃聚合物（GFRV），并对其进行了机械性能表征，以作为通过导流生产的热固性复合材料的可持续替代品。通过动态机械分析和差示扫描量热法确定了老化对材料玻璃化转变温度的影响。为了研究材料在高温下的性能，还进行了拉伸和平面剪切试验。测试结果与热固性材料的测试结果进行了比较，结果表明，经过高达 50 ° C 的老化后，纯玻璃聚合物及其相应复合材料的热机械性能与热固性材料相当。随后，GFRV 试样通过连续两个循环的热压成功地进行了再加工。在第一个热压循环中，GFRV 试样被热成型为欧米茄加固轮廓，而在第二个循环中，其扁平轮廓得以恢复。最后，通过光学显微镜对再加工结果进行了评估，证明新开发的先进 GFRV 确实是一种可行的、可持续的替代品。

Composites Science and Technology

High-efficiency electromagnetic wave absorption of lightweight Nb2O5/CNTs/polyimide with excellent thermal insulation and compression resistance integration

Yuanyuan Zeng, Lan Long, Jiaqi Yu, Yuqi Li, Yang Li, Wei Zhou

doi:10.1016/j.compscitech.2024.110531

轻质 Nb2O5/CNTs/ 聚酰亚胺的高效电磁波吸收技术，具有优异的隔热性和抗压性一体化性能

With the widespread application of electronic devices, multifunctional electromagnetic wave (EMW) absorbing materials suitable for complex high-temperature and high-pressure environments, have attracted tremendous research attention. Herein, multifunctional polyimide (PI) composites doped with fluffy Nb2O5/CNTs microspheres (NBCP) were prepared by combining the ultrasonic spraying process and freeze-drying technique. Introduction of fillers results in the formation of diverse conduction paths and heterogeneous interfaces, which enhance the dielectric loss. Furthermore, the multi-porous structure of the PI matrix induces multiple reflection scattering events and improves the impedance matching. Such a multi-loss mechanism endows NBCP with an excellent EMW absorption performance. At 15 vol% filling, the minimum reflection loss is −41.66 dB, the effective absorption bandwidth is 2.63 GHz, and the radar cross-section is reduced by 85%. Furthermore, NBCP exhibits outstanding mechanical properties and a thermal insulation of over 100 °C in thermal environment at 150 °C. The proposed multifunctional NBCP is thus an efficient EMW absorber that offers significant potential for applications in harsh environments.

随着电子设备的广泛应用，适用于复杂高温高压环境的多功能电磁波（EMW）吸收材料引起了人们的极大关注。本文结合超声喷涂工艺和冷冻干燥技术，制备了掺杂绒毛状 Nb2O5/CNTs 微球（NBCP）的多功能聚酰亚胺（PI）复合材料。填料的引入导致形成了不同的传导路径和异质界面，从而提高了介电损耗。此外，PI 基体的多孔结构还诱导了多重反射散射事件，改善了阻抗匹配。这种多重损耗机制赋予了 NBCP 极佳的电磁波吸收性能。当填充量为 15 vol% 时，最小反射损耗为 -41.66 dB，有效吸收带宽为 2.63 GHz，雷达截面减少了 85%。此外，NBCP 还具有出色的机械性能，在 150 °C 的热环境中隔热性能超过 100 °C。因此，所提出的多功能 NBCP 是一种高效的电磁波吸收器，在恶劣环境中的应用潜力巨大。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年3月5日复合材料SCI期刊最新文章

今日更新：Composites Part A: Applied Science and Manufacturing 1 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composites Part A: Applied Science and ManufacturingMulti-stimuli-responsive shape memory flexible composites based on magnetic melamine/polydopamine/phosphorene complex foams and polyethylene glycolTao Shi, Huan Liu, Xiaodong Wangdoi:10.1016/j.compositesa.2024.108117 基于磁性三聚氰胺/多巴胺/膦炔复合泡沫和聚乙二醇的多刺激响应形状记忆柔性复合材料We have developed a novel type of flexible multi-stimuli-responsive shape memory composite system based on a melamine/polydopamine (PDA)/Fe3O4/phosphorene (PR) complex foam and poly(ethylene glycol) (PEG). The system was constructed through coating PDA on the skeleton of the melamine foam and then decorating the PDA layer with Fe3O4 and PR, followed by vacuum impregnation of PEG. The resultant composites exhibit an intrinsic thermal-driven shape memory behavior with a high shape recovery ratio of around 100% thanks to their high latent heat capacity derived from the loaded PEG. The introduction of magnetic Fe3O4 nanoparticles and PR nanosheets not only enhances the thermal conductance of the composites but also generates good magnetic and photothermal responsiveness. This enables the composites to obtain good light- and magnetic-driven shape memory capabilities in a shorter shape recovery period. This study offers a new strategy for developing smart materials with multiple and effective response to light, heat, and magnetism.我们以三聚氰胺/多巴胺（PDA）/氧化铁/膦（PR）复合泡沫和聚（乙二醇）（PEG）为基础，开发了一种新型柔性多刺激响应形状记忆复合材料系统。该系统是通过在三聚氰胺泡沫的骨架上涂覆 PDA，然后用 Fe3O4 和 PR 装饰 PDA 层，接着真空浸渍 PEG 而形成的。由于负载 PEG 带来的高潜热容量，由此产生的复合材料表现出固有的热驱动形状记忆行为，形状恢复率高达 100%。磁性 Fe3O4 纳米颗粒和 PR 纳米片的引入不仅增强了复合材料的导热性，还产生了良好的磁性和光热响应性。这使得复合材料能够在较短的形状恢复期内获得良好的光和磁驱动形状记忆能力。这项研究为开发对光、热和磁具有多种有效响应的智能材料提供了一种新策略。Composites Part B: EngineeringRegulated orientation and exfoliation of flaky fillers by close packing structures in polymer composites for excellent thermal conduction and EMI shieldingJiahui Hong, Ning Luo, Zhengmao Zhang, Liang Zhang, Guanghui Zhang, Lijun Ye, Suprakas Sinha Ray, Yongjin Lidoi:10.1016/j.compositesb.2024.111357 通过聚合物复合材料中的紧密堆积结构调节片状填料的取向和剥离，实现优异的热传导和电磁干扰屏蔽性能Efficient heat dissipation and electromagnetic interference (EMI) shielding are essential demands on packaging intensively integrated circuits in advanced electronics. Multicompetent polymer composites with thermal conduction and EMI shielding capacity have attracted tremendous interest in the material science community. Herein, we report the preparation of thermally conductive polymer composites with superior EMI shielding effectiveness (SE) by building a 3D interconnected conductive network under close-packing circumstances. The build of the 3D network relies on the coordinated stacking of flaky and spherical fillers, where the asymmetric graphite flakes (FG) are confined in the interstitial regions of the close-packing structures of hollow glass microspheres (HGμS). The “rigid” close-packing structure of HGμS inhibits the in-plane orientation of FG along the flow direction during melt processing and facilitates the exfoliation of FG under external forces producing a conductive network with enhanced interconnectedness. The model system comprised of thermoplastic polyurethane (TPU), FG and HGμS has attained in-plane and through-plane thermal conductivity of 20.54 W m−1 K−1 and 6.55 W m−1 K−1 with 30 vol% FG (while maintaining a low mass density of 1.15 g cm−3, identical to neat TPU). Meanwhile, a high EMI SE of 69 dB has been achieved at a thickness of 1 mm.高效散热和电磁干扰（EMI）屏蔽是先进电子产品中密集集成电路封装的基本要求。具有热传导和电磁干扰屏蔽能力的多功能聚合物复合材料引起了材料科学界的极大兴趣。在此，我们报告了在紧密堆积的情况下，通过构建三维互连导电网络，制备出具有卓越电磁干扰屏蔽效果（SE）的导热聚合物复合材料。三维网络的构建依赖于片状和球形填料的协调堆叠，其中不对称石墨片（FG）被限制在中空玻璃微球（HGμS）紧密堆积结构的间隙区域。在熔融加工过程中，HGμS 的 "刚性 "紧密堆积结构抑制了石墨烯沿流动方向的平面内取向，并有利于石墨烯在外力作用下剥离，形成互连性更强的导电网络。由热塑性聚氨酯 (TPU)、FG 和 HGμS 组成的模型系统在含有 30 Vol% FG 的情况下，平面内和通面热导率分别达到 20.54 W m-1 K-1 和 6.55 W m-1 K-1（同时保持 1.15 g cm-3 的低密度，与纯 TPU 相同）。同时，在厚度为 1 毫米时，EMI SE 高达 69 分贝。Composites Science and TechnologyPhoto-curable bio-based comb/bottle brush epoxy resin/beeswax/copper foam phase change materials with high enthalpy value, high conductivity, and multifunctional propertiesYanyun Li, Yu Fan, Ziyu Liu, Junying Zhang, Jue Cheng, Qingsong Liandoi:10.1016/j.compscitech.2024.110506 具有高焓值、高导电性和多功能特性的光固化生物基梳子/瓶刷环氧树脂/蜂蜡/泡沫铜相变材料At present, the demand for green energy has reached a new height in history, and thermal energy storage technology has been widely used to reduce energy consumption. It is still a challenge to develop bio-based polymeric form-stable phase change materials (FSPCMs) with high enthalpy value and thermal conductivity (TC), short curing time, and multifunctional properties. This work not only exploited a series of adjustable and photo-curable comb/bottle brush bio-based epoxy resin/beeswax (bw) FSPCMs with the above superiorities, but also revealed the effects of cross-linking density on the energy storage capacity and encapsulation rate of the FSPCMs. As a result, the optimal system can encapsulate the maximum amount of bw (60 wt%) and obtain the highest enthalpy value (142.1 J/g) with only 0.5% enthalpy loss. Through further introducing the optimal curing system into the copper (Cu) foam, the electromagnetic interference shielding property, TC, tensile strength, and photo-thermal conversion efficiency of the final composite (modified by Cu of 95% porosity) can reach 110 dB, 2.387 W m−1K−1, 2.81 MPa, and 80%, respectively, and the enthalpy value (84.2 J/g) is still satisfactory. This study can provide theoretical guidance for the structural design of reliable fast photo-curable bio-based polymeric FSPCMs with excellent phase change performances and multifunctional properties.目前，人们对绿色能源的需求已达到历史新高度，热能储存技术已被广泛用于降低能源消耗。开发具有高热焓值和热导率（TC）、固化时间短、多功能特性的生物基高分子形稳相变材料（FSPCMs）仍是一项挑战。这项研究不仅开发了一系列具有上述优点的可调光固化梳状/瓶刷状生物基环氧树脂/蜂蜡（bw）FSPCM，还揭示了交联密度对 FSPCM 储能能力和封装率的影响。结果表明，最佳体系可以封装最大量的 bw（60 wt%），并获得最高的焓值（142.1 J/g），而焓损失仅为 0.5%。通过在泡沫铜（Cu）中进一步引入最佳固化体系，最终复合材料（孔隙率为 95% 的 Cu 改性）的电磁干扰屏蔽性能、TC、拉伸强度和光热转换效率分别达到 110 dB、2.387 W m-1K-1、2.81 MPa 和 80%，焓值（84.2 J/g）仍然令人满意。该研究可为具有优异相变性能和多功能特性的可靠快速光固化生物基聚合物 FSPCM 的结构设计提供理论指导。来源：复合材料力学仿真Composites FEM