【新文速递】2024年4月1日复合材料SCI期刊最新文章

今日更新：Composite Structures 1 篇，Composites Part A: Applied Science and Manufacturing 1 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composite StructuresA novel ductile connection for FRP pultruded beam-to-column assembliesFrancesco Ascione, Mario D'Aniello, Luciano Feo, Luigi Granata, Raffaele Landolfodoi:10.1016/j.compstruct.2024.118091玻璃钢拉挤梁柱组件的新型延性连接方式The resistance, stiffness and ductility of the joints between Fibre Reinforced Polymer (FRP) members play a key role in ensuring the required structural performance of pultruded composite frames. Both bonded and bolted joints are characterised by poor mechanical performance due to brittle failure and low resistance respectively. Hybrid joints are stronger and more ductile, but are still affected by some criticisms such as (i) non-repairability, (ii) the presence of holes in the fibre-reinforced material, (iii) the difficulty of assembling a transverse beam into the joint, which is typically required for real 3D systems. To overcome such limitations, a novel ductile connection has been developed by combining ductile steel elements bonded to FRP members. The steel elements are bolted together and are designed to be weaker than the FRP profiles and adhesive. Experimental tests on beam-column assemblies have been carried out and the test results have shown that the investigated hybrid connection is characterised by adequate stiffness, resistance and high ductility. The damage is concentrated in the bolted steel elements, which can be easily replaced, confirming the repairability of the assembly.纤维增强聚合物（FRP）构件之间接头的阻力、刚度和延展性对于确保拉挤复合材料框架所需的结构性能起着关键作用。粘合连接和螺栓连接的机械性能都很差，原因分别是脆性破坏和低阻力。混合连接强度更高、延展性更好，但仍受到一些批评，如：(i) 不可修复性，(ii) 纤维增强材料中存在孔洞，(iii) 难以将横梁装配到连接中，而这正是真正的三维系统通常需要的。为了克服这些限制，我们开发了一种新型延性连接，将延性钢构件与玻璃纤维增强材料构件结合在一起。钢构件通过螺栓连接在一起，设计强度低于玻璃钢型材和粘合剂。对梁柱组件进行了实验测试，测试结果表明，所研究的混合连接具有足够的刚度、阻力和高延展性。损坏主要集中在螺栓连接的钢构件上，这些构件可以很容易地进行更换，从而证实了该组件的可修复性。Composites Part A: Applied Science and ManufacturingLightweight multifunctional electromagnetic shielding composites achieved by depositing Ag@MXene hybrid particles on wood-based aerogelShuang Wu, Ting-yu Zhu, Zhu Zeng, De-xiang Sun, Jing-hui Yang, Xiao-dong Qi, Yong Wangdoi:10.1016/j.compositesa.2024.108193 通过在木质气凝胶上沉积 Ag@MXene 混合颗粒实现轻质多功能电磁屏蔽复合材料As electronic devices become more integrated into daily life, concerns about electromagnetic radiation pollution become more severe, despite the increased portability they offer. Designing a lightweight and multifunctional material that is environmentally friendly, thermally conductive, and electromagnetically shielded is urgently needed. In this work, novel composites were fabricated by incorporating Ag@MXene hybrid particles into the wood-based aerogel. Compared with the aerogels containing only Ag nanoparticles (AgNPs) or MXene, the Ag@MXene/W aerogel exhibited more homogeneous dispersion of unfolded MXene nanosheets and more AgNPs but higher porosity (97.1 %) and smaller density (0.047 g cm−3). Consequently, the Ag@MXene/W aerogel exhibited high compressibility and low energy dissipation, remarkable strain sensitivity, impressive electrical conductivity (33.9 S m−1) and specific electromagnetic shielding efficiency (5765.96 dB cm2 g−1), and high thermal conductivity (0.81 W m−1 K−1). The excellent comprehensive performances ensure that the aerogel has wide applications in various fields, including electromagnetic pollution protection, strain detecting, and thermal management, etc.随着电子设备越来越多地融入日常生活，人们对电磁辐射污染的担忧也越来越严重，尽管这些设备具有更强的便携性。设计一种环保、导热、电磁屏蔽的轻质多功能材料迫在眉睫。在这项研究中，通过在木质气凝胶中加入 Ag@MXene 混合颗粒，制造出了新型复合材料。与仅含银纳米粒子（AgNPs）或MXene的气凝胶相比，Ag@MXene/W气凝胶显示出更均匀的展开MXene纳米片和更多的AgNPs，但孔隙率更高（97.1%），密度更小（0.047 g cm-3）。因此，Ag@MXene/W 气凝胶具有高压缩性和低能量耗散、显著的应变敏感性、出色的导电性（33.9 S m-1）和特定电磁屏蔽效率（5765.96 dB cm2 g-1）以及高导热性（0.81 W m-1 K-1）。出色的综合性能确保了气凝胶在电磁污染防护、应变检测和热管理等多个领域的广泛应用。Composites Part B: EngineeringA mechanical strong yet ductile CoCrNi/Cr2B composite enabled by in-situ formed borides during laser powder bed fusionJunhua Hou, Bingnan Qian, Zhiguang Zhu, Sihao Zou, Gan Li, Qiang Zhu, Wenjun Ludoi:10.1016/j.compositesb.2024.111428 在激光粉末床熔融过程中原位形成的硼化物使 CoCrNi/Cr2B 复合材料具有机械强度和韧性The design of metal matrix composites predominantly focusses on synergistically integrating the intrinsic properties of matrix and reinforcing phase aiming to achieve outstanding strength and ductility simultaneously. In metal matrix composites, the reinforcing phase invariably faces challenges such as agglomeration and non-uniform distribution, resulting in a significant reduction in mechanical properties. Here, we propose a method to overcome this barrier through an in-situ alloying of laser powder bed fusion i.e., redistributing the reinforcing phase (Cr2B boride) in medium entropy alloy matrix (CoCrNi). The in-situ alloying can be achieved by a mixture of CoCrNi powders and B4C particles. After remelting, a nano-sized core-shell structure is developed by establishing “soft core” of CoCrNi matrix embedded with “hard shell” of Cr2B boride. Such nano-sized core-shell structure mainly contributes to a yield strength (867 ± 1.6 MPa), a high tensile strength (1200 ± 13 MPa) and a decent ductility (17 ± 0.5%) of the CoCrNi/Cr2B composite due to the load bearing strengthening and hetero-deformation induced hardening. Additionally, the crack propagation can be suppressed by the CoCrNi matrix/Cr2B interface. The insights provide a new design strategy of in-situ formation of the nano-sized core-shell structure to develop the metal matrix composites with high strength and ductility.金属基复合材料的设计主要侧重于将基体和增强相的固有特性进行协同整合，以同时获得出色的强度和延展性。在金属基复合材料中，增强相总是面临团聚和分布不均匀等挑战，导致机械性能显著降低。在此，我们提出了一种克服这一障碍的方法，即通过激光粉末床融合的原位合金化，在中熵合金基体（CoCrNi）中重新分配增强相（硼化 Cr2B）。钴铬镍粉末和 B4C 颗粒的混合物可实现原位合金化。重熔后，通过建立钴铬镍基体的 "软核 "和嵌入硼化铬的 "硬壳"，形成了纳米级的核壳结构。这种纳米级核壳结构主要通过承载强化和异质变形诱导硬化，使 CoCrNi/Cr2B 复合材料具有较高的屈服强度（867 ± 1.6 兆帕）、拉伸强度（1200 ± 13 兆帕）和良好的延展性（17 ± 0.5%）。此外，CoCrNi 基体/Cr2B 界面还能抑制裂纹扩展。这些见解为原位形成纳米级核壳结构以开发具有高强度和延展性的金属基复合材料提供了新的设计策略。Composites Science and TechnologyEnhancing structural battery performance: Investigating the role of conductive carbon additives in LiFePO4-Impregnated carbon fiber electrodesYasemin Duygu Yücel, Erik Adolfsson, Henrik Dykhoff, Jocke Pettersson, Stacy Trey, Maciej Wysocki, Erika Widenkvist Zetterström, Dan Zenkert, Rakel Wreland Lindström, Goran Lindberghdoi:10.1016/j.compscitech.2024.110571 提高结构电池性能：研究导电碳添加剂在磷酸铁锂浸渍碳纤维电极中的作用This study centers on investigating the influence of conductive additives, carbon black (Super P) and graphene, within the context of LiFePO4 (LFP)-impregnated carbon fibers (CFs) produced using the powder impregnation method. The performance of these additives was subject to an electrochemical evaluation. The findings reveal that there are no substantial disparities between the two additives at lower cycling rates, highlighting their adaptability in conventional energy storage scenarios. However, as cycling rates increase, graphene emerges as the better performer. At a rate of 1.5C in a half-cell versus lithium, electrodes containing graphene exhibited a discharge capacity of 83 mAh g LFP − 1 ; those with Super P and without any additional conductive additive showed a capacity of 65 mAh g LFP − 1 and 48 mAh g LFP − 1 , respectively. This distinction is attributed to the structural and conductivity advantages inherent to graphene, showing its potential to enhance the electrochemical performance of structural batteries. Furthermore, LFP-impregnated CFs were evaluated in full cells versus pristine CFs, yielding relatively similar results, though with a slightly improved outcome observed with the graphene additive. These results provide valuable insights into the role of conductive additives in structural batteries and their responsiveness to varying operational conditions, underlining the potential for versatile energy storage solutions.本研究主要探讨导电添加剂炭黑（Super P）和石墨烯对采用粉末浸渍法生产的磷酸铁锂（LFP）浸渍碳纤维（CF）的影响。对这些添加剂的性能进行了电化学评估。研究结果表明，在较低的循环速率下，两种添加剂之间没有实质性差异，这突出表明了它们在传统储能方案中的适应性。然而，随着循环速率的增加，石墨烯的性能更优。在半电池与锂电池的 1.5C 循环速率下，含有石墨烯的电极显示出 83 mAh g LFP - 1 的放电容量；含有超级 P 和不含任何额外导电添加剂的电极分别显示出 65 mAh g LFP - 1 和 48 mAh g LFP - 1 的容量。这种区别归因于石墨烯固有的结构和导电性优势，显示出其增强结构电池电化学性能的潜力。此外，在完整电池中对浸渍了 LFP 的 CF 与原始 CF 进行了评估，结果相对相似，但石墨烯添加剂的结果略有改善。这些结果为了解导电添加剂在结构电池中的作用及其对不同操作条件的响应提供了宝贵的见解，凸显了多功能储能解决方案的潜力。来源：复合材料力学仿真Composites FEM