【新文速递】2024年3月25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 Science and Technology 1 篇Composite StructuresStiffness-driven design and optimization of a 3D-printed composite prosthetic foot: A beam finite Element-Based frameworkAbdel Rahman N. Althahabi, Luca M. Martulli, Andrea Sorrentino, Marino Lavorgna, Emanuele Gruppioni, Andrea Bernasconidoi:10.1016/j.compstruct.2024.118053三维打印复合材料义足的刚度驱动设计与优化：基于梁有限元的框架Composite foot prostheses are traditionally produced via lamination, a process that grants high structural efficiency. However, it is an expensive and time-consuming process. Production rate and customizability are thus limited. Additive manufacturing of composites can be a potential solution to these limitations. This work presents a tool to design and optimize Continuous Fiber-Reinforced Additively Manufactured (CFRAM) prosthetic feet using beam Finite Element (FE) modeling. This optimization tool was developed for weight minimization and obtaining a CFRAM prosthesis design matching up to three static stiffness parameters. The design variables were defined through parametrizing the geometry of the prosthesis designed and using the composite structure parameters. Thanks to the versatility of the tool, solutions to multiple optimization and design cases were used to assess different design concepts, such as the shape of the prosthesis (C-shape or J-shape). Also, the tool successfully duplicated the stiffness characteristics of an assumed laminated prosthesis. Finally, the sources of inaccuracy associated with the beam FE modeling approach were identified through a comparison with plane stress FE analysis.复合材料脚假肢传统上是通过层压工艺生产的，这种工艺具有很高的结构效率。然而，这种工艺既昂贵又耗时。因此，生产率和可定制性受到限制。复合材料的增材制造是解决这些限制的潜在方法。这项工作介绍了一种利用梁有限元（FE）建模设计和优化连续纤维增强增材制造（CFRAM）义足的工具。开发该优化工具的目的是使重量最小化，并获得与三个静态刚度参数相匹配的 CFRAM 假肢设计。设计变量是通过设计假肢的几何参数和复合结构参数来定义的。得益于该工具的多功能性，多个优化和设计案例的解决方案被用于评估不同的设计理念，如假体形状（C 形或 J 形）。此外，该工具还成功复 制了假定层叠假体的刚度特征。最后，通过与平面应力 FE 分析的比较，确定了与梁 FE 建模方法相关的不准确性来源。Composites Part A: Applied Science and ManufacturingIn-situ solid-state deformation-driven rapid reaction towards higher strength-ductility Al-CuO compositesDongxin Mao, Xiaotian Ma, Yuming Xie, Xiangchen Meng, Naijie Wang, Zeyu Zhang, Xiuwen Sun, Yongxian Huangdoi:10.1016/j.compositesa.2024.108174 原位固态变形驱动快速反应，实现更高强度和电导率的 Al-CuO 复合材料The strength-ductility dilemma of metallic matrix composites is mainly attributed to the mismatched phase/matrix interfaces, which induce stress concentration as dislocation piles up. Here, coherent nano-Al2O3 phases were in-situ formed in Al-CuO composites via rapid diffusion of neoteric deformation-driven metallurgy. The complex dislocation configuration was also promoted to induce the formation of about 14.5 % incoherent twin boundaries. The mean free path for dislocation movements was expanded, as dislocations could cut through the coherent nano-Al2O3 phases and interact with the incoherent twin boundaries without piled-up dislocations. The yield strength and elongation of the strength-ductility synergy Al-5CuO composites were 201 ± 14 MPa and 16.1 ± 0.5 %, indicating that in-situ Al2O3-Al coherent interface and incoherent twin boundaries exert remarkable ability of dislocation transmission.金属基复合材料的强度-电导率困境主要归因于不匹配的相/基界面，这种界面会随着位错的堆积而导致应力集中。在这里，通过新形变驱动冶金的快速扩散，在 Al-CuO 复合材料中就地形成了相干的纳米 Al2O3 相。复杂的位错配置也促进了约14.5%的非相干孪晶边界的形成。位错运动的平均自由路径扩大了，因为位错可以穿过相干的纳米 Al2O3 相，并与不相干的孪生边界相互作用，而不会堆积位错。强度-电导率协同效应 Al-5CuO 复合材料的屈服强度和伸长率分别为 201 ± 14 MPa 和 16.1 ± 0.5 %，表明原位 Al2O3-Al 相干界面和非相干孪晶边界具有显著的位错传输能力。Composites Science and TechnologyIn-situ exfoliation of hexagonal boron nitride during the forced flow of highly elastic polylactide to fabricate electrospun fibrous film with high thermal conductivity and low dielectric lossRuixue Wu, Xudong Song, Yuan Ji, Hong Wu, Shaoyun Guo, Jianhui Qiudoi:10.1016/j.compscitech.2024.110573 在高弹性聚乳酸的强制流动过程中原位剥离六方氮化硼，以制造具有高热导率和低介电损耗的电纺纤维膜Boron nitride nanosheets (BNNS) have promising applications in thermal management materials, due to their high thermal conductivity and low dielectric loss. However, it is still challenging to fabricate BNNS with large lateral size and structural integrity via solvent-free methods. Here, we report a novel processing method for in-situ exfoliation of hexagonal boron nitride (h-BN) to fabricate BNNS with an average lateral size of 1.45 μm, average thickness of 4.88 nm and few lattice defects during the forced flow of polylactide (PLA) in a highly elastic state. We further fabricate flexible and bio-degradable PLA/BNNS electrospun fibrous film for electronic devices to replace petroleum-based composites. The PLA/BNNS fibrous film exhibits an in-plane thermal conductivity of 4.9 W/(m·K) at the BNNS loading of 20 wt%. Moreover, the fibrous film also has a low dielectric loss (0.007 at 1 kHz) and good electrical insulation. The in-situ exfoliation strategy is simple, economical and environmentally friendly, providing an effective route to design thermal management materials with high thermal conductivity and low dielectric loss in the future of electronic devices.氮化硼纳米片（BNNS）具有高热导率和低介电损耗的特点，因此在热管理材料领域有着广阔的应用前景。然而，通过无溶剂方法制造具有大横向尺寸和结构完整性的 BNNS 仍然具有挑战性。在此，我们报告了一种原位剥离六方氮化硼（h-BN）的新型加工方法，在高弹性聚乳酸（PLA）的强制流动过程中，制备出平均横向尺寸为 1.45 μm、平均厚度为 4.88 nm 且晶格缺陷极少的 BNNS。我们进一步制备了柔韧且可生物降解的聚乳酸/BNNS电纺纤维膜，用于电子设备以取代石油基复合材料。当 BNNS 含量为 20 wt% 时，聚乳酸/BNNS 纤维薄膜的面内导热系数为 4.9 W/(m-K)。此外，该纤维膜还具有较低的介电损耗（1 kHz 时为 0.007）和良好的电绝缘性。这种原位剥离策略简单、经济、环保，为未来电子设备设计具有高热导率和低介电损耗的热管理材料提供了一条有效途径。来源：复合材料力学仿真Composites FEM