超模压多材料热塑性复合材料的挠曲行为和异质界面断裂

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2024-11-06 DOI:10.1016/j.coco.2024.102152

Shanmugam Logesh, Yi Wen Cheah, Keen Hoe Ho, Brindha K. Rajan, Clara Cher Lin Tan, Andi Haris, Chen Wang

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引用次数: 0

摘要

为满足航空航天和汽车行业的需求，开发轻质多材料复合材料势在必行。以热塑性塑料为基础的多材料复合材料是一种新方法，它将两种或多种不同的复合材料结合在一起，形成一种具有更高性能特征的混合材料。然而，复合材料多尺度界面上的不同失效模式会以复杂的方式影响其机械性能。在这项研究中，通过在连续纤维增强热塑性聚碳酸酯（CFRTP）层压板上包覆原生聚碳酸酯（VP）和短纤维增强聚碳酸酯（SFP）来制造多材料复合材料，以评估异质界面的行为和弯曲加载下的结构性能。在压缩包覆成型过程中，热塑性塑料的固结会在多材料界面上产生聚合物链的相互扩散。与 VP、SFP 和 CFRTP 等单一材料成分相比，多材料复合材料成功地提高了抗弯性能。以 CFRTP 复合材料层压板为基准，结果显示，在 CFRTP 上包覆 SFP 可使抗弯强度提高 319%，抗弯模量提高 36%。VP/CFRTP 复合材料在断裂时的抗弯应变和比能量吸收分别提高了 103% 和 175%。中性轴（NA）的战略性优化和多材料系统中高模量材料的整合有助于提高性能。使用光学显微镜和扫描电子显微镜（SEM）进行的断裂分析表明，CFRTP 层压板中的异质界面断裂和裂纹扩展是渐进的。结果表明，在多材料结构设计中需要考虑界面失效模式的控制，以达到理想的抗弯强度。

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$Flexural behaviours and heterogeneous interface fracture in overmoulded multi-material thermoplastic composites$

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Flexural behaviours and heterogeneous interface fracture in overmoulded multi-material thermoplastic composites

The development of lightweight multi-material composites is imperative to meet the demands of the aerospace and automotive industries. Thermoplastic-based multi-material composites represent a novel approach, wherein two or more distinct composite materials are combined to create a hybrid material with enhanced performance characteristics. However, varying failure modes across multi-scale interfaces in the composites affect their mechanical performance in a complex manner. In this study, multi-material composites were manufactured through overmoulding of virgin polycarbonate (VP) and short-fibre reinforced polycarbonate (SFP) on continuous fibre-reinforced thermoplastic polycarbonate (CFRTP) laminate to assess behaviours of heterogeneous interfaces and structural performance under flexural loading. In the compression overmoulding process, the consolidation of thermoplastics creates interdiffusion of polymer chains across the multi-material interfaces. The multi-material composites successfully demonstrated enhanced flexural properties compared to single material constituent such as VP, SFP, and CFRTP. Benchmarking with CFRTP composite laminates, results revealed that overmoulding SFP on CFRTP results in 319 % higher flexural strength and 36 % higher of flexural modulus. VP/CFRTP composite offered 103 % more flexural strain and 175 % more specific energy absorption during fracture. Strategic optimization of the neutral axis (NA) and integration of high modulus materials in multi-material systems contributed to such performance enhancements. Failure analysis conducted using optical microscope and scanning electron microscopy (SEM) revealed progressive heterogeneous interface fracture and crack propagation in the CFRTP laminate layer. Results indicated that control of interface failure modes need to be considered in multi-material structure design to achieve desired flexural strength.

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.