Damage mechanisms of bismaleimide matrix composites under transverse loading via quasi-static indentation

IF 1.9 4区材料科学 Q3 Materials Science

Science and Engineering of Composite Materials Pub Date : 2023-01-01 DOI:10.1515/secm-2022-0181

H. Dong, Xiaogang Li, Yueteng Li, Huanghai Qian, Zhengtao Su

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引用次数: 0

Abstract

Abstract With the application of carbon fiber reinforced plastics (CFRPs), the damage behaviors and mechanisms are desirable to understand. In this work, the Bismaleimide (BMI) matrix composites were employed to study the damage mechanism under transverse loading through quasi-static indentation, where optical microscopy, ultrasonic C-scan, and scanning electron microscope were subjected to examine the damaged regions. The results show that cracks first take place in a resin-rich interlaminar region before the loading reached to a threshold value. Then, the cracks would develop into intralaminar cracks in the fiber bundle region consisting of the shear and bending cracks. Subsequently, the cracks randomly extend to adjacent plies and result in delamination. Finally, the back surface of composites presents a remarkable ply splitting and fiber breakage under increasing loading. Furthermore, conical-shaped indentation patterns in cross-sectional and the undamaged zone under the indenter suggest the BMI matrix composites possess potential applications in engineering materials with a superior stress-releasing structure.

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双马来酰亚胺基复合材料在准静态压痕横向载荷下的损伤机理

随着碳纤维增强塑料(CFRPs)材料的应用，其损伤行为和机理已成为人们迫切需要了解的问题。采用准静态压痕法研究了双马来酰亚胺(BMI)基复合材料在横向载荷作用下的损伤机理，采用光学显微镜、超声c扫描和扫描电镜对损伤部位进行了观察。结果表明:在加载达到一定阈值之前，裂纹首先在富含树脂的层间区发生;然后，裂纹在纤维束区域发展为层内裂纹，由剪切和弯曲裂纹组成。随后，裂缝随机扩展到相邻层，导致分层。最后，随着载荷的增加，复合材料背面出现了明显的层裂和纤维断裂现象。此外，压头横截面和未损伤区域的锥形压痕模式表明，BMI基复合材料具有优异的应力释放结构，在工程材料中具有潜在的应用前景。

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.