Effects of Z-pin on moisture absorption property and damage mode under flexural load for carbon fiber composite

IF 1.9 4区材料科学 Q3 Materials Science Science and Engineering of Composite Materials Pub Date : 2022-01-01 DOI:10.1515/secm-2022-0020

Yansheng Fan, Min Li, Yizhuo Gu, Shaokai Wang, Yanjie Wang

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Abstract

Abstract The effect of carbon fiber Z-pin on carbon fiber composite under moisture condition with and without flexural load was investigated in this work. Moisture absorption property and crack propagation of carbon fiber reinforced epoxy matrix composite and Z-pinned composite were evaluated under moisture only and moisture-coupled load conditions. The moisture property was evaluated by moisture content and microscopic morphology obtained using X-ray micro-computed tomography (X-ray μCT). The microstructures inside composites and Z-pinned composites after moisture conditions and three-point flexural test were detected using X-ray μCT and optical microscope. It illustrates that the moisture content of Z-pinned composites is higher due to the rich-resin pocket brought by the implantation of Z-pin. The cracks are obvious inside Z-pinned composites after moisture-coupled load conditions. It is attributed to the implantation of each pin which is the weak point for stress concentration and crack formation. Failure morphologies on the surface of composites and Z-pinned composites are different under different moisture conditions. Less macro-interlayer cracks are detected on the surface of Z-pinned composites, and plenty of microcracks initiating from pins are observed.

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Z-pin对碳纤维复合材料吸湿性能及弯曲载荷下损伤模式的影响

摘要本文研究了碳纤维z轴销对碳纤维复合材料在受潮和无弯曲载荷条件下性能的影响。研究了碳纤维增强环氧基复合材料和z形钉接复合材料在纯湿载荷和湿耦合载荷下的吸湿性能和裂纹扩展特性。通过x射线微计算机断层扫描(x射线μCT)获得的水分含量和微观形貌来评价其水分性能。采用x射线μCT和光学显微镜对复合材料和z -钉接复合材料在受潮和三点弯曲试验后的内部组织进行了检测。结果表明，由于Z-pin的注入带来了丰富的树脂袋，使得Z-pin复合材料的含水率更高。湿耦合载荷作用下，z -钉接复合材料内部裂纹明显。这是由于每个销的植入是应力集中和裂纹形成的薄弱环节。在不同水分条件下，复合材料和z -钉接复合材料表面的破坏形态不同。z -钉接复合材料表面宏观层间裂纹较少，但有大量的微裂纹是由钉接引起的。

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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.