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首页> 美国卫生研究院文献>Materials >High Temperature Mechanical Response and Failure Analysis of 3D Five-Directional Braided Composites with Different Braiding Angles
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High Temperature Mechanical Response and Failure Analysis of 3D Five-Directional Braided Composites with Different Braiding Angles

机译：不同编织角度的3D五向编织复合材料的高温力学响应和失效分析

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摘要

Three-dimensional (3D) five-directional braided composites are extensively applied in aeronautics and national defense due to their integrity and structural superiorities. In this paper, 3D five-directional braided carbon/epoxy composites were manufactured, and the high temperature mechanical response and failure mechanisms of composites with braiding angles of 21° and 32° were studied. The out-of-plane compression tests of composites with different braiding angles were conducted at temperatures ranging from 25 °C to 180 °C. Then compression stress–strain curves, compression mechanical response, and failure modes of composites at high temperatures were analyzed and compared. The results show that compression stress–strain curves linearly increased at the initial stage and dropped at various degrees at different temperatures for composites with different braiding angles. The temperature and braiding angle were both important parameters affecting out-of-plane compression properties of 3D five-directional braided composites. Mechanical properties decreased with increasing temperature for both 21° and 32° specimens. Moreover, composites with a small braiding angle possessed higher properties at each temperature point. The morphologies manifested that the failures were a symmetric ±45° shear crack for 21° specimens and a thorough 45° shear crack for 32° specimens, and a 45° fracture weakened with increasing temperature.
机译：三维（3D）五向编织复合材料由于其完整性和结构优势而广泛应用于航空和国防。本文制备了3D五向编织碳/环氧复合材料，研究了编织角为21°和32°的复合材料的高温力学响应和破坏机理。在25°C至180°C的温度范围内进行了具有不同编织角度的复合材料的面外压缩测试。然后分析并比较了高温下复合材料的压缩应力-应变曲线，压缩机械响应和破坏模式。结果表明，对于不同编织角度的复合材料，压缩应力-应变曲线在初始阶段线性增加，在不同温度下以不同程度下降。温度和编织角都是影响3D五向编织复合材料的面外压缩特性的重要参数。对于21°和32°的试样，机械性能均随温度升高而降低。而且，编织角小的复合材料在每个温度点都具有较高的性能。形貌表明，破坏是21°试样对称的±45°剪切裂纹，而32°试样则是彻底的45°剪切裂纹，并且45°的断裂随温度升高而减弱。

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