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损伤形式对三维编织复合材料拉压性能的影响

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Keywords: 复合材料,三维编织,损伤,拉伸性能,压缩性能

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Abstract:

通过对损伤前后三维编织复合材料试件进行纵向拉伸和压缩实验,分析了材料的拉、压刚度和强度的变化规律和失效形式。主要讨论了4种损伤加工方案,包括沿宽度方向单边切割、沿宽度方向双边切割、沿厚度方向单边切割及沿宽度和厚度方向同时切割。实验结果表明,宽度方向损伤对拉伸强度、模量和压缩强度影响不大,压缩模量下降了20%左右;厚度方向损伤对纵向拉伸、压缩强度和模量影响较大。编织角20°时,拉伸、压缩应力-应变曲线接近于线性,试件的失效方式趋向于脆性破坏;编织角35°时,压缩应力-应变曲线表现出一定的非线性。

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