Transverse mechanical properties of plain woven fabric composites
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摘要: 通过对平纹织物复合材料的横向拉压试验, 分析了产生各种破坏现象的微观机理。横向压缩过程中,在与水平面成45°方向剪切破坏的同时还出现层间裂纹。由于两个方向上纱线的弯曲程度不同, 破坏形式有很大差异, 不同自由边处的纱线界面存在不同程度的剪切破坏, 并表现出不同的边缘效应。借助显微镜观察和基于代表体积单元的数值模拟对这些现象进行了分析, 发现高度不均匀的内部波纹纱线结构在横向压缩下产生的层间剪切应力是出现横向裂纹的主要原因。Abstract: The breakage micro-mechanism of plain-woven fiber reinforced composite materials was studied by meansof t ransverse compressive and tensile experiment s. It is observed that the shear damage along 45°with the fill st randoccurs together with interlaminar cracks during the process of t ransverse compression. The damage forms of warpst rand and fill st rand are different because of the curve diversity , and the st rand interfaces and laminar interfaces atf ree-edges show different shear failures. The differences among failure models are due to the different bendingshapes of st rands. These phenomena were analysed through microscope observation and numerical simulation. Somepossible reasons were given to explain these failure forms. The main reason may be that the interlaminar shear st ressis induced by highly anomalous st rand st ructure under t ransverse compression.
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