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三维机织碳/碳复合材料双轴压缩载荷下的力学行为

, PP. 206-211

Keywords: 碳/碳复合材料,三维机织,力学行为,双轴压缩,破坏机制

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Abstract:

基于三维机织碳/碳复合材料的细观结构特征,设计平板十字形试样,在材料双轴力学性能试验机上开展了复合材料单轴、双轴加载压缩试验,对比分析了三维机织碳/碳复合材料在双轴压缩载荷下的力学行为。研究表明:三维机织碳/碳复合材料的压缩行为表现为非线性、脆性断裂;双轴载荷作用下非线性特征更为显著,压缩模量随应力的增加而增大,强度与模量相较于单轴有较大幅度增加,双轴压缩载荷作用下材料的强化效应显著;试样破坏位置并未出现在试样中心区,而是发生在试样的加载端部或十字形试样的加载分枝根部,主要表现为基体开裂、纤维断裂和层间脱粘,碳布及其层间界面剪切强度的强弱直接影响材料的压缩强度。

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