对两种致密度的2D-C/SiC复合材料进行了层向动态压缩性能试验研究,两种致密度材料通过控制CVI(Chemical vapor infiltration)工艺参数得到.试验在SHPB装置上进行,使用改变波形整形器几何尺寸的方法基本实现恒应变率加载.试验结果表明:动态压缩应力-应变曲线呈明显的非线性,与静态试验相比两种致密度试样均有一定的应变率强化效果,即随着应变率的增加,抗压强度提高,失效应变减小,剪切损伤角增大.致密度提高后抗压强度明显增加但失效应变减小,且表现出脆性特征,剪切损伤角也明显增大.动态试验数据有较大的分散性,低、高致密度试样动态破坏强度的Weibull分布系数分别为8.36和5.27.SEM观察发现,低致密度试样纤维束断口不平整,高致密度试样断口相对平整;纤维束多发生整束剪断,动态条件下纤维破碎多于静态.
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