三维编织C/SiC复合材料的拉压实验研究

针对三维编织C/SiC复合材料进行了拉伸试验和压缩试验,得到了材料拉伸、压缩的主要力学性能参数、损伤发展情况及破坏规律。从宏观角度比较了在两种载荷下材料弹性性能及强度的区别,得到了一些试验研究结论。结果表明:三维编织C/SiC在拉伸和压缩载荷下的应力-应变曲线有明显的非线性特性;拉伸模量低于压缩模量;拉伸强度高于压缩强度;声发射数据可以用来检测材料内部损伤的发展。

TENSILE AND COMPRESS EXPERIMENTAL INVESTIGATION OF THREE-DIMENSIONALLY BRAIDED C/SiC COMPOSITES

For three-dimensionally braided C/SiC composites,the tensile and compress experiments were carried out to get main mechanical characters, damage development and failure mechanisms under tensile and compress loads. The elastic properties and failure characters under two kinds of loads were compared and some experimental conclusions were deduced. It can be concluded from the stress-strain curves of the test that the damage development in three-dimensionally braided C/SiC composite specimens is continuous. The test results also reveal that the tensile modulus is less than the compress modulus and the tensile stress is greater than the compress stress. The acoustic emission data can reveal the damage development in C/SiC specimens.