3D C/SiC复合材料拉伸性能的声发射研究

复合材料学报, 2010, 27(6): 82-87.

3D C/SiC复合材料拉伸性能的声发射研究

常岩军 ^1, , 矫桂琼 ^2, , 张克实 ^3, , 王波 ^4,

1.西北工业大学,力学与土木建筑学院,西安,710072

2.西北工业大学,力学与土木建筑学院,西安,710072

3.广西大学,土木建筑工程学院,南宁,530004

4.西北工业大学,力学与土木建筑学院,西安,710072

基金项目: 国家自然科学基金(90405015;90815001;10902025) 中国博士后科学基金(20090460839)

关键词： C/SiC复合材料 , 损伤演化 , 纤维簇断裂 , 声发射 , Filicity效应

Investigation on tensile properties for 3D C/SiC composites by acoustic emission

采用声发射平均频率和相对能量以及幅值识别了3D C/SiC复合材料的拉伸损伤模式,探讨了拉伸加卸载过程中材料的费利西蒂(Felicity)效应.通过分析具有不同拉伸性能试样的损伤过程,研究了不同损伤模式的时间分布特征对材料拉伸性能的影响关系.分析结果表明,3D C/SiC复合材料中基本不存在凯瑟(Kaiser)效应,Felicity比随着应力水平的升高而降低,相对应力水平高于65%时出现突降.3D C/SiC复合材料高性能的决定性因素不是声发射波击总数,而是高幅高能量信号发生的时间和次数.在加载前期(应变

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3D C/SiC复合材料拉伸性能的声发射研究

Investigation on tensile properties for 3D C/SiC composites by acoustic emission

参考文献