C／C复合材料压缩破坏的应变率效应研究  

Strain Rate Sensitivity of C/C Composites under Compression

作　　者：袁秦鲁[1] 李玉龙[1] 李贺军[2] 李淑萍[2] 郭领军[2] 

机构地区：[1]西北工业大学航空学院,西安710072 [2]西北工业大学材料科学与工程学院,西安710072

出　　处：《无机材料学报》2007年第2期311-314,共4页Journal of Inorganic Materials

基　　金：国家自然科学基金(90405016)

摘　　要：利用电子万能试验机与整形修正的Split Hopkinson Pressure Bar(SHPB)研究了碳布叠层／碳复合材料在四种不同应变率下的压缩性能,对其在准静态、动态载荷下的压缩破坏机理进行了初步的探讨．研究结果表明: C／C复合材料的压缩破坏强度具有较强的应变率效应,与准静态(10-4／s)相比,复合材料的动态(1．5×102／s)压缩强度可提高70％左右;复合材料在准静态、动态载荷下力学性能的差异可归结为纤维与基体界面特性的应变率效应以及不同应变率下破坏模式的不同．To understand the strain rate sensitivity of compressive strength of carbon clothe/carbon （C/C） composites, quasi-static and dynamic compressive experiments were conducted in its x-y plane by means of electric universal test machine and Split Hopkinson Pressure Bar with pulse shapers. The experimental results show that the dynamic compressive fail strength of C/C composites has strong stain rate sensitivity and it increases with strain rate. Compared with the quasi-static compression, the dynamic compressive strength is higher by 70% or so. Meanwhile, the samples are failed by shearing under quasi-static loading, and by crushing under dynamic loading. The different mechanical behaviors from the experimental results indicate that it may be related to the strain rate sensitivity of interfaces characteristic of C/C composites and the change of the failure modes.

关 键 词：C/C复合材料 动态压缩 应变率效应 

分 类 号：TB332[一般工业技术—材料科学与工程]