平纹编织C/SiC材料复杂应力状态的力学行为试验研究  

EXPERIMENTAL INVESTIGATION ON PLAIN WOVEN C/SiC COMPOSITES UNDER COMPLEX STRESS STATES

作　　者：王翔[1] 王波[1] 矫桂琼[1] 常岩军[1] 

机构地区：[1]西北工业大学工程力学系,西安710072

出　　处：《机械强度》2010年第1期35-39,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(90405015)~~

摘　　要：利用Arcan夹具,实现对2D平纹编织C/SiC复合材料拉剪、压剪加载试验,研究材料在复杂应力状态下的力学行为,分析材料的损伤演化和失效模式。试验结果表明,材料在拉剪复杂应力状态下不同角度的应力—应变曲线呈现非线性关系;在压剪复杂应力下,随着加载角度增大,应力—应变曲线非线性程度增大。断口分析表明纯剪切形成平齐断口,受拉应力影响材料在拉剪复杂应力状态下形成斜断口。试验分析表明,适当的压应力能提高抗剪切破坏能力。偏移型椭圆失效判据与试验值吻合较好,该失效判据能较好地描述材料在复杂应力状态下的破坏行为,能较好反映材料的强度特征。The damage mechanical and failure model of C/SiC composite material were investigated under the mixed stress states. The experimental results based on the ,Arcan fixture tests indicate that the overall stress-strain curve show nonlinear under the tensile loading. And the stress-strain curves become more nonlinear under the compress loading. The sample fracture picture indicates that that there is a shear forms fiat fracture. According to the strengths of the specimens under the complex stress state, a quadratic equation was suggested to be able to describe the mixed failure criteria of the materials. The failure equation can agree good with the failure criteria fixed the experimental results.

关 键 词：陶瓷基复合材料(CMCs) 平纹编织 Arcan夹具 力学行为 

分 类 号：TB332[一般工业技术—材料科学与工程] O343[理学—固体力学]