CAJ | 학술논문

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.
이용Arcan협구,실현대2D평문편직C/SiC복합재료랍전、압전가재시험,연구재료재복잡응력상태하적역학행위,분석재료적손상연화화실효모식.시험결과표명,재료재랍전복잡응력상태하불동각도적응력-응변곡선정현비선성관계;재압전복잡응력하,수착가재각도증대,응력-응변곡선비선성정도증대.단구분석표명순전절형성평제단구,수랍응력영향재료재랍전복잡응력상태하형성사단구.시험분석표명,괄당적압응력능제고항전절파배능력.편이형타원실효판거여시험치문합교호,해실효판거능교호지묘술재료재복잡응력상태하적파배행위,능교호반영재료적강도특정.
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 flat 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.