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- 2017
二维C/SiC复合材料在冲击拉伸下的损伤过程
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Abstract:
利用分离式霍普金森拉杆实验装置（SHTB）和超高速照相机，对二维C/SiC复合材料进行了冲击拉伸力学性能实验研究，同时结合其宏观力学行为，分析了在冲击拉伸载荷作用下的损伤破坏过程。结果表明：材料的应力-应变曲线呈明显的非线性特征，其内部损伤破坏和裂纹扩展过程分为四个阶段：损伤积累于第一阶段，裂纹起源于第二阶段，屈服失效于第三个阶段，快速扩展于第四个阶段。 The dynamic tensile properties of 2D C/SiC composites were investigated by means of Split Hopkinson Tensile Bar (SHTB) and ultra high-speed camera.Based on its macro mechanic behavior,the failure process of the specimen under dynamic tensile loading was analyzed.The experimental results indicate that the stress-strain curve is obviously non-linear,and examination of the failure process of the specimen helps define the four phases of crack propagation,namely,the damage accumulation phase,crack initiation phase,yield failure phase and crack fast spreading phase. 国家自然科学基金青年项目（11402302）；陕西省自然科学基金（2016JQ1031）；中国博士后科学基金（2016M592923）
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