三维针刺C/SiC复合材料动态压缩力学行为研究
首发时间:2011-01-10
摘要:利用电子万能实验机及Hopkinson压杆对三维针刺碳纤维增韧的碳化硅复合材料进行了应变率为10-4 至6.5 103 1/s的单轴压缩力学性能测试。实验结果表明三维针刺C/SiC复合材料具有略微的应变率敏感性,材料破坏时并未表现出典型的脆性破坏,而是在应力达到破坏强度时出现了显著的应变软化,在经历了较大的变形后才最终破坏,这表明三维针刺C/SiC复合材料沿厚度方向针刺的碳纤维有助于提高材料的韧性。由于材料缺陷,动态压缩强度分布遵循Weibull分布。对压缩断口借助扫描电镜观察发现:材料的失效模式随着应变率变化而发生改变。
关键词: 固体力学 陶瓷基复合材料 Hopkinson杆系统 动态压缩 Weibull分布
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Investigation on mechanical behavior of 3D needle-punched C/SiC composites under high strain rates
Abstract:The compressive mechanical behavior of a 3D needle-punched C/SiC composite at room temperature was investigated at strain rate ranging from 10-4 to 6.5 103 1/s. The experimental results show the strain rate has slight influence on the mechanical property of the material. The dynamic compression strength obeys the Weibull Distribution. SEM images of the fracture surface of the specimen tested at various strain rates indicate that the failure pattern of the material also varies with the strain rate applied.
Keywords: Mechanic of solid ceramic matrix composite Hopkinson bar system Dynamic compression Weibull distribution
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