Research on Mechanical Behavior of 2D C/SiC Composites at Elevated Temperature Under Uniaxial Compression
Research on Mechanical Behavior of 2D C/SiC Composites at Elevated Temperature Under Uniaxial Compression
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发表时间：
2010
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通讯作者：
Liu Ming-shuang
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作者：
Liu Ming-shuang
采用电子万能试验机和分离式霍普金森压杆，研究了一种二维C/SiC复合材料在293K ~ 873K范围内的准静态和动态压缩力学行为。实验结果表明，该材料在高温条件下仍具有良好的承载能力。复合材料在873K时的抗压强度仅比293K时降低10%。准静态和动加载均未观察到突变脆性破坏。通过分析发现，高温下2D C/SiC复合材料承载能力下降的原因可能有两个：一是由于导热系数不同导致的两相之间的残余应力，二是氧化的影响，这被认为是2D C/SiC复合材料高温软化行为的更主要原因。
The quasi-static and dynamic compression mechanical behaviors of a kind of 2D C/SiC composite were investigated at temperatures ranging from 293K to 873K using the electronic universal testing machine and the split Hopkinson pressure bar.The experimental results show that the material still has a good carrying capacity even at the elevated temperature.The compressive strength of the composite at 873K decreases by only 10% comparing with that at 293K.The catastrophic brittle failures were not observed under both quasi-static and dynamic loading.It has been found through analysis that the decrease in carrying capacity of 2D C/SiC composite at elevated temperature is probably due to two reasons: the first one is the residual stress between the two phases because of the different coefficient of heat conductivity,and the second one is the effect of oxidation,which is considered as the more dominating reason of the softening behavior of 2D C/SiC composite at elevated temperatures.