【摘要】 目的分析陶瓷基复合材料的结构强度。方法围绕C/SiC陶瓷基复合材料连接结构失效分析问题,提出模量突降和渐进损伤两种分析方法,基于Abaqus软件平台编写UMAT有限元分析子程序,结合试验数据分析多种不同失效准则在陶瓷基复合材料结构强度分析中的适用性。结果基于改进三维Hashin失效准则,针对典型C/SiC复合材料连接结构进行了失效行为计算,获得结构的失效模式与试验结果规律一致,破坏载荷的预测误差在10%以内。结论通过与试验结果的对比分析,验证了两种方法的有效性,研究方法能够为高超声速飞行器、天地往返飞行器复合材料热结构的强度分析提供技术支撑。更多还原

【Abstract】 In order to analyze the stength of ceramic matrix composite strultures. For the failure analysis of C/SiC composite joint structures, two methods of proportion method and progressive damage method were developed. A UMAT finite element analysis subroutine was developed based on Abaqus software platform. The applicability of several different failure criteria was analyzed with experimental data. Based on the improved three-dimensional Hashin failure criterion, the failure behavior of a typical C/SiC composite joint structure was calculated. The failure mode of the structure was consistent with the experimental results, and the prediction error of the failure load was less than 10%. The validity of the two methods is verified by comparing with the experimental results. The research method can provide technical support for the strength evaluation of the composite hot structures for hypersonic aircraft and re-entry space vehicle.更多还原