受剪载荷下C/SiC铆接接头应力数值模拟与实验验证

Numerical Stimulation and Experimental Validation of Stress in C/SiC Riveted Joints under Shear Load

摘要:

通过建立有限元模型研究C/SiC铆接接头剪切应力分布及接头剪切破坏形式，并采用实验的方法对模型的准确性进行验证。计算结果表明：按本研究方案尺寸设计的C/SiC铆接接头受剪切载荷时，应力分布合理，以铆钉被剪断的方式破坏。实验验证中所有接头以铆钉被剪断的形式破坏，断口出现在连接板内侧，与计算结果一致，说明本研究所建立的计算分析C/SiC铆接接头的破坏形式的模型是合理的。

Abstract:

The stress concentration and fracture form of C/SiC riveted joints under shear load were investigated by using a FEM model and its accuracy was validated by experiments. The calculation results show that the stress concentration in C/SiC riveted joints is reasonable under shear load and the riveted joints in given size will be damaged in shear fracture form. All riveted joints are damaged in shear fracture form in the experimental validation. All of the starting fracture points occur at the inner of junction plates, which demonstrates that the established model for analysis of fracture form of C/SiC rivet is correct.