关键词: 混杂复合材料, 机械连接, 失效载荷, 失效模式, 渐进损伤分析

Abstract: The failure load, failure mode, and progressive damage processes of carbon-glass hybrid composite bolted connection structures were studied by using the method of experiments and numerical simulations. Based on the ABAQUS platform, the finite element models of 36 different types of connection structures with various width to diameter ratios(W/D) and end to diameter ratios(E/D) were established. According to the three-dimensional Hashin failure criterion and Chang-Chang failure criterion, the effects of structural dimensions E/D and W/D on the failure load and failure mode were analyzed, combined with the findings of the tensile tests. The impacts of E/D and W/D on the failure load and failure mode of the connection structures and the progressive damage processes of the connection structures under various failure modes were discussed. The results show that the failure modes of the carbon-glass hybrid composite bolted connection structures with a specific hybrid ratio include bearing failure, shear-bearing failure, and tensile failure. The structural dimensions E/D and W/D have a greater impact on the failure load and failure mode. The bearing failure mode of the connection structures is that the matrix of the laminated plates are damaged at the axis position on the extruding side of the bolt holes, and the failure extends outward in a sector shape along the axis to the structure failure. The shear-bearing failure mode is that a large number of fiber and matrix tensile damage occur from the bolt holes to the end face of the laminated plates, with the matrix bearing damage at the compression side of the bolt holes, generating a notch to the structural failure. The tensile failure mode is that the fiber and matrix tensile damage occurs at the upper and lower positions of the bolt holes of the laminates, and extends laterally to the upper and lower sides of the laminates, resulting in structural failure.

Key words:  , hybrid composite, mechanical connection, failure load, failure mode, progressive damage analysis