Compression shear properties of bonded-bolted hybrid single-lap joints of C/C composites at high temperature

Abstract

Based on previous research, in this paper, the compressive shear failure behavior and mechanical properties of bonded-bolted hybrid single-lap joints ofC/Ccomposites at high temperature were studied. The compression shear test was performed on the joints at 800 °C to obtain the load-displacement curve and failure morphology. The failure modes of joints were observed by digital microscopy and scanning electron microscopy. A numerical analysis model was implemented in finite element code Abaqus/Explicit embedded with the user material subroutine (VUMAT). The numerical results were compared with the test results to verify the correctness of the model. The interrelationship of the compression shear loading mechanism and the variations in stress distribution between bonded joints and bonded-bolted hybrid joints at high temperature were explored. The progressive damage of hybrid joints and the variations in the ratio of the bolt load to the total load with displacement were obtained.