The effect of tear straps on compressive carrying capacity of composite omega single-stringers

Abstract

In this paper, the progressive failure analysis method is used to analyze suppression effect and mechanism of tear straps, and study the effect of tear straps with varying coverage on compressive carrying capacity of composite omega single-stringers. Based on ABAQUS, several omega single-stringers with common, half-inclusive and all-inclusive configuration are established. Buckling and post-bucking processes of single-stringers subjected to axial compressive load are analyzed. Hashin failure criterion and Camanho model are adopted, respectively, as the failure criterion and degradation model of materials. Cohesive model is used to simulate the bonding interface. The results show that by strengthening the local stiffness of the stringer and skin, tear straps resist the local buckling deformation and control the occurrence and range of damage induced by local buckling, hence preventing the reduction of the carrying capacity. The all-inclusive configuration is more effective than half-inclusive. The conclusions obtained show that tear straps can improve overall stiffness and load-carrying capacity and the all-inclusive configuration has a higher effect than the half-inclusive configuration. Tear straps play a vital role in improving the carrying capacity of structures.