Study on the effect of high temperature on the mechanical properties of composites plates containing initial defects

Abstract

Abstract In this study, against the background of the high temperature environment faced by hypersonic vehicles, an in-depth study is carried out to investigate the influence of temperature on the mechanical properties of reinforced wall plates of composites containing initial defects. First, the in-plane shear mechanical property data and failure morphology of two groups of specimens of T1100/5405 composites at different test temperatures (25°C, 150°C) were obtained through experimental tests. The tests show that high temperature accelerates the damage failure process of the wall plate structure, the shear capacity of the wall plate is weakened, and the ultimate load decreases by 26.06%. Secondly, a numerical model based on the CZM and the CDM of the composite is established, and the accuracy of the model is verified by combining with the test results. The work carried out in this paper has certain engineering application value for the design of composite structures for hypersonic vehicles.