Study on Fracture Behavior of the Brazilian Test of PBX Explosives Based on XFEM

In order to investigate the effects of different loading methods in the Brazilian test on indirect tensile mechanical behavior of PBX explosives,the deformation,damage and failure process in the Brazilian test,the arc Brazilian and the rubber-cushion Brazilian tests were simulated by using extended finite element method(XFEM).The distribution of displacement and stress were obtained.The effects of different loading methods on mechanical response,deformation and fracture were analyzed.The results show that the fracture path and the distribution of displacement and stress agree well with the experimental and analytical values.Compared with the Brazilian test,the arc Brazilian test and the rubber-cushion Brazilian test can reduce contact stress and help to prevent the generation of secondary cracks.It indicates that the rubber-cushion Brazilian test is better for measuring the tensile strength of PBX.