Establishment and Analysis of Fracture Strength Prediction Model for PBX under Temperature-Defect Coupling Effect
By introducing the inherent equivalent defect parameter a*as a correction parameter into the classical linear elastic fracture mechanics model(LEFM),a predictive model for the fracture strength of polymer bonded explosives(PBX)with different depth surface cracks has been successfully established and applied to typical polymer bonded explosives LX-17 and PBX-9502 to study the fracture behavior of PBX and its variation with temperature.The results show that the established fracture strength prediction model can achieve accurate and unified description of the fracture criteria for both flaw-free and flawed specimens.A fracture toughness testing scheme and calculation method based on samples without prefabri-cated cracks and with arbitrary depth cracks are proposed,which can significantly reduce the requirements for sample quantity and prefabricated crack depth.Additionally,the temperature effect on the fracture strength of PBX is explored,and the strength prediction under temperature-defect coupling conditions is achieved by combining the PBX fracture strength model.This study provides theoretical support and practi-cal guidance for evaluating the fracture performance of PBX under temperature-defect coupling conditions.
万方数据
维普
