Study on Theoretical Prediction Method of PBXs Uniaxial Tensile Compressive Strength Ratio based on Microcrack Model

Abstract

Strength is an important characteristic of material mechanical properties. Based on the microcrack model and considering the internal friction effect between the crack surfaces, the uniaxial tensile and compressive strength theoretical model which can reflect the tensile and compressive anisotropy of materials is derived and established by using the crack initiation criteria of maximum circumferential stress and maximum circumferential strain, considering the internal friction coefficient and Poisson’s ratio. By introducing the TATB based PBXs parameters, the tension compression ratio of PBXs calculated by using the maximum circumferential stress and strain criteria are 0.293 and 0.471 respectively, with errors of -10% and 44% respectively compared with the experimental value of 0.326; The calculated failu re angles are 29.52 ° and 19.44 ° respectively. Compared with the experimental values of 24 ° and 30 ° (average 27 °), the errors are 9% and -28%, respectively. The analysis shows that the maximum circumferential stress criterion is more suitable for the construction of PBXs strength criterion based on microcrack model.