Effect of interface behaviour on damage and instability of PBX under combined tension-shear loading

作     者：Quan-zhi Xia Yan-qing Wu Feng-lei Huang Quan-zhi Xia;Yan-qing Wu;Feng-lei Huang

作者机构：State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing100081PR China 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2023年第23卷第5期

页      面：137-151页

核心收录：

学科分类：082604[工学-军事化学与烟火技术] 08[工学] 0826[工学-兵器科学与技术] 

基　　金：the China National Nature Science Foundation (Grant No. 11872119) China Postdoctoral Science Foundation (Grant Nos. BX20200046, 2020M680394) Pre-research Project of Armament (Grant No. 6142A03202002) for supporting this project 

主　　题：PBX explosives Interface behaviour Damage Instability Crack propagation 

摘      要：To study the effect of interface behaviour on the mechanical properties and damage evolution of PBX under combined tension-shear loading, the present work establishes the numerical model of a PBX three-phase hybrid system, which introduces a nonlinear plastic damage cohesion model to study the mechanical response and damage process. The parameters in the model were fitted and *** the crack growth rate as the feature, the damage state in each stage was determined, and the damage instability criterion was given. The effects of interfacial tensile strength and shear strength on the damage process of PBX were studied. On this basis, serrated and hemispherical structures interface of PBX has been developed, which affects the damage process and instability during the loading *** results indicate that damage state response of PBX experiences the process of stable load bearing,unstable propagation, and complete failure. At the critical moment of instability, the overall equivalent effective strain of material reaches 3024 με and instability loading displacement reaches 0.39 mm. The increase of interfacial tensile strength and shear strength significantly inhibits the damage of PBX. The effect of interfacial shear strength on critical instability of PBX is approximately 1.7 times that of the interfacial tensile strength. Further, interface opening along the normal direction is the main damage form at the interface. Serrated and hemispherical rough interfaces can significantly inhibit propagation of cracks, and the load bearing capacity is improved by 22% and 9.7%, respectively. Appropriate improvement of the roughness of the interface structure can effectively improve the mechanical properties. It is significantly important to have a better understanding of deformation, damage and failure mechanisms of PBX and to improve our predictive ability.