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端羟基聚丁二烯(HTPB)推进剂在拉伸过程中裂尖存在一个明显的非线性粘聚区,粘聚区本构模型的精度影响着推进剂装药裂纹起裂和扩展过程的数值仿真结果。为了准确地获得HT-PB推进剂的粘聚区本构模型,建立了基于实验的反演识别方法,该方法通过实验获取粘聚区断裂能和断裂强度参数,使用有限元模型更新方法得到粘聚区本构曲线形式参数。将获得的本构模型应用于裂纹起裂和扩展过程仿真,研究结果表明所建立的粘聚区本构参数获取方法简单可行;所获得的粘聚区本构参数可以准确地模拟出HTPB推进剂裂纹起裂和扩展过程。
In the process of drawing, hydroxyl terminated polybutadiene (HTPB) propellants show a distinct nonlinear cohesive zone at the crack tip. The accuracy of the constitutive model of cohesive zone affects the numerical values of propellant charge cracking initiation and propagation Simulation results. In order to accurately obtain the constitutive model of cohesive zone of HT-PB propellant, an experiment-based inversion and identification method was established. The fracture energy and fracture strength parameters of cohesive zone were obtained experimentally. The finite element model updating method was used to obtain the viscosity Zone Constitutive Curves Parameters. The obtained constitutive model is applied to the simulation of crack initiation and propagation. The results show that the method for obtaining constitutive parameters of cohesive zone is simple and feasible. Constitutive parameters of cohesive zone can accurately simulate HTPB propellant Crack initiation and propagation.