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为了预测推进剂药柱中裂纹的起裂和扩展过程,建立了HTPB推进剂的粘聚区本构模型和数值仿真方法。粘聚区本构模型参数分别使用单边裂纹拉伸实验、单轴拉伸实验和数值仿真的方法获取。在有限元分析软件ABAQUS基础上开发出粘结单元,建立了模拟复合型裂纹扩展的嵌入粘结单元方法。进行了复合裂纹试样拉伸实验,获得了裂纹扩展路径和载荷时间曲线,同时用数值仿真方法对结果进行了预测。通过仿真和实验结果对比发现,所建立的粘聚区模型可完整地模拟出HTPB推进剂的失效过程;嵌入粘结单元的方法可准确地预测复合型裂纹的扩展路径。
In order to predict the initiation and propagation of cracks in propellant grains, the constitutive model and numerical simulation method of cohesive zone of HTPB propellant were established. The parameters of cohesion zone constitutive model were obtained by unilateral crack tensile test, uniaxial tensile test and numerical simulation respectively. Based on the finite element analysis software ABAQUS, the bonding unit was developed, and the method of embedded bonding unit to simulate the composite crack growth was established. The tensile test of the composite crack specimen was carried out, the crack propagation path and the load time curve were obtained, and the numerical simulation method was used to predict the results. The simulation results show that the established cohesive zone model can completely simulate the failure process of HTPB propellants, and the method of embedded bonding unit can accurately predict the propagation path of composite crack.