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采用实验与反演相结合的方法构建了端羟基聚丁二烯(HTPB)推进剂/衬层界面的率相关的内聚力模型.采用改进的单搭接试件完成了HTPB推进剂/衬层界面的断裂实验研究,采用内聚力单元方法对单搭接试件进行了数值研究,结合基于Hook-Jeeves优化算法的反演识别程序,获取了不同加载率下的界面断裂参数.由于界面断裂参数具有明显的率相关性,通过构建率相关的损伤函数,构建了基于双线性内聚力模型的率相关HTPB推进剂/衬层界面Ⅱ型内聚力模型.模型预测结果和实验结果的对比相关系数大于99%,说明本文所建立的率相关内聚力模型具有较高的准确性,能够准确描述加载率为5~200mm/min时推进剂/衬层界面的断裂性质.
A cohesive force-dependent cohesion model of HTPB propellant / liner interface was constructed by a combination of experimental and inversion methods.The HTPB propellant / liner interface , The cohesion element method is used to study the single lapped specimens, and the interfacial fracture parameters under different loading rates are obtained by combining with the identification program based on Hook-Jeeves optimization algorithm.As the interfacial fracture parameters are obvious Rate correlation HTPB propellants / liner interface type Ⅱ cohesion model based on the bilinear cohesion model was constructed by constructing the rate-dependent damage function.The correlation coefficient between model prediction and experimental results was greater than 99% This indicates that the rate-related cohesion model established in this paper has high accuracy and can accurately describe the fracture properties of the propellant / liner interface at loading rates of 5-200 mm / min.