丁羟包覆层的黏超弹本构模型

为了准确地描述丁羟（HTPB）包覆层在有限变形下的拉伸力学特性，研究了HTPB包覆层的黏超弹本构模型。分别构建了含率相关函数的本构模型和并联式本构模型，前者由超弹模型与率相关项相乘得到，后者由超弹模型与含损伤因子的黏弹模型并联而成。进行了HTPB包覆层的单步松弛、多步松弛和不同速率的单轴拉伸试验，并将试验数据用于拟合模型参数。结果表明，HTPB包覆层对应变率极其敏感，且具有很大的延伸率，表现出明显的黏超弹特性；两种模型均能很好地预测HTPB包覆层较大形变范围内的拉伸力学性能，其中含率相关函数的模型的描述更加准确，其研究具有重要的军事意义。

Visco-hyperelastic constitutive model of hydroxyl-terminated polybutadiene inhibitor

The visco-hyperelastic constitutive models of hydroxyl-terminated polybutadiene (HTPB) inhibitor were studied to describe the tensile mechanical properties accurately under finite deformation. Visco-hyperelastic constitutive model with rate related function and parallel constitutive model were built respectively, and the first model was multiplicatively combined by hyper-elastic model and rate related function, while the latter model was parallelly formed by hyper-elastic model and viscoelastic model containing damage factor. In order to fit the model parameters by the test data, the single-step relaxation test, multi-step relaxation test and uniaxial tensile test at various rates of HTPB inhibitor were undertaken. The results show that HTPB inhibitor is extremely sensitive to strain rate and has a great elongation, reflecting the obvious visco-hyperelasticity. Both of the models are able to predict the tensile mechanical properties of HTPB inhibitor in a large deformation range, meanwhile the model with rate related function can describe the mechanical properties more precisely, which is of great military significance.