Low-field ¹H NMR tests and uniaxial tensile tests of hydroxyl-terminated polybutadiene (HTPB) films, subjected to a prestrain before the NMR and tensile tests related to the use of the HTPB as coatings for solid rocket motors, were carried out. The mechanisms of the variations of crosslinking density, tensile strength and maximum elongation of the HTPB films with prestrain were analyzed, and a Gaussian function model of the variation of the crosslinking density with prestrain was obtained. By introducing crosslinking density and prestrain as correction coefficients, two prestrain constitutive models of the stress-strain relationship of HTPB films related to the Mooney-Rivlin and Ogden hyperelastic constitutive models, respectively, were established and the parameters of the models were obtained based on nonlinear least squares fitting. The accuracy and effectiveness of the prestrain constitutive models were determined with that based on the Ogden model proven to be of important engineering value.

低场¹进行了预应变之前，在进行NMR和与将HTPB用作固体火箭发动机涂层相关的拉伸测试之前，对羟基封端的聚丁二烯（HTPB）膜进行了1 H NMR测试和单轴拉伸测试。分析了HTPB薄膜随预应变变化的交联密度，拉伸强度和最大伸长率变化的机理，得到了高应变函数的交联密度随预应变变化的高斯函数模型。通过引入交联密度和预应变作为校正系数，分别建立了两个与门尼-里夫林和奥格登超弹性本构模型有关的HTPB薄膜的应力-应变关系的预应变本构模型，并基于非线性获得了模型的参数。最小二乘拟合。