基于单胞体模型的复合固体推进剂松弛模量衰减过程数值模拟

Numerical Simulations of the Decaying Process of Solid Propellant Relaxation Modulus Based on Single Cell Models

为研究复合固体推进剂松弛模量的衰减,依据复合固体推进剂组分建立单胞体模型。根据复合固体推进剂5%定应变下的松弛模量,利用有限元计算方法和均匀化理论对基体材料的松弛模量进行参数反演。在此基础上,研究了复合固体推进剂单胞体模型在不同定应变水平下的松弛模量,并计算了单胞体模型的拉伸过程。根据Boltzmann叠加原理及广义胡克定律计算了单胞体模型拉伸过程中松弛模量的变化。结果表明,复合固体推进剂松弛模量有明显的应变相关性,并且在拉伸过程中模量的衰减与载荷历程相关。

To research the decrement of solid propellant relaxation modulus, the single cell model isestablished based on the components of a solid propellant. According to the solid propellant relaxationmodulus which obtained under 5% strain load, the binder relaxation modulus is inversed by the FEM andhomogenization theory. On this basis, the relaxation modulus of the solid propellant are studied when thesolid propellant under different strain loads, and the drawing process of the solid propellant is computed.The variation of relaxation modulus in the drawing process of the solid propellant is obtained based on Bo-hzmann superposition principle and the generalized Hooke law. The results show that relaxation modulusof the composite solid propellant is dependent on its strain loads, and the decrement of relaxation modulusis dependent on the loading history in the drawing process.