固体推进剂可靠性的一种有限元分析方法

A Method of FEA for Reliability Analysis of Solid Propellant Grains

研究了固体推进剂可靠性分析测试中药柱的应力、应变随其内孔直径及内外径比值的变化规律.药柱材料模型基于不可压缩材料的线粘弹性本构关系,建立了药柱的三维有限元计算模型,分析了药柱取不同内孔直径及内外径比值时的动态应力、应变响应.计算结果表明,药柱的应力、应变最大值出现在内孔边缘处,且随内孔直径及外径与内径比值的增大而增大.

Research on the stress and strain of grain was carried out by change of grain＇s inner hole diameter and the ratio of external diameter to inside diameter during the reliability tests of solid propellant grains. The material model of grain was based on incompressible viscoelastic constitutive relationship, and 3D finite element calculation model was established. The dynamic response of the grain＇s stress and strain with different grain＇s inner hole diameter and the ratio of external diameter to inside diameter was analyzed. The calculation results indicate that the stress and strain reached maximum at the brim of inner hole, and the maximum of stress and strain increased as the inner hole diameter and the ratio of external diameter to inside diameter increase.