点火载荷下翼柱型装药结构完整性数值分析

Numerical analysis on structural integrity of finocyl grain under ignition loading

针对固体火箭发动机翼柱型装药在点火载荷下结构完整性问题,提出了一种考虑三维损伤黏弹性本构性的数值模拟方法。基于商业有限元软件的二次开发平台,编写用户子程序,展开有限元数值计算,获取翼柱型装药在固化降温、点火载荷下装药结构的应力、应变与位移场分布。结果表明,在温度载荷与点火载荷下,药柱内表面变形模式是不同的。然而,不管在温度载荷或点火载荷下,在翼槽处装药Von Mise应力与Von Mises应变高于其他部位。此方法可应用于固体火箭发动机装药结构完整性安全评估。

In order to study the structural integrity analysis of finocyl grain for solid rocket motor under the ignition loading,a numerical simulation method with considering the three-dimensional damage viscoelastic constitutive was proposed.The commercial finite element software was taken to the secondary development,and the user subroutine was written.Therefore,the numerical simulation was carried out.The distribution of stress,strain and displacement filed of finocyl grain were obtained under the condition of the temperature loading and ignition pressure.Results show that the deformation mode of inner surface of grain is different under the temperature loading and ignition loading.However,regardless of the temperature loading or ignition loading,both the Von Mises stress and Von Mises strain in the fin-slot region of grain are higher than those in other parts.This method can be applied to the security assessment of structural integrity analysis of solid rocket motor.