基于大应变黏弹性理论的药柱结构可靠性分析

Structural Reliability of Solid Propellant Grain Based on Large Strain Viscoelastic Theory

基于大应变黏弹性理论,用积分随机有限元方法计算结构功能函数的各阶中心矩,用Gram-Charlier级数拟合概率密度函数,再由数值积分得到药柱结构的可靠度。算例表明:基于大应变黏弹性理论的计算结果与实际情况吻合。

Integral stochastic finite element method was applied to gain the every order moment of the structural function based on large stain viscoelastic theory in this paper.The probability density function was fitted through Gram-Charlier series.The numerical integrate was applied to obtain the structural reliability of solid propellant grain.The numerical computation results showed that the calculated result based on large stain viscoelastic theory was in accord with the fact.