一种自由装填式组合药柱的低温三维结构完整性分析

为分析自由装填式复杂组合药柱在低温多次出现点火爆炸的原因,采用基于Updated Lagrangian方法的三维热粘弹性大变形增量本构关系,对组合药柱的结构完整性进行了计算。为分析瞬态温度场以及热应力应变分布,采用基于时温等效原理和热流变简单材料假设的有限元模型,得到了危险点位置,并比较了在不同贮存温度下组合药柱的结构完整性。结果表明,药柱结构的不合理性是导致低温贮存条件下组合药柱发生结构完整性破坏的主要原因。

Analysis on three-dimensional structural integrity of a free loading mixed grain under low temperature environment

In order to analyze the reason why firing failure of the free loading mixed grain under low temperature environment occurs usually,structural integrity of mixed grain was calculated by using 3D thermoviscoelastic large deformation increment constitutive equation based on Updated Lagrangian method.At the same time,in order to analyze transient temperature field and thermal stress and strain distribution,a step-by-step finite element model based on time-temperature equivalent principle and thermorheologic simple material assumption was used to obtain dangerous location,and structural integrity of mixed grain under different storage temperatures was compared.The results show that structural irrationality of mixed grain is the main reason for structural integrity failure under low temperature environment.