柱状装药爆炸条件下厚壁圆筒爆室内 流场及结构动力响应分析

借助非线性动力有限元程序ANSYS/LS-DYNA,采用基于罚函数的流固耦合算法,对厚壁圆筒爆 室在柱状装药爆炸作用下的动态响应过程进行了数值模拟研究。分析了厚壁圆筒爆室内柱状装药爆炸非定 常流场的演化过程以及筒体的动力响应特征。给出了爆炸流场的压力云图、筒壁受到的爆炸压力峰值及冲量 的分布规律、筒体的等效应力云图以及等效应力的分布规律等。流场压力及筒体应变的计算结果与实测结果 吻合较好,并将动力响应的有限元计算结果与理论解进行了比较,证明轴对称平面应变假设下的理论解可以 给出问题的保守估算。分析表明,该厚壁圆筒爆室在柱状装药爆炸作用下在弹性范围内工作,爆室的强度设 计是安全的。

Internal blast flow field and dynamic responses of thick-walled cylinder subjected to cylindrical charge explosion

With fluid-solid coupling algorithm based on the penalty function of non-linear dynamic finite element program ANSYS/LS-DYNA,the dynamic response process of the thick-walled cylinder subjected to internal cylindrical charge explosion was numerically simulated.The evolution of the unsteady blast flow field in the cylinder and the dynamic response of the cylinder were analyzed.Pressure contour of blast flow field,the distribution of blast pressure and impulse on inner wall of the cylinder,von-Mises stress contour,the distribution of von-Mises stress were given.Simulation results of blast pressure and hoop strain were in good agreement with experimental results,and calculation results of dynamic response were compared with the theoretical solution.It was proved that the theoretical solution based on plane-strain assumption may give a conservative estimate for this problem.The results show that the thick-walled cylinder subjected to internal cylindrical charge explosion was in elastic state,and the design of the blast chamber is safe in carrying capacity.The analyses are helpful to similar design and safe use of blast chambers.