摘要
针对内爆炸载荷的特点,采用等效单自由度法与薄膜理论分别得出了等效静载动效系数的解析式与径向位移的动态表达式。将反射压力代入径向位移与动效系数表达式中,得到最大径向位移与等效静载的解析式。所得解析式计算值与实验和数值模拟结果符合较好。运用三维有限元编码与现场实测的方法对爆室内冲击波流场的演化及壳体动力响应规律进行了研究。结果表明:①内爆炸加载容器的动力响应主要取决于首次压力脉冲。②壳体的最大应变由近爆点向远爆点方向逐渐降低。研究结果为相似工程设计提供了参考。
According to the characteristics of an internal explosion load,analytic solutions of the dynamic effect coefficient were derived by using the equivalent single degree of freedom method and dynamic expressions of radial dispersion were gained by the boundary-layer theory.The maximum radial dispersion and the dynamic effect coefficient were calculated by substituting the reflected shock pressure into expressions of radial dispersion and dynamic effect coefficient.The results showed that analytic solutions were in good agreement with experimental and numerical simulation results.The laws of shock wave propagation in a blast chamber were investigated by using three-dimensional finite element codes and experiment methods.The results showed that 1.the dynamic response of a shell as a blast chamber was determined by the first pressure impulse;2.the maximum strains of the shell decreased away from the explosion center.The analyses provided references for similar engineering designs.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第10期106-111,共6页
Journal of Vibration and Shock
基金
国家自然科学基金重点项目(10632080)
国家自然科学基金项目(10402041
10572134)
关键词
爆炸力学
动力响应
动效系数
数值模拟
mechanics of explosion
dynamic response
dynamic effect coefficient
numerical simulation
