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采用适合于计算与爆炸冲击载荷相关的结构大变形问题的ALE流固耦合算法,给出了数值分析爆源、爆炸流场和结构动力学响应等问题所采用的控制方程。重点研究了爆炸流场,即冲击波的传播和波系的演化过程,对影响数值计算精度和稳定性的关键因素:网格控制、时步控制以及粘性项因素进行了讨论,并采用非线性动力有限元程序LS-DY-NA,对冲击波流场与结构耦合作用的全过程进行了数值分析。成功地模拟了建筑物在内爆荷载作用下的动态破坏过程,并得到了某框架结构的毁伤破坏范围。
The ALE fluid-solid coupling algorithm, which is suitable for calculating the large deformation of structures related to the impact load of explosion, is adopted. The governing equations adopted for the numerical analysis of explosion, explosion flow field and structural dynamic response are given. The explosion flow field, that is, the propagation of shock wave and the evolution of the wave system, is studied. The key factors that affect the accuracy and stability of numerical calculation are discussed, such as grid control, time-step control and viscosity factor. The nonlinear dynamic Finite element program LS-DY-NA, the numerical analysis of the whole process of the shock wave field coupling with the structure was carried out. The dynamic failure process of the building under the implosion load is successfully simulated and the damage damage range of a frame structure is obtained.