爆炸冲击下煤矿救生舱抗爆能力有限元分析

FEM Analysis of Anti-deformation Capability for Coal Mine Refuge Chamber Suffered to Gas Explosion

目前对救生舱的结构安全性能爆炸测试还较困难,借助有限元分析方法可以降低爆炸冲击实验成本并达到结构安全性分析的目的.基于弹塑性有限元理论和LS-DYNA软件对不同爆炸冲击条件下某型号救生舱结构的变形和应力分布进行了有限元分析.分析结果表明:相同冲击载荷条件下侧面比正面受的变形和应力大;加强筋和外层钢板的等效应力较大,容易产生失效.当冲击载荷为1.5 MPa时,舱体整体基本处于弹性变形状态;当冲击载荷为2.0 MPa时,侧面的最大等效应力约为283 MPa,此时加强筋将发生微小的塑性变形,但等效应力远小于抗拉强度.

It is difficult to carry out the experiments of explosion and safety for refuge chambers because of the danger and nonrepeatability of the explosion.The structure deformation and distribution of equivalent stress were investigated under different explosion pressure conditions based on the FEM and software LS-DYNA.The results showed that the distribution of deformation and equivalent stress has the same trend on the same surface with the increment of explosion pressure.The deformation and stress on the sides are more serous and larger compared with that of front of the chamber with the same explosion pressure.The stiffener and outer steel are easy to become invalidation because of the maximum equivalent stress.Furthermore,the deformation of the whole chamber is elasticity with impact pressure 1.5 MPa.When the impact pressure is 2.0 MPa,the deformation of the front still belongs to elasticity but the less plasticity occurs on the stiffener.However,it is safety for the chamber structure because the equivalent stress 283MPa is much less than the tensile strength.