基于LSDYNA的半圆柱壳爆炸荷载下的能量反应

Energy response of hemi-cylindrical shells subjected to blast loading based on LSDYNA

半圆柱壳结构在体育馆、大型机场等大场景结构上应用广泛.为了研究半圆柱形钢壳在爆炸荷载作用下的总能量响应,使用有限元软件LS-DYNA建立在爆炸荷载下半圆柱壳的数值计算模型,采用理论分析和数值模拟相结合的方法进行推导验证,并在此基础上研究壳体厚度对结构能量的影响规律.结果表明:爆炸产生的总能量与壳体厚度成反比;与壳半径上的表示坐标之比所对应的反正切函数成正比.为了验证理论推导的正确性,对理论计算结果进行多次数值模拟验证,所得结果基本相符合.其计算模型可用于半圆柱钢壳的爆炸能量分析,对同类型壳体爆炸能量分析具有一定的参考价值.

The semi-circular cylindrical shell structure is widely used in the stadium,large airport and other large scene structures.The finite element software LS-DYNA is used to establish the numerical calculation model of semi-cylindrical shell under explosion load.The total energy response of semi-cylindrical steel shell under explosion load was studied by combining theoretical analysis and numerical simulation.At the same time,the influence of shell thickness on structural energy was also studied and it was proved that the total energy generated by explosion is inversely proportional to shell thickness,and is directly proportional to the arctangent function,which represents the ratio of the coordinates on the shell radius.In order to verify the correctness of the theoretical derivation,several numerical simulations were carried out to verify the theoretical calculation results.The results are basically consistent with each other.The calculation model can be used to analyze the explosion energy of semi cylindrical steel shell,and has a certain reference value for the explosion energy analysis of the same type of shell.