钢管在冲击荷载作用下的变形与失效破坏

Deformation and Failure of the Steel Pipe under Impact Load

为研究钢管在弹体侵彻过程中的变形特点,基于ANSYS/LS-DYNA软件,采用Johnson-Cook模型,模拟了半球形弹体以不同速度正向冲击钢管时的非线性动力响应情况。结果表明:弹体速度越小,钢管的抗侵彻性能越好;弹体速度越接近临界破坏速度,钢管降低弹体速度的能力就越明显;弹体冲击钢管时,钢管上表面比下表面更容易产生大变形,消耗更多的弹体动能,并在抗侵彻过程中伴有局部凹陷、蝶形变形和贯穿现象。实验结果可为圆柱壳结构钢管在冲击荷载作用下的耗能分析提供参考。

In order to study the deformation of the steel pile under projective penetration, the nonlinear dynamic response process of the hemispherical projectile with different speed shocking into the steel pipe was numerically simulated based on the software ANSYS/LS.DYNA and Johnson.Cook model. The results demonstrate that the lower the projectile velocity is,the better the pipe steel anti.penetration performance is; when the speed is closer to the critical speed, the ability to reduce the projectile velocity is more obvious; the upper surface of the steel pipe is more prone to large deformation and consumption of kinetic energy projectile than the lower surface associated with the local dent, dish-shaped deformation and penetration phenomenon in the process of antipenetration to prevent the bullet further penetration. The research results can be applied to analysis energy dissipation of the cylindrical hell structure under penetration load.