平头弹低速冲击下薄钢板的穿甲破坏机理研究

为研究平头弹低速冲击下薄钢板的穿甲破坏机理，开展了一系列弹道试验。对比分析了不同初始速度下的弹体变形以及靶板破坏模式。采用非线性有限元分析ANSYS/LS-DYNA软件，对弹靶作用过程进行了数值模拟。根据试验结果确定了碟形区最终变形挠度的拟合函数，在此基础上对弹体和靶板的塑性变形能进行了理论分析，同时利用能量守恒原理建立了平头弹低速侵彻薄钢板的剩余速度计算模型。结果表明：平头弹低速侵彻下会发生一定程度的墩粗变形；平头弹低速侵彻下靶材主要为拉伸与剪切混合失效，靶板相应的失效模式为带有碟形变形的拉伸与剪切混合失效模式；弹体剩余速度的理论模型与试验结果吻合较好，有效地验证了该理论模型的适用性。

Investigation on the Damage Mechanism of Blunt Projectile against Thin Plate

The ballistic tests were carried out to explore the failure modes of target impacted by the blunt projectile.The deformation of of projectiles and the damage modes of targets at different initial velocities were analyzed.The interaction between projectile and target is simulated using ANSYS/LS-DYNA for analyses of penetration mechanism.The fitting curve of final target deformation in the dishing area was acquired according to the test results.The plastic deformation energies of projectile and target are analyzed,and a simplified analytical model for residual velocity is proposed based on principle of conservation of energy.It is shown that mushrooming deformation is observed in the projectile.The target material fails due to sheering and stretching,and accordingly the failure modes of targets are global dishing deformation with local sheering and tensile failures.The residual velocity drawn from the formula proposed in this paper is in good agreement with the test data,which testifies the applicability of the proposed model.