Numerical Simulations of the Perforation of Aluminum Targets Struck by a Deformable Projectile
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摘要: 采用显式动态有限元商业软件ABAQUS/Explicit对可变形卵形弹丸正贯穿和斜贯穿有限厚度铝合金靶的过程进行了有限元数值模拟。根据空穴膨胀理论，将靶体对侵彻的影响用一个作用在弹体表面的力函数代替，同时考虑了有限厚度靶自由表面的影响，并对空穴膨胀得到的力函数进行了修正。这样在进行数值模拟时就无需对靶体划分网格，也避免了复杂的接触问题，从而使模拟大为简化。最后，用VAR4340钢弹贯穿6061-T651铝合金靶板得到的数值模拟结果与实验结果进行了比较，二者基本吻合。Abstract: Numerical simulations are conducted on the perforation of aluminum targets struck by an ogive-nosed steel projectile using the commercial FEM code ABUQUS/Explicit. It is assumed that the target response can be represented by a velocity dependent forcing function which is derived from spherical cavity expansion (SCE) analysis. Free surface effects are also considered and a modified forcing function is used in numerical simulations. This approximation eliminates the need for discretizing the target as well as the need for a contact algorithm. It is shown that the numerical simulations are in good agreement with the experimental data for 6061-T651 aluminum alloy targets struck by a VAR 4340 steel projectile.
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