Simulation of a rigid plate hit by a cylindrical hemi-spherical tip-ended soft impactor
Simulation of a rigid plate hit by a cylindrical hemi-spherical tip-ended soft impactor
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DOI：
10.1016/j.commatsci.2006.08.008
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发表时间：
2006-12
影响因子：
3.6
通讯作者：
S. Jenq;F. Hsiao;Ing-Chao Lin;D. Zimcik;M. N. Ensan
中科院分区：
文献类型：
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作者：
S. Jenq;F. Hsiao;Ing-Chao Lin;D. Zimcik;M. N. Ensan
研究了柔性模型鸟弹撞击刚性平板的动态冲击响应。采用半球形圆柱形末端软材料模拟了鸟在116、197和253 m/s入射速度下的运动。研究了柔性冲击器的本构模型。撞击器的直径和长度分别为11.4和22.8 cm，撞击器的重量为1.8 kg（即4 lb）。基于J.S. Wilbeck的AFML-TR-77-134报告中，将软冲击器的材料特性建模为与真实的鸟的特性相似，忽略了鸟的剪切强度。采用非线性有限元程序LS-DYNA对该问题进行了数值分析。在数值分析中采用了拉格朗日（LAG）、欧拉（EUL）和任意拉格朗日欧拉（ALE）三种不同的方法。基于三种方法计算了冲击面中心的模拟动压。将模拟的动压-时间关系与Wilbeck的试验结果进行了比较，并与本研究的稳定滞止压力进行了比较。利用耦合场ALE方法得到了冲击启动后的动压演化和稳态滞止压力，得到了较好的结果。据报告，基于LAG和EUL方法的结果准确度较低。
This work is concerned with the dynamic impact response simulations of a soft model bird projectile striking a flat rigid panel. A hemi-spherical cylindrical tip-ended soft material was adopted to model a bird traveling with an incident velocity of 116, 197 and 253m/s. The constitutive modeling of the soft impactor was studied. The diameter and the length of the impactor were 11.4 and 22.8cm, respectively, and the weight of the impactor was 1.8kg (i.e. 4lb). Based on J. S. Wilbeck’s AFML-TR-77-134’s report, the material properties of the soft impactor was modeled to be similar to the properties of a real bird and the shear strength of the bird was neglected. The non-linear finite element code – LS-DYNA was used in this study to analyze the problem numerically. Three different formulation approaches, i.e. the Lagrangian (LAG), Eulerian (EUL) and the Arbitrary Lagrangian Eulerian (ALE) methods, were adopted in the present numerical analysis. Simulated dynamic pressure at the center of impact surface was computed based on three methods proposed. Simulated dynamic pressure versus time relationships were compared with Wilbeck’s test result and also checked against the stable stagnation pressure for the present study. Good results were found with the use of the coupled-field ALE method to obtain the dynamic pressure evolution after impact initiated and also the stable stagnation pressure. The results based on the LAG and EUL methods were reported to be less accurate.