An Extension of the Wen-Jones Model for Thin Metal Plates Struck Transversely by Flat-Ended Projectiles
doi: 10.11858/gywlxb.2014.04.014
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摘要: 针对平头弹丸穿透固支圆形金属薄靶问题, 对Wen-Jones模型进行了推广应用。根据前人的研究成果, 提出了等效应变失效准则, 以预测金属薄靶的穿透。与实验数据的对比表明, 新模型的预测结果与有关低碳钢和铝合金的实验结果相吻合。尽管新模型与Wen-Jones模型采用的破坏准则不同, 但是两者的预测结果相近。分析发现, 当靶板材料的延性足够大时, Wen-Jones模型可看作是新模型的一种特殊情况。Abstract: An extension of the Wen-Jones model for the perforation of fully-clamped circular thin metal plates struck transversely by flat-faced projectiles at the center was made.Based on previous studies, an effective strain failure criterion was suggested to predict the perforation of the thin metal plates.It is shown that the present model predictions are in good agreement with available experimental data for mild steel plates as well as aluminum alloy targets.The present model and the Wen-Jones model produced similar results although they are constructed using different failure criteria, which indicates that the Wen-Jones model can be seen as a special case of the present model when the ductility of plate is large enough.
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Figure 1. Fully clamped circular thin metal plate loaded statically by a flat-faced circular punch and struck by a projectile with mass mp and initial velocity vp
Figure 3. Comparison between the theoretical predictions and the experimental data for fully-clamped circular mild steel plates[1]
Figure 4. Comparison between the theoretical predictions and the test data for St52-3N square mild steel plates[17]
Figure 5. Comparison between the theoretical predictions and the experimental data for clamped circular aluminum alloy plates[1]
Figure 6. Comparison between the model predictions and the experimental data for fully-clamped circular BSL157-T6 aluminum alloy plates[6]
Table 1. Values of parameters for the mild steel plates[1]
Projectile Plates mp/(g) d/(mm) H/(mm) σy/(MPa) σu/(MPa) ef R/(mm) n D/(s-1) q 34.6 12.5 1.3 220 315 1.05 120 0.25 40.4 5 1.9 300 360 2.7 270 350 3.0 270 350 5.0 220 335 6.4 362 500 
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Table 2. Values of parameters for the St52-3N mild steel plates[17]
Projectile Plates mp/(kg) d/(mm) H/(mm) σy/(MPa) σu/(MPa) ef R/(mm) n D/(s-1) q 49.54 36.5 4 393 502 1.05 258 0.25 40.4 5 6 371 495 8 394 532 10 358 496
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