Resistant performance of perforation of multi-layered targets using an estimation procedure with marine application |
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Authors: | Cho-Chung Liang Ming-Fang Yang Pin-Wen Wu Tso-Liang Teng |
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Institution: | aDepartment of Mechanical Engineering, Da-Yeh University, 112 Shan-Jiau Rd., Dah-Tsuen, Chang-Hua, Taiwan 515, ROC;bInstitute of Resource and Environment, Leader University, No. 188 Sec. 5 An-chung Rd., Tainan City, Taiwan, ROC;cChung-Shan Institute of Science & Technology, Procurement & Construction Service Division, Lung-Tan,Ta-Shi, Tao-Yuan 335, Taiwan, ROC |
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Abstract: | Recently, multi-layered targets have become commonplace in both military and civilian applications, such as marine hulls, armored vehicle bodies, outside structures of bulletproof cars, and aerospace vessels. This paper studies the resistant performance of perforation in multi-layered targets. An estimation procedure is established based on the concepts of the conservation of momentum, impulse-momentum law, and conservation of energy. Experimental results of the test of Almohandes et al. are adopted to check the residual velocity of multi-layered targets. The results of the verification are good in terms of agreement for impact velocities ranging from 700 to 800 m/s, when the ratio of the projectile length to the projectile diameter (i.e. L/D) is 4.2, and the average residual velocity error of single, double- or triple-layered targets range approximately from 4.42 to 8.40%. The ballistic performance is best for the double target when the ratio of the first layer thickness to the total thickness (i.e. t1/(t1+t2)) is about 0.75, and the worse performance occurs when the ratio t1/(t1+t2) is 0.5. An air gap slightly influences the resistant performance of perforation in multi-layered targets. These results may serve as a useful reference for designers. |
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Keywords: | Projectile Impact Penetration Perforation Multi-layered targets |
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