A simplified temporary cavity model for spherical fragments penetrating gelatin

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (17) : 41-46.

TIAN Haocheng, LU Fangyun, LI Zhibin, WANG Shuo

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Abstract

Here, the temporary cavity phenomenon formed by fragments penetrating gelatin was studied.Based on the software LS-DYNA, a 2-D axisymmetric model of spherical fragments penetrating gelatin was established.The correctness of the simulation results was verified with the relevant test results.Furthermore, change laws of velocity attenuation and temporary cavity sizes after fragments with different diameters and different impact velocities penetrating gelatin target with a finite thickness were analyzed and discussed.The genetic algorithm was used to fit simulation data under different working conditions, and a simplified mathematical model to calculate temporary cavity was obtained.The effectiveness of the model was verified by comparing with more simulation results.It was shown that the simplified model can be used to quickly calculate the damage area caused by spherical fragments penetrating biological targets; the simplified model is of practical significance to improve the efficiency of damage assessment and vulnerability analysis of human targets.

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spherical fragment / gelatin / genetic algorithm / temporary cavity / empirical model

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TIAN Haocheng, LU Fangyun, LI Zhibin, WANG Shuo. A simplified temporary cavity model for spherical fragments penetrating gelatin[J]. Journal of Vibration and Shock, 2021, 40(17): 41-46

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