【摘 要】
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A study on the resistance of rigid projectiles penetrating into semi-infinite concrete targets is performed in this paper.Experi-mental data are analyzed to examine the penetration resistance during various stages of the penetration process.A numerical to
【机 构】
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College of Management Science and Engineering,Shanxi University of Finance and Economics,Taiyuan 030
论文部分内容阅读
A study on the resistance of rigid projectiles penetrating into semi-infinite concrete targets is performed in this paper.Experi-mental data are analyzed to examine the penetration resistance during various stages of the penetration process.A numerical tool using AUTODYN hydrocode is applied in the study.The numerical results on both deceleration-time history and depth of penetration of projectiles are in good agreement with experimental data,which demonstrate the feasibility of the numerical model in these conditions.Based on the numerical model with a two-staged pre-drilled hole,the rigid projectile penetration in tunneling stage is studied for concrete targets with different strengths in a wide range of impact velocities.The results show that the penetration in tunnel stage can be divided into two different cases in terms of initial impact velocity.In the first case,when the impact velocity is approximately less than 600 m/s,the deceleration depends on initial impact velocity.In the second case,when the impact velocity is greater than 600 m/s,the effect of target inertia becomes apparent,which agrees with commonly used concrete penetration resistance equations based on cavity expansion model.
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