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Analysis Model on Penetration Depth of Concrete by Eroding long-rod projectiles

Journal of Beijing Institute of Technology 2010年第4期19卷 395-398页

作者：练兵蒋建伟门建兵王树有 State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Military Representative Office of Air Force in Xiangfan Area Xiangfan

Mass loss should be considered while calculating the penetration depth of concrete by eroding long-rod projectiles of high *** penetration process is divided into two phases：eroding phase and rigid *** eroding phase,a model to predict the penetration depth is established on the assumption that there is a chipping region in the bottom of *** rigid phase,Forrestal formula is adopted to calculate the penetration *** this model,the depth of concrete penetration by a tungsten alloy long-rod projectile is *** the critical eroding velocity is between 950 m/s and 1 000 m/s,the result is in good agreement with the experimental data.

关键词： eroding long-rod projectile penetration concrete

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Theoretical analysis for self-sharpening penetration of tungsten high-entropy alloy into steel target with elevated impact velocities

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Acta Mechanica Sinica 2021年第6期37卷 970-982,I0002页

作者： Haihua Chen Xianfeng Zhang Chuang Liu Wei Xiong Mengting Tan Lan-Hong Dai School of Mechanical Engineering Nanjing University of Science&TechnologyXiaolingwei 200Nanjing210094China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing101408China

The“self-sharpening”effect has been observed experimentally in the penetration of tungsten high-entropy alloy(WHEA)into steel targets in previous *** the microscopic observation of the residual WHEA long-rod projectile(LRP),the multiphase structure at micro-scale of WHEA is the key effects on self-sharpening penetration *** order to describe the distinctive penetration behavior,the interaction between micro phases is introduced to modify the hydrodynamic penetration *** yield strengths of WHEA phases are determined based on the solid solution strengthening *** with the elbow-streamline model,the self-sharpening mechanism is revealed in view of the multi-phase flow dynamics and the flow field in the deformation area of the LRP nose is characterized to depict the shear layer evolution and the shape of the LRP’s nose as well as the determination of the penetration *** self-sharpening coefficient considering the reduction of nose radius is proposed and introduced into the penetration model to calculate the depth of penetration and the penetration *** show that the multi-phase interaction at the microscopic level contributes to the inhomogeneous distribution of the WHEA *** shear layer evolution separates part of the LRP material from the nose and makes the nose radius decrease more *** is also the reason that WHEA LRPs have a pointed nose compared with the mushroom nose of WHA heavy alloy(WHA)*** calculated results agree well with the corresponding experimental data of WHA and WHEA LRPs penetrating into semi-infinite medium carbon steel targets with elevated impact velocities.

关键词： Impact dynamics long-rod projectile Tungsten high-entropy alloy(WHEA) Self-sharpening penetration Solid solution strengthening

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