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China hydrodynamic penetration

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Approximate solutions of the Alekseevskii–Tate model of long-rod penetration

China hydrodynamic penetration
China hydrodynamic penetration
China hydrodynamic penetration
China hydrodynamic penetration
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(PDF) Long-rod penetration: the transition zone between rigid and hydrodynamic penetration modes

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Long-rod penetration: the transition zone between rigid and hydrodynamic penetration modes

Science China Technological Sciences. The modified hydrodynamic theory of long rod penetration into semi-infinite targets was established independently by Alekseevskii and Tate over forty years ago and since then many investigators contributed much to the development of the high speed penetration mechanics. However, in all the models proposed so far, the target resistance R t is not well defined and usually determined by adjusting it until the predicted depth of penetration comes to an agreement with experimental data. In this paper, assumptions are first made about particle velocity and pressure profiles together with response regions in the target and then an extension is made to the modified hydrodynamic theory of long rod penetration into semi-infinite targets, in which R t has explicit form and is dependent on penetration velocity as well as thermo-mechanical properties of target material.
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Acta Mechanica Sinica. If the impact velocity of the penetrator is higher than the hydrodynamic velocity V H , it will penetrate the target in an erosive mode; if the impact velocity lies between the hydrodynamic velocity V H and the rigid body velocity V R , it will penetrate the target in a deformable mode; if the impact velocity is less than the rigid body velocity V R , it will penetrate the target in a rigid mode. The critical conditions for the transition among these three penetration modes are proposed. It is demonstrated that the present model predictions correlate well with the experimental observations in terms of depth of penetration DOP and the critical transition conditions.
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