Volume 35 Issue 2
Mar 2021
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WANG Yuntian, ZENG Xiangguo, CHEN Huayan, YANG Xin, WANG Fang, QI Zhongpeng. Numerical Simulation of Spalling Process of Tantalum Target under Impacts[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024203. doi: 10.11858/gywlxb.20200634
Citation: WANG Yuntian, ZENG Xiangguo, CHEN Huayan, YANG Xin, WANG Fang, QI Zhongpeng. Numerical Simulation of Spalling Process of Tantalum Target under Impacts[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024203. doi: 10.11858/gywlxb.20200634

Numerical Simulation of Spalling Process of Tantalum Target under Impacts

doi: 10.11858/gywlxb.20200634
  • Received Date: 06 Nov 2020
  • Rev Recd Date: 02 Dec 2020
  • In this paper, the spallation characteristics of tantalum (Ta) under plate-impact loading are studied through numerical simulation. The feasibility and reliability of the Lagrange and smooth particle hydrodynamics (SPH) methods and several constitutive models (the Johnson-Cook, Steinberg-Cochran-Guinan and Zerilli-Armstrong model) are discussed. Comparison between the simulation results with experimental data, it is found that using the SPH method combined with the Steinberg-Cochran-Guinan constitutive model could produce the best consistency in the strain rate range from 2.31 × 104 s−1 to 5.40 × 104 s−1 for Ta. In addition, by changing the impact velocity and the thickness of the flyer, the free surface velocity curves under different strain rates are obtained, and the spalling characteristics under different strain rates are calculated and discussed. Characteristic parameters of spallation are calculated by using the free surface velocity data. The results have shown that the spalling strength of Ta increases with the strain rate, and is approximately linear in the logarithmic coordinate. Several computation methods of spall strength are considered in this work, and the difference between the results obtained by different methods are within the range of 8%. On the other side of the spectrum, the bounce rate of the free surface velocity increases with increasing strain rate. Finally, the physical meaning of the characteristic parameters in the free surface velocity curve is also discussed.

     

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