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Volume 36 Issue 3
May. 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(3): 034201.
WANG Haoyang, WEI Ying, QIAO Li. Simulation of Dynamic Crack Propagation in Superconducting Nb3Sn at Extreme Low Temperature[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 034201. doi: 10.11858/gywlxb.20210884
Citation: WANG Haoyang, WEI Ying, QIAO Li. Simulation of Dynamic Crack Propagation in Superconducting Nb3Sn at Extreme Low Temperature[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 034201. doi: 10.11858/gywlxb.20210884
shu

Simulation of Dynamic Crack Propagation in Superconducting Nb3Sn at Extreme Low Temperature

doi: 10.11858/gywlxb.20210884

  • Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

  • Received Date: 28 Sep 2021
  • Rev Recd Date: 02 Dec 2021
  • Issue Publish Date: 30 May 2022
    Abstract
  • The study on damage and fracture in superconducting Nb3Sn is an indispensible part of understanding the origin of strain sensitivity in Nb3Sn. In this paper, by using molecular dynamic simulations, the fracture and crack propagation behavior of single crystal Nb3Sn with ideal lattice and with central crack at extreme low temperature are studied, respectively. The strain rate effects on the crack initiation and growth in both Nb3Sn sample cases are also carefully analyzed. The results show that for stressed Nb3Sn single crystal with ideal lattice, it slips with the dislocations plugging emerging on the slip band, which contributes to stress concentration and atomic bond breaking, resulting in the failure of Nb3Sn. While for Nb3Sn single crystal with central crack, the atomic bonds break due to the stress concentration concurring at the crack tip, microcracks form and propagate to induce the Nb3Sn fracture. The analysis on the damage fracture and failure mechanism of single crystal Nb3Sn at different strain rates reveals that it shows brittle fracture at low strain rate and ductile fracture at high strain rate.

     

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