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Tensile properties and critical current strain limits of reinforced Bi-2212 conductors for high field magnets.

M BrownE BosqueD McRaeR P WalshJ JiangE E HellstromY KimU TrociewitzA OttoD C Larbalestier
Published in: IOP conference series. Materials science and engineering (2017)
We study here the effect of axial strain on the degradation of the critical current Ic for bare and reinforced, overpressure processed Bi-2212 conductors. We show that reinforcement markedly improves the conductor's stress limit, doubling it from ~150 MPa in the bare conductor to ~300 MPa when reinforced. We find also that certain processes used to reinforce the conductor slightly reduce the Ic degradation strain limit from ~0.6% to ~0.4%. Stress vs strain data taken from the samples studied here has been used to create a finite element model to explore the feasibility of using a reinforced Bi-2212 strand (produced by Solid Material Solutions) in a small test coil. The model predicts an IC limited coil with a maximum hoop strain of 0.31%, well below the experimentally verified strain limit, and is designed to lead to Bi-2212 coils that are not strain limited, but Ic limited.
Keyphrases
  • stress induced
  • big data
  • artificial intelligence