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Stress Effects in Nb3Sn-Nb-Bronze Composites

  • C. A. M. van der Klein
  • J. Prij

Abstract

Since the effect of mechanical loading on the superconducting properties of Nb3Sn will be crucial for the development of large Nb3Sn magnets, much work has been done on this subject [1–4]. Although most results show an initial increase of the critical current upon uniaxial loading before stress-induced degradation, there also have been experiments indicating degradation only [1–4]. The initial increase of the critical current, Ic, upon loading is due to the relief of a compressive stress on the superconducting layer, which is generated upon cooldown by differences of thermal contraction between the components of the conductor. At maximum I c, the applied tensile stress just compensates the compressive stress. So the appearance of a maximum and the strain at the maximum will be determined by the internal stresses between the components. The mechanical properties at 4.2 K and the behavior of I c under applied strain have been investigated for five commercial conductors, all stabilized by additional copper at the outside of the conductor. Since it is generally accepted that the reversible degradation of I c is related to the degradation of the intrinsic parameters, the behavior of the critical temperature, T c upon straining was also studied.

Keywords

Critical Current Critical Current Density Applied Strain Applied Tensile Stress Cryogenic Engineer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    G. Rupp, Cryogenics 18:663 (1978).CrossRefGoogle Scholar
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    J. W. Ekin, in Advances in Cryogenic Engineering, Vol. 24, Plenum Press, New York (1978), p. 306.Google Scholar
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    T. Luhman, M. Suenaga, D. O. Welch, and K. Kaiho, IEEE Trans. Magn. MAG-15(1):699 (1979).CrossRefGoogle Scholar
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    T. Luhman, M. Suenaga, and C. J. Klamut, in Advances in Cryogenic Engineering, Vol. 24, Plenum Press, New York (1978), p. 325.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • C. A. M. van der Klein
    • 1
  • J. Prij
    • 1
  1. 1.Netherlands Energy Research Foundation, ECNPettenThe Netherlands

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