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Abstract

The effects of axial tensile and bending strains on the critical current densities of Ag and AgNiMg/Bi-2212 wires produced by the powder-in-tube method have been studied. The observed degradation of the critical current density due to strain effects is irreversible and can be attributed to the formation of microcracks within the superconducting core. In the case of Ag/Bi-2212 wires the axial tensile strain values leading to a 20% reduction of the critical current density at 4.2 K and 12 T are around 0.2% for both single and multicore wires with seven filaments, whereas the values for AgNiMg/Bi-2212 single and multicore wires exceed 0.5% and 0.8%, respectively. The bending strain experiments reveal a reduced sensitivity to strain effects for Ag/Bi-2212 wires with a larger fraction of Ag in the conductor cross-section. Bending at elevated temperatures has been found to affect the critical current density of Ag/Bi-2212 monocore wires at lower strain levels than axial tensile strains applied at 4.2 K. Results of mechanical properties of the composite wires at 4.2 K are presented.

Additional information

Authors: WESCHE R, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH);FUCHS A M, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH);JAKOB B, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH);PASZTOR G, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Cryogenics, Vol. 36 (1996) No. 6, pp. 419-426
Record Number: 199810719 / Last updated on: 1998-06-08
Category: PUBLICATION
Original language: en
Available languages: en