Superconductors under dynamic mechanical stress

Schmidt, C.; Pásztor, G.

doi:10.1109/tmag.1977.1059378

Cited by 34 publications

(14 citation statements)

References 5 publications

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“…As has been shown experimentally by Anashkin et aZ(1975), Schmidt (1976) and Schmidt and Pasztor (1977), the training phenomenon is strongly connected with the mechanical properties of the superconducting materials.…”

Section: Introductionmentioning

confidence: 62%

On the theory of the training phenomenon in superconductors

Maksimov¹,

Mint︠s︡²

1981

J. Phys. D: Appl. Phys.

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Abstract. The critical state stability is investigated taking into account the plastic yield of hard and composite superconductors. The conditions have been found at which the magnetic flux jumps occur, codeveloping with the plastic deformation jerks. It is shown that the interaction of mechanical and thermomagnetic instabilities can reduce appreciably the critical state stability threshold. The effect of the transport current on stability is investigated. The conditions of weak external cooling (in particular, the adiabatic case) are considered in this work. A possible explanation of the training phenomenon is suggested.

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Section: Introductionmentioning

confidence: 62%

On the theory of the training phenomenon in superconductors

Maksimov¹,

Mint︠s︡²

1981

J. Phys. D: Appl. Phys.

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“…tions that training was discovered (Anashkin et al , 1975;Schmidt, 1978;Schmidt and Pasztor, 1977). Further studies confirmed the relationship between training and plastic yield of the material, in particular, plastic strain jerks (Pasztor and Schmidt, 1978;Anushkin et al , 1977Anushkin et al , , 1979.…”

Section: A Derivation Of Basic Equationsmentioning

confidence: 86%

“…Training occurs both in coils and in short samples of superconductors in the presence of stresses which cause plastic deformation of the material (Anashkin et al , 1975(Anashkin et al , , 1979Schmidt, 1976;Schmidt, 1978, 1979). From qualitative considerations, we shall discuss here the critical state stability in short s upe reonduc ting sample s in the presence of plastic yield of the material.…”

Section: E Flux Jumps and Training Of Superconductorsmentioning

confidence: 99%

Critical state stability in type-II superconductors and superconducting-normal-metal composites

1981

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“…However, no research on AE monitoring of ac magnets has been carried out so far. Some causes of the AE induced from dc superconducting magnets have been considered to be flux motion [7], [9], strain effect [8], and wire motion [10]. In the case of ac, additional factors may give influence on the AE signals.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission occurrence induced from a NbTi superconducting coil under alternating current operation

Arai¹,

Yamaguchi²,

Kaiho³

et al. 1999

IEEE Trans. Appl. Supercond.

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Acoustic emission (AE) induced from an alternating current (ac) superconducting coil was studied during operation in liquid helium. The operating current of the coil was increased from zero with a constant ramp rate at a commercial frequency of 50 Hz until quenching in the coil. The AE signals induced from the coil around the time of the quenching initiation were compared with the operating current, the coil voltage, and the phase difference between the current and the voltage in order to estimate the changes in those signals which resulted from the quenching process. The AE signals continued almost at very low levels before the quenching. At the moment of the quenching initiation, the AE signals clearly and drastically rose approximately 10-15 ms earlier than the decrease in the operating current or the phase difference. The AE signals induced by the wire motion during 50-Hz ac operation were also compared with the operating current.

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Superconductors under dynamic mechanical stress

Cited by 34 publications

References 5 publications

On the theory of the training phenomenon in superconductors

On the theory of the training phenomenon in superconductors

Critical state stability in type-II superconductors and superconducting-normal-metal composites

Acoustic emission occurrence induced from a NbTi superconducting coil under alternating current operation

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