Effect of strain on ac power loss of Bi-2223/Ag superconducting tapes

Savvides, N.; Herrmann, Jan; Reilly, Donald T.; Müller, K.‐H.; Darmann, F.; McCaughey, G.; Zhao, R.; Apperley, M.

doi:10.1016/s0921-4534(98)00362-1

Cited by 14 publications

(15 citation statements)

References 8 publications

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“…where α, E and V are the coefficient of thermal expansion, Young's modulus and volume fraction, respectively, and E c,I is the Young's modulus of the composite tape, given by equation (1). The measured values of E Bi V Bi , E Ag V Ag , E Alloy V Alloy and E c,I in table 1 can be used directly for calculation of equation ( 4).…”

Section: Equations Used For Calculation Of Thermally Induced Strain A...mentioning

confidence: 99%

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Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor

Ochiai

Rokkaku

Morishita

et al. 2007

Supercond. Sci. Technol.

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A method to estimate the thermally induced residual strain accumulation under varying temperature in a Bi2223/Ag/Ag alloy composite superconductor was presented, in which the mechanical property values measured from the stress-strain curves of the samples with different residual strain states, the residual strain value of Bi2223 filaments in the composite tape at room temperature measured by x-ray diffraction and the reported coefficients of thermal expansion of the constituents (Bi2223, Ag and Ag alloy) in the relevant temperature range were incorporated. This method was applied to estimate the change of the residual strain of all constituents of the high critical current type composite tape fabricated by American Superconductor Corporation as a function of temperature. The residual strain value at 77 K estimated by this method and the reported fracture strain of Bi2223 filaments accounted well for the measured strain tolerance of the critical current at 77 K.

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Section: Equations Used For Calculation Of Thermally Induced Strain A...mentioning

confidence: 99%

“…Bi2223 superconducting composite tapes are subjected to mechanical and electromagnetic stresses during fabrication/winding and operation [1][2][3]. Under the applied strain, the critical current is reduced with increasing applied strain beyond the irreversible strain due to the damage evolution .…”

Section: Introductionmentioning

confidence: 99%

Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor

Ochiai

Rokkaku

Morishita

et al. 2007

Supercond. Sci. Technol.

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“…Mawatari et al [12][13][14][15] theoretically analyzed the AC loss of a polygonal arrangement of superconducting cables and the AC loss of a circular arrangement of cylindrical superconducting cables. Savvides et al [16] measured the AC loss of monofilament and multifilament Bi-2223/Ag strips under transmitted alternating currents by experimental means. Subsequently, Zhang et al [17] experimentally measured the transmission AC loss of Bi-2223/Ag stainless steel strips at different tensile strains and gave a formula for the transmission loss considering the strain factor based on the Norris equation.…”

Section: Introductionmentioning

confidence: 99%

AC Loss and Magnetostriction of Anisotropic High-Temperature Superconductors Under Electro-Magnetic-Thermal Coupling Effect

Zhou

Liang

Shi

2021

J Supercond Nov Magn

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High-temperature superconductors are anisotropic materials and are often subjected to variable external magnetic and temperature fields. The non-uniformity of excitation environment and material will lead to the increase of AC loss and change of magnetostriction effect of superconducting material, which will result in unstable operation and even fracture damage of the equipment. In this paper, cylindrical high-temperature superconductors with material anisotropy are placed in a periodic alternating magnetic field. By controlling the amplitude of external magnetic field, excitation frequency, and non-uniform coefficient of material elastic modulus and ambient temperature, the distribution of electromagnetic field, temperature field, and magnetization intensity during the magnetization of superconductors has been investigated in depth. The AC loss and magnetostriction with the external field loading and unloading process are also discussed in detail based on the electro-magnetic-thermal coupling effect. The results demonstrate that variations in the amplitude and excitation frequency of the external magnetic field will have a remarkable effect on the trapped field, AC loss, and magnetostriction of the superconductor. The change in the non-uniformity coefficient of the material's elastic modulus only has a greater effect on magnetostriction, but has no significant changes on the trapped field, magnetic moment distribution, and AC loss.

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“…The main reasons for the degradation of the critical current densities (J c ) in these materials are the destruction of weak links between grains, formation of microcracks within grains and filaments, delaminating of the silver-HTS interfaces etc [4][5][6][7][8][9][10]. All these, in turn, strongly influence AC transport current loss characteristics [11,12].…”

Section: Introductionmentioning

confidence: 99%

The influence of bending strains on AC power losses in multifilamentary BSCCO-2223/Ag tapes

Tsukamoto¹,

Ciszek²,

Suzuki³

et al. 2006

Supercond. Sci. Technol.

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Recent advances in the manufacturing of multifilamentary high temperature superconducting composite wires allow for wider practical applications of the conductors, e.g. in power transmission cables, transformers and motors. The wires, based mainly on BSCCO-2223 and YBCO-123 cuprates, are used in the forms of variously shaped coils; therefore they are subjected to different kinds of mechanical stresses and strains. These, in turn, lead to some changes in the physical parameters of the superconducting material, mainly in the critical current density, and thus in the dissipated electromagnetic energy, when subjected to changing magnetic fields and transport currents. In this work we report some experimental results related to the AC loss characteristics of Bi-2223/Ag multifilamentary tapes and their dependences on bending strains. These losses are compared to the losses of virgin, straight tapes. The total AC losses, i.e. transport current and magnetization losses, in the Bi-2223/Ag tapes, were measured by means of the electrical and calorimetric methods. The experimental data obtained are compared with the critical state model predictions for AC loss behaviour in the experimental conditions presented here.

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Effect of strain on ac power loss of Bi-2223/Ag superconducting tapes

Cited by 14 publications

References 8 publications

Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor

Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor

AC Loss and Magnetostriction of Anisotropic High-Temperature Superconductors Under Electro-Magnetic-Thermal Coupling Effect

The influence of bending strains on AC power losses in multifilamentary BSCCO-2223/Ag tapes

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