In situ synchrotron-radiation measurements of axial strain in laminated Bi2223 superconducting composite tapes at room temperature

Okuda, Hiroshi; Rokkaku, H.; Morishita, Kohei; Shin, J.K.; Iwamoto, Shinichiro; Ochiai, Shojiro; Sato, Masugu; Osamura, Kōzō; Otto, A.; Harley, Edward J.; Malozemoff, A. P.

doi:10.1016/j.scriptamat.2006.06.027

Cited by 12 publications

(9 citation statements)

References 12 publications

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“…Their critical values are summarized in Table IV. It has been made clear that the lamination improves the strain/ stress dependence of critical current as summarized in Table IV. As discussed previously [1], [5], the relation between the force free strain and the reversible strain is given by the equation; (4) which indicates the tensile strain exerted on the SC component. As summarized in Table V, this quantity became about 0.1% for the insert tapes, while it increased almost by 2 times by the lamination.…”

Section: E Reversible Strain Limitmentioning

confidence: 99%

Improvement of Reversible Strain Limit for Critical Current of DI-BSCCO Due to Lamination Technique

Osamura

Machiya

Suzuki³

et al. 2009

IEEE Trans. Appl. Supercond.

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The DI (dynamically innovative)-BSCCO-Bi2223 tapes achieved high critical current as well as high modulus of elasticity. Further the reversible strain limit and the corresponding stress for critical current have been remarkably increased by means of lamination technique. During the course of development, their optimized architecture has been designed based on the principle of the rule of mixture for maximizing the force free strain exerted on the superconducting component. The reversible strain/stress limit ( rev rev ) was defined as a strain, at which the critical current recovers to the level of 99% co . Selecting several kinds of laminating materials and changing condition of the fabrication, the excellent Cu alloy-3ply tape with co of 311 A/cm was realized of which rev and rev reached 0.42% and 300 MPa, respectively. Further during the theoretical analysis, the increase of reversible strain limit were made clear to be attributed to the increase of thermally induced residual strain as well as the compensation effect of laminated layers against a local fracture mode.Index Terms-BSSCO-Bi2223, critical current, force free strain, modulus of elasticity, residual strain.

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Section: E Reversible Strain Limitmentioning

confidence: 99%

Improvement of Reversible Strain Limit for Critical Current of DI-BSCCO Due to Lamination Technique

Osamura

Machiya

Suzuki³

et al. 2009

IEEE Trans. Appl. Supercond.

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“…In order to analyze residual strain/stress, various models have been developed [2][3][4]. Attempts to measure directly the residual strain exerted on the BSCCO component have been carried out by diffraction techniques using synchrotron radiation and neutron beams [5][6][7][8]. Ochiai et al [3] proposed a method to estimate the thermally induced residual strain accumulation under varying temperature in BSCCO composite superconductors.…”

Section: Introductionmentioning

confidence: 99%

“…Ochiai et al [3] proposed a method to estimate the thermally induced residual strain accumulation under varying temperature in BSCCO composite superconductors. Okuda et al [6] reported that the BSCCO filaments in the laminated composites were under 0.11% compressive residual strain for the SUS 3-ply (stainless steel) tape. However, it is still necessary to obtain quantitative knowledge of the strain/stress effect through electromagnetic property measurements in order to further enhance the performance these tapes.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior and strain dependence of the critical current of DI-BSCCO tapes

Osamura

Machiya

Suzuki

et al. 2008

Supercond. Sci. Technol.

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In order to clarify the mechanical properties and their influence on the critical current of DI-BSCCO tapes with and without lamination, mechanical tests and critical current measurements were performed, and the corresponding residual strain exerted on the BSCCO component was measured by a neutron diffraction technique. Also the residual strain analysis was calculated using the rule of mixtures. The measured modulus of elasticity, the second slope, and the stress corresponding to the force free strain were self-consistently explained on the basis of this analytical model. The calculated residual strain in the BSCCO component was found to be nearly identical with that determined by neutron diffraction for all DI-BSCCO tapes except for the case of the low strength insert tape. The difference between the strain corresponding to 95% I c retention and the force free strain was explained by the fracture strain of BSCCO filaments. An approximate expression to evaluate the residual strain in the BSCCO filaments is also presented along with a procedure for estimating the initial temperature T 0 at which the residual strain starts to accumulate during cooling after the fabrication heat treatment.

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“…However, ceramic insulation coatings usually suffer failure cause by flaking and cracking [12] during cooling due to excessive residual stresses generated near the interface and poor bonding strength between MgO-ZrO 2 coating and Stainless Steel (SS) substrate. The critical stresses of the bonded system occur in coatings between substrate and films because of thermal and elastic mismatch effects [13][14][15][16]. These effects are relatively substrate coating thickness, thickness of interlayers and fracture resistance of the interface; the plastic flow stress of the metal etc.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Analysis of Insulation Coatings for Magnet Technologies

Guney¹

2013

Archives of Metallurgy and Materials

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High temperature MgO-ZrO2 insulation coatings were grown on long-length Stainless-Steel (SS) tapes by reel-to-reel sol-gel method for applications of High Temperature Superconductor/Low Temperature Superconductor (HTS/LTS) coils and magnets. The residual stresses were investigated analytically at various temperature ranges, 580°C to 25°C (room temperature) and -196°C (liquid helium temperature), and 630°C to 25°C and -196°C for different thicknesses to be 13, 12, and 7 μm. The maximum stress values were obtained to be 1.92 GPa in tension for SS substrate with the 13 μm coating and -2.42 GPa in compression for the 7 μm MgO-ZrO2 coating in the temperature range between 630°C and liquid helium temperature. The surface morphologies and microstructure of sample were also characterized using a scanning electron microscope (SEM). SEM observations revealed that MgO-ZrO2 coatings have a mosaic like crack structure.

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In situ synchrotron-radiation measurements of axial strain in laminated Bi2223 superconducting composite tapes at room temperature

Cited by 12 publications

References 12 publications

Improvement of Reversible Strain Limit for Critical Current of DI-BSCCO Due to Lamination Technique

Improvement of Reversible Strain Limit for Critical Current of DI-BSCCO Due to Lamination Technique

Mechanical behavior and strain dependence of the critical current of DI-BSCCO tapes

Residual Stress Analysis of Insulation Coatings for Magnet Technologies

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