Understanding Reversible Strain Behavior in Bi-2212 Magnet Design Literature
Literature review on the strain sensitivity of Bi-2212 wires, focusing on reversible transverse pressure strain and its impact on magnet design. Discussions on the correlation between axial and transverse strain behavior, the effects of heat treatments, and variations in strain sensitivity among manufacturers. Reference to relevant studies on critical current variation and electromechanical characterization of Bi-2212 strands.
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Click to edit Master title style Bi Bi- -2212 strain data in literature 2212 strain data in literature June 2, 2020 June 2, 2020 Emanuela Barzi Emanuela Barzi US Magnet Development Program US Magnet Development Program 1
Click to edit Master title style Questions Questions Determine reversible transverse pressure strain for Bi-2212 magnet design. Understand whether it improves when using 50 bar heat treatments. In literature there are many more data on Ic sensitivity of Bi-2212 wires to axial strain (tensile and compressive). Therefore it would be useful to find an appropriate equivalent strain correlation for transverse pressure cases. 2
Click to edit Master title style Bi Bi- -2212 2212 I Ic c Sensitivity on Axial Strain Sensitivity on Axial Strain COMPRESSIVE COMPRESSIVE TENSILE TENSILE All Bi All Bi- -2212 wires are Powder 2212 wires are Powder- -in in- -Tube. However, strain sensitivity appears to depend Tube. However, strain sensitivity appears to depend on the specific manufacturing technology used by each manufacturer. on the specific manufacturing technology used by each manufacturer. 3
Click to edit Master title style Axial vs. Transverse Strain Axial vs. Transverse Strain Using Von Mises strain correlation seems to represent quite well transverse pressure data up Using Von Mises strain correlation seems to represent quite well transverse pressure data up to the knee seen in axial strain data. Then compressive strain behavior guides to the knee seen in axial strain data. Then compressive strain behavior guides I Ic c reduction. reduction. 4
Click to edit Master title style References References [1] M. Sugano, K. Itoh, and T. Kiyoshi, Strain Dependence of Critical Current in Bi2212 W & R Wires Under Magnetic Field Up to 30 T , IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 16, NO. 2, JUNE 2006. [2] X. F. Lu, L. F. Goodrich, D. C. van der Laan, J. D. Splett, N. Cheggour, T. G. Holesinger, and F. J. Baca, Correlation Between Pressure Dependence of Critical Temperature and the Reversible Strain Effect on the Critical Current and Pinning Force in Bi2Sr2CaCu2O8+x Wires , IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 22, NO. 1, FEBRUARY 2012 8400307. [3] X. F. Lu, N. Cheggour, T. C. Stauffer, C. C. Clickner, L. F. Goodrich, U. Trociewitz, D. Myers, and T. G. Holesinger, Electromechanical Characterization of Bi-2212 Strands , IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 21, NO. 3, JUNE 2011. [4] D.R. Dietderich et al., Critical current variation of Rutherford cable of Bi-2212 in high magnetic fields with transverse stress, Physica C 341, 2599-2600 (2000). [5] Daniel R. Dietderich, Ronald M. Scanlan, Takayo Hasegawa, Yuji Aoki, Robert S. Sokolowski, and Leszck R. Motowidlo, Critical Current Variation as a Function of Transverse Stress of Bi-2212 Rutherford Cables , IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. I I, NO. 1, MARCH 2001. 5 5 Fabrizio Berritta | Models of High Specific Heat Nb3Sn wires
