Thermal Stresses in the Large Grain YBaCuO Superconductors During Zero Field Cooling
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We have measured the thermal stresses of the large grain bulk YBaCuO superconductors which had been cooled in a zero magnetic field. During the cooling process from room temperature to 30 K, the axial thermal stress, radial stress, and hoop stress have been obtained by using the strain gauges which had been directly mounted onto the sample surface. It has been found that the maximum tension stress is over 30 MPa along the c axis and the maximum compression stress along the ab axis is over 700 MPa, which should not be neglected when the mechanical properties of these superconductors are considered. The multiphysics analysis software COMSOL has been used to simulate the thermal stresses during the cooling process; it has been confirmed that the large thermal stresses of the superconductors are mainly governed by the thermal expansion coefficients.
KeywordsThermal stress Large grain YBaCuO bulk superconductors Zero field cooling
This work is supported by the Fund of Natural Science Foundation of China (No. 10472038, 11102077, 11032006, 11121202). This work is also supported by the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20090211120010) and Foundation for the Author of National Excellent Doctoral Dissertation of PR China (No. 201135).