Interactions of two collinear and parallel a/b-plane cracks in REBCO （where RE is a rare-earth element and usually Y is adopted） bulk superconductors under the Lorentz force resulted from the applied magnetic field ...Interactions of two collinear and parallel a/b-plane cracks in REBCO （where RE is a rare-earth element and usually Y is adopted） bulk superconductors under the Lorentz force resulted from the applied magnetic field are studied. By using the derived boundary integral equation for the crack problem of a cylindrical bulk superconductor under the applied magnetic field, we comprehensively investigate the stress intensity factor （SIF） of modes I and II at the crack tips of the two collinear and parallel cracks with their sizes, relative positions and the applied magnetic field. The calculated results show that in most cases, the SIF of mode I is found to be about tens of times of the one of mode II, and all the SIFs are always proportional to increase in the applied magnetic field, and the cracks near the center are more dangerous due to the larger Lorentz force.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11372096 and 11402073the National Research Foundation for the Doctoral Program of Higher Education of Chinathe Natural Science Foundation of Jiangsu Province under Grant No BK20130824
文摘Interactions of two collinear and parallel a/b-plane cracks in REBCO （where RE is a rare-earth element and usually Y is adopted） bulk superconductors under the Lorentz force resulted from the applied magnetic field are studied. By using the derived boundary integral equation for the crack problem of a cylindrical bulk superconductor under the applied magnetic field, we comprehensively investigate the stress intensity factor （SIF） of modes I and II at the crack tips of the two collinear and parallel cracks with their sizes, relative positions and the applied magnetic field. The calculated results show that in most cases, the SIF of mode I is found to be about tens of times of the one of mode II, and all the SIFs are always proportional to increase in the applied magnetic field, and the cracks near the center are more dangerous due to the larger Lorentz force.
