ESTIMATION OF INTERFACIAL SHEAR-STRENGTH BETWEEN SUPERCONDUCTING OXIDES AND SILVER SHEATH FROM MULTIPLE-FRACTURE PHENOMENON OF THE OXIDE

The influences of interfacial shear strength between superconducting Y -Ba-Cu-O and silver and that between Bi-Pb-Sr-Ca-Cu-O and silver on th e multiple fracture of the oxides embedded in silver-sheathed composit e wires, prepared by a powder-in-tube. method, on the multiple fractur e of the oxides was analyzed. The stress distribution in the oxide was calculated based on the proposed method, and the multiple-fracture ph enomenon was simulated by means of a Monte Carlo simulation method. Fr om the comparison of the experimental results with those obtained by t he simulation, the interfacial shear strength between Y-Ba-Cu-O and si lver and that between Bi-Pb-Sr-Ca-Cu-O and silver were estimated to be nearly 30 and 40 MPa, respectively.