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The slitting process used for fabrication of REBa2Cu3Ox (REBCO, RE=Rareearth) tapes of required width will greatly improve production efficiency andreduce production costs. However, edge cracks induced by the slitting processof wide REBCO tapes may cause the premature degradation under a extremely highhoop (tensile) stress in high-field magnets. It is necessary to evaluate theedge cracks of REBCO tapes on the critical current (Ic) degradation. This workaims to evaluate the effect of edge cracks on the Ic performance under tensilestress. Ic degradation under artificial cracks was measured to validate theapplicability of linear elastic fracture mechanics for the REBCO film. Linearelastic fracture mechanics was used to get the mixed stress intensity factor ofmultiple edge oblique cracks. A model considering edge crack properties angle\b{eta}, spacing d, and length a is constructed to evaluate the critical loadand critical cracks properties. When the stress intensity factor at the cracktip is less than K_{\rm Ic}=2.3$ $\mathrm{MPa\sqrt{m}}, edge cracks remainstable and do not propagate. Two kinds of REBCO tapes fabricated by differentcompanies are evaluated, and cracks of these tapes will not cause prematuredegradation. This model could be used to evaluate the operation range of REBCOtapes and improve the manufacturing process.

Evaluation of the effect of edge cracks on critical current degradation in REBCO tapes under tensile stress