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FEA calculations of stress intensity factor K as function of reduced crack size c/w, for extension of periodic array of cracks in curved bilayer slice. Solid curves are calculations for crack arrays in inhomogeneous contact stress field, with w/d = 0.1 mm/1.8 mm = 0.055. Heavy dashed curve is for single crack in same stress field. Light dashed curve is for same single crack under uniform stress σ.
