Abstract
Crack propagation rate of a model surface crack in a plate, the crack tip opening stresses or displacements under various biaxial stress ratios by the simultaneous action of plane bending and cyclic torsion are examined. The aspect ratio of a crack is not affected by the biaxial stress ratio but the relationship between the propagation rate da/dN and the stress intensity factor range ΔK or the effective stress intensity factor range Δ Keff depends on it. This is mainly due to the differences of both CTOD and the scale of the slipped region at the crack tip caused by the difference of biaxial stress ratio.
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