Abstract
Mode I stress intensity factors for part-through crack were evaluated from the crack opening displacement distributions measured along the crack on the surface in a finite plate. This method was originally proposed for a through crack in a finite plate using complex valued-formulae of a crack in an infinite plate and was extended to a part-through crack in a finite plate. For the analytical results using FEM analyses, the stress intensity factor Kest-values obtained by this method showed close agreement with stress intensity factors calculated from Newman-Raju's equation. Furthermore, for the experimental results using annealed cracks without residual stresses, the evaluated Kest-values were in good agreement with the stress intensity factors calculated from Newman-Raju's equation. This method was also useful to evaluate the fatigue crack propagation rate of part-through cracks with the compressive residual stress in the wake of the propagating fatigue cracks, even though applied stresses and residual stress distributions are unknown in materials.
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