表面き裂の開口変位分布計測に基づく応力拡大係数と疲労き裂伝ぱ速度の評価

概要

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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 K_<est>-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 K_<est>-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.
社団法人日本機械学会の論文
2004-04-25