3D effects around notch and crack tips
作者： Rafael Cesar de Oliveira Góes , Jaime Tupiassú Pinho de Castro , Luiz Fernando Martha
DOI: 10.1016/J.IJFATIGUE.2013.10.014
关键词: Fatigue testing 、 Crack closure 、 Finite element method 、 Stress–strain curve 、 Structural engineering 、 Stress concentration 、 High stress 、 Crack tip opening displacement 、 Materials science 、 Elasticity (physics)
摘要: Abstract Notches and cracks are usually treated as two-dimensional problems in most structural design analysis applications, employing 2D limit solutions from plane elasticity theories to evaluate highly localized stress/strain concentration effects around their tips. However, such also associated high stress gradients, which cause three-dimensional fields those tips that can severely restrict local Poisson-induced transversal strains. Modeling of fatigue crack initiation propagation, estimation plastic zone sizes shapes, constraint typical affected by 3D effects, may lead non-conservative damage life predictions if neglected. To quantify how important they be practical first traditional finite element techniques used simulate component thickness notch tip radius the strain along tips, importance point view. Then, versatile sub-modeling study similar fronts short long cracks. Finally, a stepwise remeshing routine is show an initially straight must slightly curve its front during propagation fatigue, due unavoidable always surround real
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