Surface crack and cracks networks in biaxial fatigue |
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Authors: | A. Kane |
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Affiliation: | Laboratoire de Mécanique des Solides, UMR-CNRS 7649, Ecole Polytechnique, 91128 Palaiseau cedex, France |
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Abstract: | Semi-elliptical fatigue crack growth in 304 L stainless steel, under biaxial loading, was investigated. Compared to those of through-cracks under uniaxial loading, the growth rate of surface cracks is increased by a non-singular compressive stress and reduced by a tensile stress, when R = 0. Plasticity-induced crack closure under biaxial loading was investigated through 3D finite element simulations with node release. Roughness and phase-transformation-induced closure effects were also discussed. The interactions in two-directional crack networks under biaxial tension were investigated numerically. It appears that the presence of orthogonal cracks should not be ignored. The beneficial influence of interaction-induced mode-mixities was highlighted. |
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Keywords: | Surface cracks Biaxial fatigue Multiple cracking Closure effects |
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