Strain-driven corrosion crack growth: A pilot study of intergranular stress corrosion cracking |
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Authors: | AP JivkovP Ståhle |
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Affiliation: | Division of Solid Mechanics, Malmö University, SE-205 06 Malmö, Sweden |
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Abstract: | This work proposes a model for corrosion driven crack growth. The model poses a moving boundary problem, where a chemical attack removes material from the body. The rate of the chemical attack is a function of the strain along the body surface. No crack growth criterion is needed for the analysis. A finite strain formulation is used and the material model is assumed hyperelastic. The problem is stated for a large body, containing a large crack. A low frequency cyclic loading is considered. Thus, corrosion is assumed to dissolve material with a rate approximately proportional to the strain rate. The problem is solved using finite element method based program, enhanced with a procedure handling the moving boundary. Parametric studies are performed for a series of different initial shapes of the near-tip region. Presented results show that the crack growth rate is largely dependent on the initial crack geometry. For a set of initial shapes and load levels steady-state conditions of growth are achieved, while for the others the cracks show tendency to branch. |
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Keywords: | Stress-corrosion crack growth Crack tip geometry Finite strains Finite elements Interphase thickness |
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