3D Numerical Study on how the Local Effective Stress Intensity Factor Range Can Explain the Fatigue Crack Front Shape

Abstract:

The plasticity-induced crack closure of through-thickness cracks, artificially obtained from short cracks grown in CT specimens of 304L austenitic stainless steel, is numerically simulated using finite elements. Crack advance is incremented step by step, by applying constant ΔK amplitude so as to limit the loading history influence to that of crack length and crack wake. The calculation of the effective stress intensity factor range, ΔK_eff, along curved shaped crack fronts simulating real crack fronts, are compared to calculation previously performed for through-thickness straight cracks. The results for the curved crack fronts support that the front curvature is associated to constant ΔK_eff amplitude, thus assumed to be the propagation driving force of the crack all along its front.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 295-300
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.295
• Online since: March 2014
• Authors: Catherine Gardin*, Saverio Fiordalisi, Christine Sarrazin-Baudoux, Jean Petit
• Keywords: 3D Finite Element Modeling, Crack Front Shape, Effective Stress Intensity Factor Range, Plasticity-Induced Crack Closure, Stainless Steel (SS)

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