Type: conference-paper
Abstract: A cohesive fracture model is used to capture the effect of a single peak overload in a ductile 316L steel alloy under plane stress conditions, viz.crack retardation.Previously, the model was used to capture the fatigue life at different loading ratios.The model follows a bi-linear traction-displacement relationship coupled with a nonlinear damage evolution equation.The rate of damage evolution is characterized by three material parameters corresponding to damage accumulation, crack closure and stress threshold.The results indicate that a higher peak load results in higher fatigue crack retardation.The results also agree with experiments that suggest that strain hardening, not crack closure, is the leading mechanism for the overload effect.
Authors: V. R. Krishnan, K. D. Papoulia
Institutions: Cornell University, University of Waterloo
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7045897416