Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
781134 | International Journal of Fatigue | 2012 | 8 Pages |
A stress-state dependent traction–separation law is combined with an irreversible damage parameter to formulate a cohesive model relevant for life assessment under complex stress-states. Evolution of damage is based on continuum damage laws requiring two cohesive fatigue parameters. For two representative metals, model is able to reproduce typical stress-life response, mean stress effects and sequencing effects under variable amplitude loads. Control of cohesive fatigue parameters on characteristics of the stress-life curve is established, followed by predictions for proportional, cyclic stress-states. With increasing constraint, initiation and growth of damage is more rapid such that higher constraint results in lower life expectancy.
► Stress-state dependent cohesive model combined with irreversible damage parameter. ► Two fatigue cohesive parameters. ► Two representative metals for fatigue response predictions. ► Reproduce trends of uniaxial and biaxial fatigue response.