Derivation of constraint-dependent J–R curves based on modified $$T$$ T -stress parameter and GTN model for a low-alloy steel
Source abstract
Abstract
In this paper, a modified load-independent \(T\)-stress constraint parameter \(\tau *\) was defined. The \(\tau *\) of specimens with different crack-tip constraint levels at different \(J\)-integrals was calculated, and its load-independence has been validated. Based on the modified constraint parameter \(\tau *\) and the numerically calculated J–R curves by using the Gurson–Tvergaard–Needleman (GTN) model for the SENB specimens with different \(a/W\), the equations of constraint-dependent J–R curves for the A508 steel were obtained. The predicted J–R curves using the equations essentially agree with the experimental and calculated J–R curves. The transferability of the constraint-dependent J–R curves to the CT, SENT and CCT specimens was validated. The results show that the modified constraint parameter \(\tau *\) and the GTN model can be effectively used to derive the constraint-dependent J–R curves for ductile materials.
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Research context
OpenAlex topics: Fatigue and fracture mechanics · Metal Forming Simulation Techniques · Numerical methods in engineering
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