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Derivation of constraint-dependent JaR curves based on modified $T$ -stress parameter and GTN model for a low-alloy steel
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Derivation of constraint-dependent JaR curves based on modified $T$ -stress parameter and GTN model for a low-alloy steel
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Journal Article
Derivation of constraint-dependent JaR curves based on modified $T$ -stress parameter and GTN model for a low-alloy steel
2013
Overview
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 JaR curves by using the GursonaTvergaardaNeedleman (GTN) model for the SENB specimens with different $a/W$ , the equations of constraint-dependent JaR curves for the A508 steel were obtained. The predicted JaR curves using the equations essentially agree with the experimental and calculated JaR curves. The transferability of the constraint-dependent JaR 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 JaR curves for ductile materials.
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