Prediction of ductile crack formation in uncracked bodies

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Extension of a shear-controlled ductile fracture model considering the stress triaxiality and the Lode parameter (2013, background): “Bao (2003) and Bao and Wierzbicki (2004) carried out fifteen different tests on Al 2024-T351 covering a wide range of the stress triaxiality from 0.3 to 1.0, which provide a schematic clue to the effect of the stress triaxiality and the Lode parameter on the equivalent plastic strain to fracture.”
Numerical failure analysis of a stretch-bending test on dual-phase steel sheets using a phenomenological fracture model (2010, methodology): “The hydrostatic pressure p and mean stress rm are related to I1 through p ¼ rm ¼ 1 3 I1 ð10Þ The second invariant J2 is related to von Mises equivalent stress defined as rMises ¼ ffiffiffiffiffiffiffi 3J2 p ð11Þ It is convenient to work with the dimensionless hydrostatic pressure g, which is defined”
Hybrid experimental–numerical analysis of basic ductile fracture experiments for sheet metals (2010, background): “The corresponding equivalent plastic strain is referred to as fracture strain ef .”