The mixed mode crack growth rate in cruciform specimens subject to biaxial loading

Effect of different environmental conditions on surface crack growth in aluminum alloys

“…The procedure for calculating of the governing parameter of the elastic-plastic stress-strain fields in the form of I n -integral for the different specimen geometries by means of the elastic-plastic FEanalysis of the near crack-tip stress-strain fields suggested by [1][2][3]. In this case, the numerical integral of the crack tip field In changes not only with the strain hardening exponent n but also with the relative crack length b/D and the relative crack depth a/D:…”

“…Third, constrain parameters behaviour and governing parameter of elasticplastic stress field distribution along the crack front was obtained using FEM analysis. Crack growth interpretation is performed using the traditional elastic and new plastic SIF [1][2][3]. It is found that there is a steady relationship between the crack growth rate and the plastic SIF in the form of general curve within a relatively narrow scatter band for all tested specimens at different temperatures.…”

A creep stress intensity factor approach to creep–fatigue crack growth

“…In [13][14][15][16], a plastic stress intensity factor for fracture toughness and the mixed mode crack growth rate was introduced, based on the analytical form of the elastic-plastic stress and strain fields in the vicinity of the crack tip. This plastic SIF directly relates to the elastic-plastic fracture mechanics parameter, J-integral.…”

“…Generally, studies [13][14][15][16] have focused on the background for the characterization of static and cyclic fracture resistance materials and structures using one unified parameter in the form of the plastic SIF, which take into account both in-plane and out-of-plane constraint effects at fracture. The proposed approach follows the approach found in [13][14][15][16] and will allow a more general expression to be obtained for the first term creep crack tip singularity field, which considers the dependence of a governing parameter on both the crack front curvature and the constraint.…”

“…The approach follows that in [13][14][15][16], whereby the plastic stress intensity factor (SIF) was introduced for the different geometry of several test specimens to take into account in-plane and out-of-plane constraint effects at fracture. Equations are also proposed for calculating I n -factor at both the deepest point along the crack front and at the crack tip on the surface.…”