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The sensitivity of crack growth resistance to the choice of isotropic orkinematic hardening is investigated. Monotonic mode I crack advance under smallscale yielding conditions is modelled via a cohesive zone formulation endowedwith a traction-separation law. R-curves are computed for materials thatexhibit linear or power law hardening. Kinematic hardening leads to an enhancedcrack growth resistance relative to isotropic hardening. Moreover, kinematichardening requires greater crack extension to achieve the steady state. Thesedifferences are traced to the non-proportional loading of material elementsnear the crack tip as the crack advances. The sensitivity of the R-curve to thecohesive zone properties and to the level of material strain hardening isexplored for both isotropic and kinematic hardening.

Crack growth resistance in metallic alloys: the role of isotropic versus kinematic hardening