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Fracture behavior in nickel-titanium (NiTi) shape memory alloys (SMAs)subjected to mode-I, isothermal loading is studied using finite elementanalysis (FEA). Compact tension (CT) SMA specimen is modeled in Abaqus finiteelement suite and crack growth under displacement boundary condition isinvestigated for plane strain and plane stress conditions. Parameters for theSMA material constitutive law implemented in the finite element setup areacquired from characterization tests conducted on near-equiatomic NiTi SMA.Virtual crack closure technique (VCCT) is implemented where crack is assumed toextend when the energy release rate at the crack-tip becomes equal to theexperimentally obtained material-specific critical value. Load-displacementcurves and mechanical fields near the crack-tip in plane strain and planestress cases are examined. Moreover, a discussion with respect to the crackresistance R-curves calculated using the load-displacement response for planestrain and plane stress conditions is presented.

Crack Growth Behavior in NiTi Shape Memory Alloys Under Mode-I Isothermal Loading: Effect of Stress State