A framework of modelling slip-controlled crack growth in polycrystals using crystal plasticity and XFEM

Short cracks tend to develop at high and irregular rates compared macroscopic cracks, making the prediction of fatigue life a challenging task. In this work, numerical framework combining crystal plasticity model Extended Finite Element Method (XFEM) is applied study slip-controlled short crack growth in polycrystal superalloy RR1000. The calibrated from experiments used evaluate paths rates. Two fracture criteria are compared: onset controlled by total individual cumulative shear strain respectively, grows either perpendicular direction maximum principal or along crystallographic directions.