“…In order to assess this damage, this study proposes determining the critical plane criterion involving the SW T and F S models for uniaxial tensile testing conditions. Routines were developed using Matlab software to handle the entire critical plane process directly [6,7]. This includes determining loading angles both in and out of phase, scanning how normal and shear stresses vary in the θ plane, defining and storing the maximum evolution of τ a , σ a , σ n,max , SWT and FS, for each cutting plane, estimating critical planes P SW T −N and P F S −N where stress reaches its maximum value, and calculating life predictions.…”