... The outer radius, r0, is the radial distance at which the approximate, asymptotic singular solutions deviate significantly (say, by more than 10%) from full elasticity solutions ... that,19ar 1.00where is the crack length.aFor Mode I:Plane Stress:EKI2Plane Strain: 16 Plane Strain: 221EKIExample ProblemSize RequirementsConsider a low strength ... RequirementsKIc TestASTM standard E399 (1974) for KIctesting (specimen dimensions large compared to plastic zone):25.2,,IcKBba215.2,,ysBbaSubstitute...