S Gradebook HW8 HW8.4. Homework9-Fracture toughness with plastic zone For a titanium alloy having a surface elliptical flaw of size a, the effect of plastic zone can be included empirically in the calculation of the fracture stress as OF = KIC 1.38 -0.212 (or) 27 1/2 1.20 That is, the plastic zone effectively increases the radius of curvature at the crack tip ("blunting"). Material properties: KIC 106 MPam, oy = 920 MPa. = Calculate the deepest crack length that can be tolerated and still avoid crack propagation at an operating stress equal to 50% of the alloy's yield strength. Length = mm. Save & Grade Single attempt Save only Additional attempts available with new variants