suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40 MPa.

suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40 MPa. It has been determined that fracture results at a stress of 365 MPa when the maximum internal crack length is 2.6 mm long. For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 4.0mm