A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 55 MPa v m (50 ksivin.)55 MPam (50 ksiin.). If, during service use,

the plate is exposed to a tensile stress of 200 MPa (29,000 psi) determine the minimum length (in m) of a surface crack that will lead to fracture. Assume a value of 1.0 for Y.