A specimen of a 4340 steel alloy having a plane strain fracture toughness of 45 MPa m

Question:

A specimen of a 4340 steel alloy having a plane strain fracture toughness of 45 MPa √m (41 ksi √in.) is exposed to a stress of 1000 MPa (145,000 psi). Will this specimen experience fracture if it is known that the largest surface crack is 0.75 mm (0.03 in.) long? Why or why not? Assume that the parameter Y has a value of 1.0.