A specimen of a 4340 steel alloy having a plane

A specimen of a 4340 steel alloy having a plane strain fracture toughness of 45MPavm (41ksivin) is exposed to a stress of 1000MPa (145,000psi). 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.