A structural component in the form of a very wide plate is to be fabricated from 4340 steel that was cooled using a fast cooling rate and has a yield strength of 1515 MPa and a fracture toughness (KIC) of 60.4MPam. We know that failure due to crack propagation (growth) is dependent on crack length. Some cracks are so small that we can't detect them inside a material. Assume that the minimum detectable crack size is 3mm and that the "Y" geometric constant has a value of 1.0. Assuming that the plate in service will only be loaded up to half of its yield strength, would it be dangerous to use this material?