Astructural component is fabricated from an alloy that has a plane strain fracture toughness of 45 mpa √ m . it has been determined that this component fails at a stress of 300 mpa when the maximum length of a surface crack is 0.95 mm. what is the maximum allowable surface crack length (in mm) without fracture for this same component exposed to a stress of 300 mpa and made from another alloy with a plane strain fracture toughness of 57.5 mpa √ m