3. A steel part made of ASTM A533B-1 steel is fabricated using methods that limit machining flaws to be just smaller than the transition length at at 0 C. In other words, the design criterion is based on plastic yielding instead of catastrophic fracture, when loaded at 0 C. The part : designed for a factor of safety of 1.5 for operation at 0 C. If this part has to now operate at this same load level at -50 C: Temperature, C a. what will the failure mode be (yielding or fracture) ? b. What is the corresponding factor of safety ? Klo Fracture Toughness, MPa/m 160 120 80 40 L -150 60 0 -100 ASTM A533B-1 steel A -50 1000 800 600 400 200 0 Yield Strength, MPa