Question 4: (A) The ductile behavior of a certain metal is well described by o = 1000000.3. The metal undergoes uniform work hardening process to a reduction in area of r= 30%, find the yield stress of the work-hardened metal. (5 marks] (B) If the metal in Q4A, governed by the same ductile behavior equation, is cold-worked first by 20% which is still followed by an additional cold work of 15%, find the yield stress of the metal. [10 marks] (C) Provide your comment(s) why the yield stresses in Q4A and Q4B are not the same. (5 marks] [20 marks]
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