Part 1: [5 marks]\ A structural component in the form of a wide plate is to be fabricated from a steel alloy that has a plane strain fracture toughness of

77.0MPa\\\\sqrt(m)

and a yield strength of

1400MPa

. The flaw size resolution limit of the flaw detection apparatus is

4.0mm

. If the design stress is one half of the yield strength and the value of

Y

is 1.0. Determine whether or not a critical flaw for this plate is subject to detection.\ Part 2: [8 marks]\ For some metal alloy, a true stress of

415MPa(60,175\\\\psi )

produces a plastic true strain of 0.475 . How much will a specimen of this material elongate when a true stress of

325MPa(46,125\\\\psi )

is applied if the original length is

300mm

(11.8 in.)? Assume a value of 0.25 for the strainhardening exponent

n

.\ Part 3: [ 2 marks]\ For the following, indicate which will be more ductile, and provide a brief (one sentence) explanation as to why?\ Pure copper solidified at

900\\\\deg C

, or pure copper solidified at

600\\\\deg C

\ Windows

Part 1: [5 marks] A structural component in the form of a wide plate is to be fabricated from a steel alloy that has a plane strain fracture toughness of 77.O MPa m and a yield strength of 1400MPa. The flaw size resolution limit of the flaw detection apparatus is 4.0mm. If the design stress is one half of the yield strength and the value of Y is 1.0 . Determine whether or not a critical flaw for this plate is subject to detection. Part 2: [8 marks] For some metal alloy, a true stress of 415MPa(60,175psi) produces a plastic true strain of 0.475 . How much will a specimen of this material elongate when a true stress of 325MPa(46,125psi) is applied if the original length is 300mm (11.8 in.)? Assume a value of 0.25 for the strain-hardening exponent n. Part 3: [ 2 marks] For the following, indicate which will be more ductile, and provide a brief (one sentence) explanation as to why? Pure copper solidified at 900C, or pure copper solidified at 600C