A metal object is required to have a yield strength of at least 310 MPa (45,000

Question

A metal object is required to have a yield strength of at least 310 MPa (45,000 psi) and a minimum ductility (% elongation; % EL) of 27%. If the metal is to be cold worked to its final shape, decide and carefully justify which (if any) of the following are candidates: copper, brass, and a 1040 steel Relevant data are attached. PLEASE SHOW ALL WORK AND EXPLANATION IF NECESSARY

A metal object is required to have a yield strength of at least 310 MPa (45,000 psi) and a minimum ductility (% elongation; % EL) of 27%. If the metal is to be cold worked to its final shape, decide and carefully justify which (if any) of the following are candidates: copper, brass, and a 1040 steel Relevant data are attached. PLEASE SHOW ALL WORK AND EXPLANATION IF NECESSARY

Explanation / Answer

Brass is the answer.

Copper has a yield strength of 310MPa at percent cold work of 40. But, at percent cold work of 40, the ductility of copper is less than 10<27.

Ductility of steel is less than 27% throughout.

So, Brass fulfills all the criteria.

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