A steel wire is drawn from an initial diameter (di) of 10 mm to a final diameter (df) of 7.5 mm. The half cone angle ( ) of the die is 5 and the coefficient of friction ( ) between the die and the wire is 0.1. The average of the initial and final yield stress [( y )avg] is 350 MPa. The equation for drawing stress f. (in MPa) is given as: The drawing stress (in MPa) required to carry out this operation is (correct to two decimal places).

A steel wire is drawn from an initial diameter (di) of 10 mm to a fina

1.	A steel wire is drawn from an initial diameter (di) of 10 mm to a final diameter (df) of 7.5 mm. The half cone angle ( ) of the die is 5 and the coefficient of friction ( ) between the die and the wire is 0.1. The average of the initial and final yield stress [( y )avg] is 350 MPa. The equation for drawing stress f. (in MPa) is given as: The drawing stress (in MPa) required to carry out this operation is (correct to two decimal places).
A.	316.25 MPa
B.	- 316.25 MPa
C.	314.25 MPa
D.	315.25 MPa
Answer» B. - 316.25 MPa

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