An annealed copper wire of 25 mm diameter is drawn into

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An annealed copper wire of 25 mm diameter is drawn into a wire of 5 mm diameter. The average yield stress in this operation if the curve of the material is given, σ = 315 ε^0.54 MPa

1. 592 MPa
2. 458 MPa
3. 342 MPa
4. None of these

Correct Option: A

True strain

ε = In	A_i	= In	d_i	= In	25
	A_f		d_f		5

ε = 3.22
σ = 315 ε^0.54 = 315 (3.22)^0.54
σ 592 MPa