A part made from annealed AISI 1018 steel undergoes a 20 percent cold-work operation. Obtain the yield strength and ultimate strength before and after the cold-work operation.

Respuesta :

Answer:

yield strength before cold work = 370 MPa

yield strength after cold work = 437.87 MPa

ultimate strength before cold work = 440 MPa

ultimate strength after cold work = 550 MPa

Explanation:

given data

AISI 1018 steel

cold work factor W = 20% = 0.20

to find out

yield strength and ultimate strength before and after the cold-work operation

solution

we know the properties of AISI 1018 steel is

yield strength σy =  370 MPa

ultimate tensile strength σu = 440 MPa

strength coefficient K = 600 MPa

strain hardness n = 0.21

so true strain is here ∈ = [tex]ln\frac{1}{1-0.2}[/tex] = 0.223

so

yield strength after cold is

yield strength = [tex]K \varepsilon ^n[/tex]

yield strength =  [tex]600*0.223^{0.21)[/tex]

yield strength after cold work = 437.87 MPa

and

ultimate strength after cold work is

ultimate strength = [tex]\frac{\sigma u}{1-W}[/tex]

ultimate strength = [tex]\frac{440}{1-0.2}[/tex]

ultimate strength after cold work = 550 MPa