The equivalent strain ε for plastic deformation is defined as ____________ (where E=equivalent strain, r=reduction ratio).

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1.	The equivalent strain ε for plastic deformation is defined as ____________ (where E=equivalent strain, r=reduction ratio).
A.	E=ln(r)
B.	E=ln(1-r)
C.	E=ln(1/(1-r))
D.	E=ln(1/r)
Answer» D. E=ln(1/r)

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