Drawing of rods, wires and tubes

If redundant work is included in Eq.9, the expression becomes
σ
xa
Ab
= φσ o ln ( 1+
B)
A
Where φφφφ is a factor for the influence of redundant work,
which can be defined as
( α )
a
φ = f , r =
Where φφφφ = the redundant work factor.
ε* = the ‘enhanced strain’ corresponding to the yield stress
of the metal, which has been homogeneously deformed
to a strain εεεε.
Suranaree University of Technology Tapany Udomphol
Jan-Mar 2007
*
ε
ε
…Eq.10
…Eq.11