True Stress (σT True stress is the stress determined by the ...

[Pages:10]True Stress (T)

True stress is the stress determined by the instantaneous load acting on the

instantaneous cross-sectional area

True stress is related to engineering stress: Assuming material volume remains constant

Aol o = Al

T

=

P A

=

P * Ao A Ao

=

P Ao

* Ao A

A o=

l

=+lo =

+ 1 = (1 + )

A lo

lo

lo

= P (1+ ) = (1+ ) A T

o

True Strain (T)

The rate of instantaneous increase in the instantaneous gauge length.

T =

dl l

=

ln

l lo

T

=

ln

lo

+ l lo

ln

l l

o o

+

l lo

T = ln( 1 + )

Strain Hardening Parameter (n)

T = KT n

Strain hardening parameter

T n = d T

T

d T

0 ................
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