Environmental Engineering Reference
In-Depth Information
10
0
(a)
PM 2124 Al
10
-1
678K
648K
618K
10
-2
10
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10
-9
1
10
Shear stress
100
(b)
18
PM 2124 Al
T
= 678K
16
14
12
10
II
8
6
I
4
5
10
15
20
25
30
Shear stress (MPa)
3.27
(a) Strain rate vs stress in PM 2124 Al as a function of temperature
and (b) determination of threshold stress through back-extrapolation.
107
where
0
is the
threshold stress and the rest of the terms are as described previously.
Following the introduction of the threshold stress, the creep strain rates,
is the strain rate of deformation,
τ
is the applied stress,
τ
γ
1/
n
, are plotted on a linear scale against the applied stress. Here
n
is chosen
γ
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