Environmental Engineering Reference
In-Depth Information
(a)
0
d = fixed
-10
C
-
C
+
-20
N
+
·
·
ε
N
+ <
ε
C
+
ε
C
- <
ε
N
-
ε
N
+ <
ε
C
-
N (A
¬
·
·
-30
·
·
·
·
ε
N
- <
ε
N
+
N (B
α
-
)
ε
C
- <
ε
N
+
C (B
α
-
)
N
-
·
·
·
·
ε
C
+ <
ε
C
-
C (A
¬
+
)
+
)
-40
1.0
1.5
2.0
2.5
(
T
m
/
T
)
(b)
0
-10
C
-
C
+
-20
N
+
·
·
·
·
ε
N
- <
ε
N
+
ε
C
+ <
ε
C
-
ε
N
- >
ε
C
+
N (B
α
+
)
ε
N
- <
ε
N
+
ε
C
+ <
ε
C
-
ε
C
- >
ε
N
-
C (A
¬
+
)
·
·
·
·
-30
N
-
·
·
·
·
-40
1.0
1.5
2.0
2.5
(
T
m
/
T
)
3.26
Transitions in creep mechanisms in ceramics for transport paths.
Suggested by (a) Gordon and (b) Chokshi.
as demonstrated by Li
et al
.
107
As noted in Fig. 3.27a, the stress exponent
decreases with increasing stress.
By introducing a friction stress (
0
) the creep behavior of this alloy could
be described by the following equation:
τ
n
⎛
⎜
⎞
⎛
⎜
⎞
Q
RT
ττ
0
−
exp
γ
[3.62 ]
A
⎛
⎝
⎛
⎝
=
G
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