|
|
|
|
|
|
a |
K = DK |
Da |
da/dN*** |
Avg. da/dN |
DN |
Ntotal |
|
m |
MPa m1/2 |
m |
m/cycle |
m/cycle |
cycles |
cycles |
|
3.35E-06* |
0.75075** |
2.54E-12 |
||||
|
5.03E-04 |
9.1996 |
0.0005 |
5.08E-08 |
2.5401E-08 |
19684 |
19684 |
|
1.00E-03 |
12.9885 |
0.0005 |
2.03E-06 |
1.0414E-06 |
480 |
20164 |
|
1.50E-03 |
15.8987 |
0.0005 |
5.08E-07 |
0.00000127 |
394 |
20558 |
|
2.00E-03 |
18.3532 |
0.0005 |
2.03E-05 |
1.0414E-05 |
48 |
20606 |
|
2.50E-03 |
20.5160 |
0.0005 |
1.65E-05 |
1.8415E-05 |
27 |
20633 |
|
3.00E-03 |
22.4717 |
0.0005 |
1.27E-05 |
1.4605E-05 |
34 |
20667 |
|
3.50E-03 |
24.2702 |
0.0005 |
1.02E-05 |
0.00001143 |
44 |
20711 |
|
4.00E-03 |
25.9444 |
0.0005 |
2.54E-06 |
0.00000635 |
79 |
20790 |
|
4.32E-03 |
26.9614 |
0.00032 |
0.000216 |
0.00010922 |
3 |
20793 |
* The calculated pit-to-crack transition length based on Hoeppner's PCF model (considered as the initial crack length).
** The "short" crack stress intensity threshold (DKscth) for 7075-T6 from reference [50]
*** Determined from the plot of da/dN vs. DK for 7075-T73
Review of Pitting Corrosion Fatigue Models, D.W. Hoeppner, V. Chandrasekaran, and A.M.H. Taylor, University of Utah and FASIDE International Inc.