Relaxation of Shot Peening Induced Residual Stresses in Ti-6Al-4V ...
Relaxation of Shot Peening Induced Residual Stresses in Ti-6Al-4V ...
Relaxation of Shot Peening Induced Residual Stresses in Ti-6Al-4V ...
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Max Applied Stress (MPa)<br />
800<br />
600<br />
400<br />
200<br />
0<br />
1000 10 4<br />
No <strong>Peen<strong>in</strong>g</strong><br />
Average 6-8A SP<br />
6-8A SP + 250C / 10 hrs.<br />
6-8A SP + 325C / 10 hrs.<br />
6-8A SP + 400C / 10 hrs.<br />
10 5<br />
15<br />
10 6<br />
10 7<br />
Propagation Life (Cycles)<br />
Figure 6: LEFM Predictions for <strong>Ti</strong>-<strong>6Al</strong>-<strong>4V</strong> basel<strong>in</strong>e, 6-8A shot peened, and 6-8A shot peened+ isothermal<br />
exposure. (Semi-elliptical surface flaw a = c = 0.508mm <strong>in</strong> <strong>Ti</strong>-<strong>6Al</strong>-<strong>4V</strong> plate t = 100 mm, w = 400 mm.)<br />
10 8
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