| Autor: |
Dragan, V. I., Semenyuk, S. M., Mitchenko, E. I., Merkulov, V. O. |
| Zdroj: |
Strength of Materials; May 1990, Vol. 22 Issue: 5 p678-684, 7p |
| Abstrakt: |
Experimental data are presented for the fatigue strength of smooth specimens, specimens with a stress concentrator, and specimens under fretting corrosion conditions for alloy D16AT at three levels of loading cycle asymmetry coefficient R = -1, 0, and -0.5. It is established that fatigue resistance for alloy D16AT under fretting corrosion conditions is governed by the amplitude of operating stresses but it is practically independent of changes in loading cycle asymmetry coefficient. The possibility is demonstrated of calculating the fatigue limit for specimens with a stress concentrator with different loading cycle asymmetry from known values of the threshold stress intensity factor, the theoretical stress concentration factor, and the length of an nondeveloping crack at fatigue limit. Limiting stress amplitude diagrams for smooth specimens under fretting corrosion conditions have a different nature for the relationship between amplitude and average stresses of the loading cycle and therefore they cannot be described by a general analytical expression. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink