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- Title
Ratcheting behaviour and mean stress considerations in uniaxial low-cycle fatigue of Inconel 718 at 649 °C.
- Authors
PARK, S. J.; KIM, K. S.; KIM, H. S.
- Abstract
The ratcheting behaviour of Inconel 718 was investigated at 649 °C under uniaxial cyclic loading. Stress-control tests have been conducted at various combinations of stress amplitude and mean stress. The ratcheting strain at failure increases with increasing mean stress for a given stress amplitude and with decreasing stress amplitude for a given mean stress. Fatigue lives were correlated using three mean stress models: the Goodman equation, the Smith–Watson–Topper (SWT) parameter and the Walker parameter. It has been shown that the Goodman equation and the SWT parameter do not correlate life data, while the Walker parameter yields acceptable correlation. The SWT parameter was modified to incorporate the ratcheting effect. The new parameter is found to yield correlation similar to that of the Walker parameter.
- Subjects
STRESS concentration; INCONEL; ALLOY fatigue; CHROMIUM-iron-nickel alloys; STRAINS &; stresses (Mechanics); ELASTIC solids; STRUCTURAL analysis (Engineering)
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2007, Vol 30, Issue 11, p1076
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2007.01177.x