Creep-fatigue damage assessment in type 316 stainless steel under uniaxial and multiaxial strain cycling at 1150{degree}F
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Engineering Science and Mechanics
- Analytical Services and Materials Inc., Hampton, VA (United States)
This report is the result of a research program on creep-fatigue damage conducted under a Grant from PVRC on engineering materials such as 316 stainless steel. The main objective of the program is to analyze, evaluate and develop a model for creep-fatigue interaction under uniaxial and biaxial stress/strain cycling at elevated temperature. The biaxial loading was torsion coupled with axial loading with 30 minutes hold-time to generate the creep effect. Data was obtained from fatigue-creep tests conducted at 1,150 F (620 C). Based on test data and in-depth macro-micro analysis, a model which accounts for uniaxial creep damage is developed on the basis of ductility-exhaustion concept. A comparison is made between the proposed ductility exhaustion model and the time fraction rule. The proposed model shows a better and more comprehensive predictive capability than the time fraction rule and was able to distinguish whether the failure is by creep or by low cycle fatigue. For creep-fatigue damage under biaxial state of strain/stress cycling, the uniaxial proposed ductility damage concept was modified to account for the biaxial strain/stress effect.
- OSTI ID:
- 109996
- Journal Information:
- Bulletin - Welding Research Council, Journal Name: Bulletin - Welding Research Council Journal Issue: 402; ISSN 0043-2326; ISSN WRCBA2
- Country of Publication:
- United States
- Language:
- English
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