Prediction of fatigue crack propagation life in notched members under variable amplitude loading
- King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia). Mechanical Engineering Dept.
One of the interesting phenomenon in the study of fatigue crack propagation under variable amplitude load cycling is the crack growth retardation that normally occurs due to the application of a periodic overload. Fatigue crack growth rate under simple variable amplitude loading sequence incorporating period overloads is studied using single edge notched specimens of AISI 304 stainless steel. Load interaction effects due to single and multiple overload have been addressed. Substantial retardation of fatigue crack growth rate is observed due to the introduction of periodic tensile overloads. Estimates of fatigue life have been obtained employing Wheeler model (using Paris and modified Paris equations) and Elber`s model. Analytical predictions are compared with experimental results. Results of these analytical fatigue life predictions show good agreement with the experimental results. Results of these analytical fatigue life predictions show good agreement with the experimental fatigue life data. Fatigue crack propagation rates also have been evaluated from the fractographic study of fatigue striations seen on the fracture surface. Good agreement was found between the experimentally observed crack growth rates and the fatigue crack growth rates determined by the fractographic studies.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 514704
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 3 Vol. 6; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
Similar Records
An experimental investigation of fatigue crack growth of stainless steel 304L
Fracture mechanics life analytical methods verification testing. Final report, 1 September 1991-12 September 1994