Prediction of fatigue crack propagation life in notched members under variable amplitude loading

摘要: One of the interesting phenomenon in study fatigue crack propagation under variable amplitude load cycling is growth retardation that normally occurs due to application a periodic overload. Fatigue rate simple loading sequence incorporating period overloads studied using single edge notched specimens AISI304 stainless steel. Load interaction effects and multiple overload have been addressed. Substantial observed introduction tensile overloads. Estimates life obtained employing Wheeler model (using Paris modified equations) Elber’s model. Analytical predictions are compared with experimental results. Results these analytical show good agreement data. rates also evaluated from fractographic striations seen on fracture surface. Good was found between experimentally determined by studies.