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Title: New approach to fatigue life prediction of notched specimen under non-proportional loading
Authors: Jin, Dan
Tian, Dajiang
Gou, Zhifei
Li, Jianghua
Keywords: Mod.9Cr-1Mo ferrite steel;Notch radius;Fatigue strength reduction factor;Non-proportionality;Fatigue life prediction
Issue Date: Jun-2018
Publisher: NISCAIR-CSIR, India
Abstract: Neuber’s rule and Peterson’s formula are used to calculate the local strain and stress at the notch root based on the fatigue test results of notched specimens of Mod.9Cr-1Mo steel. The critical plane approach, Smith-Watson-Topper (SWT) approach, is used for the fatigue life prediction. It is shown that the prediction results to the notched specimens with smaller notch radius are conservative according to Neuber’s rule but non-conservative when using Peterson’s formula. A new approach to the fatigue strength reduction factor is proposed based on Peterson’s formula by considering the non-proportionality of strain path. With few exceptions, the predictions agree well with the experimental results, and most predictions are in a factor-2 scatter band.
Page(s): 271-275
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.25(3) [June 2018]

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