A new method is put forward to predict fatigue life for low cycle nonproportional loading based on the Itoh criterion. The proposed method considers the multi-axiality influence on the reference maximum principal strain path and the calculation of nonproportionality factor by utilizing a multi-axial fatigue life prediction approach based on the modified Wöhler curve method. Different from the hypothesis of previous integral models for computing factor where the loading path is considered uniform, a new model using an inhomogeneous integral is presented and a path-dependent weight factor is defined to describe this inhomogeneity. The experimental tests of Itoh on 304 stainless steel with 14 different loading cases are referenced to examine the validity of the new method.
A New Nonproportional Low Cycle Fatigue Life Prediction Method for Type 304 Stainless Steel
Harbin Institute of Technology,
Harbin 150001, China
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 21, 2018; final manuscript received November 16, 2018; published online February 21, 2019. Assoc. Editor: Steve J. Hensel.
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Liu, B., and Yan, X. (February 21, 2019). "A New Nonproportional Low Cycle Fatigue Life Prediction Method for Type 304 Stainless Steel." ASME. J. Pressure Vessel Technol. April 2019; 141(2): 021402. https://doi.org/10.1115/1.4042122
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