A new non-proportional low cycle fatigue life prediction method for type 304 stainless steel

[+] Author and Article Information
Bowen Liu

Research Lab on Composite Materials, Harbin Institute of Technology, 150001, P.R.China

Yan Xiangqiao

Research Lab on Composite Materials, Harbin Institute of Technology, 150001, P.R.China

1Corresponding author.

ASME doi:10.1115/1.4042122 History: Received June 21, 2018; Revised November 16, 2018


A new method is put forward to predict fatigue life for low cycle non-proportional loading based on the Itoh criterion. The proposed method considers the multiaxiality influence on the reference maximum principal strain path and the calculation of non-proportionality factor Fnp by utilizing a multiaxial fatigue life prediction approach based on the Modified Wöhler Curve Method. Different from the hypothesis of previous integral models for computing factor Fnp 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.

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