SEDL / STP / STP942-EB / STP24537S

The Improved Neuber's Rule and Low Cycle Fatigue Life Estimation

Y-S, Wu
Scientific Work, Institute of Mechanics, Chinese Academy of Sciences, Beijing,

Pages: 15    Published: Jan 1988

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Abstract

An elastic-plastic finite element (FE) analysis was performed on the Society for Automotive Engineers (SAE) keyhole specimen in order to evaluate the prediction capability of Neuber's rule. Twenty different material properties were considered in the FE analyses. It was found that the accuracy of Neuber's rule is dependent on the material properties. In order to improve the prediction capability a new parameter concerning the material properties was introduced into Neuber's rule. The further improved Neuber's rule exhibits the format, Kt=KδmKε(1−m) The relation between m (exponent) and the material properties was studied. For the RQC-100 SAE keyhole specimen, stress-strain analyses and low cycle fatigue (LCF) life estimations were performed by both the conventional Neuber's rule and the extended rule.