Notch Root Displacement (NRD) Approach to Predict Crack Initiation Life of Notched Specimen in High-Temperature Multiaxial Low Cycle Fatigue

[+] Author and Article Information
Hiroshi Umeda

Department of Mechanical Engineering, Faculty of Science and Engineering, Hiroshima-Denki Institute of Technology, 6-20-1 Nakano Aki-ku Hiroshima, 739-03, Japan

Masao Sakane, Masateru Ohmani

Department of Mechanical Engineering, Ritsumeikan University, 56-1 Tojiin Kita-machi Kita-ku Kyoto, 603, Japan

J. Eng. Mater. Technol 112(4), 429-434 (Oct 01, 1990) (6 pages) doi:10.1115/1.2903353 History: Received November 08, 1988; Revised November 12, 1989; Online April 29, 2008


This paper describes the notch root displacement (NRD) approach to assess the crack initiation life of notched specimens in high-temperature multiaxial low cycle fatigue. Two and three-dimensional finite element method (FEM) analyses were made to estimate the local displacement at the notch root in tension, torsion, and combined tension/torsion. From the FEM analysis, a simple equation which expresses the intensity of the notch root displacement was derived and it was applied to the experimental data. The equation well correlates the crack initiation life of the notched specimen in high-temperature multiaxial low cycle fatigue.

Copyright © 1990 by The American Society of Mechanical Engineers
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