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RESEARCH PAPERS

High Temperature Multiaxial Low Cycle Fatigue of Cruciform Specimen

[+] Author and Article Information
Takamoto Itoh

Department of Mechanical Engineering, Fukui University, Fukui-shi, 910, Japan

Masao Sakane, Masateru Ohnami

Department of Mechanical Engineering, Ritsumeikan University, Kyoto, 603, Japan

J. Eng. Mater. Technol 116(1), 90-98 (Jan 01, 1994) (9 pages) doi:10.1115/1.2904261 History: Received July 04, 1991; Revised July 12, 1993; Online April 29, 2008

Abstract

This paper describes high temperature multiaxial low cycle fatigue lives of type SUS304 stainless steel and 1Cr-1Mo-1/4V steel cruciform specimens at 923K and 823K in air. Strain controlled multiaxial low cycle fatigue tests were carried out using cruciform specimens at the principal strain ratios between −1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Multiaxial low cycle faitgue strain parameters were applied to the experimental data and the applicability of the parameters was discussed. The equivalent strain based on crack opening displacement (COD strain) developed in the paper and Γ* —plane parameter successfully predicted multiaxial low cycle fatigue lives. The crack morphology was also extensively discussed from not only the surface crack direction but also the crack inclination into the specimen.

Copyright © 1994 by The American Society of Mechanical Engineers
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