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RESEARCH PAPERS

A Criterion for Low-Cycle Fatigue Failure Under Biaxial States of Stress

[+] Author and Article Information
D. Lefebvre, K. W. Neale, F. Ellyin

Université de Sherbrooke, Sherbrooké, Quebec, Canada

J. Eng. Mater. Technol 103(1), 1-6 (Jan 01, 1981) (6 pages) doi:10.1115/1.3224968 History: Received September 17, 1979; Revised June 20, 1980; Online September 15, 2009

Abstract

The plastic strain energy required for failure in low-cycle biaxial fatigue is estimated using the energy in uniaxial fatigue and assumptions from the theory of plasticity. A criterion for high-strain multiaxial fatigue of the form

Δεp Δσ=K Nƒc
is developed, where the equivalent stress amplitude Δσ and the equivalent plastic strain amplitude Δε p are based on the von Mises yield function of plasticity. The parameters K and c are assumed to depend on the mechanical properties of the material and to be functions of the stress ratio. These functions can be evaluated from uniaxial fatigue data and are compared with tests performed on thin-walled tubes of mild steel at different stress ratios. The proposed criterion seems to yield a promising approach for the low-cycle fatigue analysis of metals under biaxial states of stress.

Copyright © 1981 by ASME
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