SYMPOSIA PAPER Published: 01 January 1993

Inelastic Stress-Strain Predictions for Multiaxial Fatigue Damage Evaluation


The inelastic stress-strain response of a material subjected to complex loading must be known or estimated in order to predict the fatigue life of a component using many current multiaxial fatigue damage models. This paper presents stress-strain predictions obtained using two incremental plasticity algorithms for several nonproportional loading paths.

The two algorithms both employ von Mises yield surfaces with kinematic hardening. However, one algorithm translates a single yield surface within a stationary limit surface using the hardening rules specified by Mróz and invokes a radial return for neutral loading. The other algorithm translates multiple yield surfaces (or a field of plastic moduli) according to a modified Mróz hardening rule proposed by Garud with no neutral loading provision. The algorithms are used to predict stress histories that are compared with measured responses from strain-controlled tests on normalized 1045 thin-walled tubes. A variety of nonproportional load paths were investigated. In general, relatively good agreement between predicted and measured stress-strain response for the two algorithms was observed for application to multiaxial fatigue evaluation. Strengths and weaknesses of each model are discussed.

Author Information

Tipton, SM
The University of Tulsa, Tulsa, OK
Bannantine, JA
IBM, San Jose, CA
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Developed by Committee: E08
Pages: 273–297
DOI: 10.1520/STP24807S
ISBN-EB: 978-0-8031-5243-4
ISBN-13: 978-0-8031-1862-1