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Enhanced multiaxial fatigue criterion that considers stress gradient effects

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)128-139
Number of pages12
JournalInternational Journal of Fatigue
Volume116
DOIs
Publication statusPublished - 1 Nov 2018
Publication typeA1 Journal article-refereed

Abstract

Modification of a fatigue criterion valid for homogeneous multiaxial stress states to account for the beneficial effect of stress gradients is traditionally performed by modifying the stress terms in the fatigue criterion and thereby introducing new parameters that need to be calibrated. Here the stress terms are left unchanged and, instead, the parameters in the fatigue criterion are modified. This modification is performed, in principle, along the lines of Siebel and Stieler and it introduces Neuber's parameter as the only new parameter; however, as soon as the ultimate strength of the material is known, also Neuber's parameter is known. Therefore, the methodology introduced implies that no new calibration process is needed. Here a specific fatigue criterion valid for homogeneous multiaxial stress states is enhanced by this procedure and predictions of this simple approach are compared with a broad range of experimental data and good accuracy is achieved. Moreover, the approach adopted can be applied to other fatigue criteria than the one considered here.

Keywords

  • Fatigue, Gradient effects, Multiaxial fatigue

Publication forum classification

Field of science, Statistics Finland