Journal of Theoretical
and Applied Mechanics

40, 2, pp. 389-399, Warsaw 2002

Concept of a non-proportionality parameter in a complex fatigue load state

Dariusz Skibicki, Janusz Sempruch
The article describes a concept of a stress parameter of the fatigue load non-proportionality. The parameter enables quantitative estimation of the load non-proportionality state. A criterion for the fatigue strength has been proposed on the basis of the parameter. The criterion verification results are
presented in the article.
Keywords: multiaxial fatigue; non-proportional loading