Fatigue Criterion Based on the Novoshilov Criterion for Non-proportional Loadings*

Dariusz Skibicki

doi:10.3139/120.110232

Article

Fatigue Criterion Based on the Novoshilov Criterion for Non-proportional Loadings*

Dariusz Skibicki

Published/Copyright: May 28, 2013

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From the journal Materials Testing Volume 53 Issue 6

Abstract

In the present paper the fatigue limit has been calculated under non-proportional loads, proposing a modification of the Huber-von Mises-Hencky criterion, i. e. the Novoshilov interpretation of that criterion was applied. As an effective amplitude, the maximum value of shear stress in the non-proportional load cycle was assumed. There has also been proposed the weight function showing preference of the directions of easy slip in the network A2. Subsequently, verification calculations were performed for respective literature data. The data included experimental fatigue limits reported under biaxial loads which are sinusoidally variable from the phase shift. The present results are compared with the Huber-von Mises-Hencky criterion. The analysis showed that the proposed solutions demonstrate greater accuracy, especially under loadings with a high degree of non-proportional loads.

Kurzfassung

Für den vorliegenden Beitrag wurde die Ermüdungsgrenze unter nicht-proportionalen Beanspruchungen berechnet, in dem eine Modifikation des Huber-von Mises-Hencky Kriteriums propagiert wurde, d.h. die Novoshilov Interpretation dieses Kriteriums wurde angewendet. Als eine effective Amplitude wurde der maximale Wert der Schubspannung im jeweiligen nicht-proportionalen Beanspruchungszyklus angenommen. Er wurde außerdem die Gewichtungsfunktion postuliert, die den Richtungen leichter Gleitung im Netzwerk A2 Präferenz gibt. Anschließend wurden Verifikationsrechnungen für die entsprechenden Literaturangaben durchgeführt. Die Daten enthielten experimentell ermittelte Ermüdungsgrenzen unter zweiachsiger Beanspruchung, die sinusförmig von der Phasenverschiebung variiert wurden. Die aktuellen Ergebnisse wurden mit dem Huber-von Mises-Hencky Kriterium verglichen. Die Analyse zeigte, dass die propagierten Lösungen eine größere Akkuranz aufwiesen, insbesondere unter Gesamtbeanspruchungen mit einem hohen Anteil nicht-proportionaler Beanspruchungen.

Extended version of the contribution for the Symposium on Fatigue Failure and Fracture Mechanics

PhD. DSc. Dariusz Skibicki, born in 1967, obtained his basic education in the area of mechanical engineering at the University of Technology and Life Sciences in Bydgoszcz (Poland) in 1992. He started work on multiaxial fatigue of materials and in 2000 defended his Ph.D. After receiving the doctorate degree, his scope of interest has been enlarged by encompassing the fatigue of materials with problems of defining loading non-proportionality measures. In 2009 he received his D.Sc. degree (Habilitation). Now he is associate professor at the University of Technology and Life Science, Bydgoszcz, where in the range of education he deals with CAD/CAE problems.

References

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Published Online: 2013-05-28

Published in Print: 2011-06-01

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https://doi.org/10.3139/120.110232