On Scaled Normal Stresses in Multiaxial Fatigue and Their Exemplary Application to Ductile Cast Iron

Applied Mechanics

Christian Gaier¹  Alexander Linn²  Michael Wächter²  Ralf Wuthenow²  Alfons Esderts²  Carl Fällgren³  Michael Vormwald³  Jan Kraft³ 

[1] Engineering Center Steyr Gmbh & Co. KG, 4300 St. Valentin, Austria;Institute for Plant Engineering and Fatigue Analysis, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany;Materials Mechanics Group, Technical University of Darmstadt, 64287 Darmstadt, Germany;

关键词: multiaxial fatigue;    critical plane;    scaled normal stresses;    proportional loading;    nonproportional loading;    ductile cast iron;   

DOI  :  10.3390/applmech3010018

来源: DOAJ

【 摘 要 】

The approaches used to calculate the fatigue life of components must inevitably consider multiaxial stresses. Compared to proportional loading, the calculation of nonproportional loading is particularly challenging, especially since different materials exhibit the effects of nonproportional hardening and shifts in fatigue life. In this paper, the critical plane approach of scaled normal stresses, first proposed by Gaier and Dannbauer and later published in a modified version by Riess et al., is investigated in detail. It is shown that, on the one hand, compatibilities exist or can be established with known proportional strength criteria that can account for the varying ductility of different materials. Furthermore, it is demonstrated that the scaled normal stress approach can be formulated in such a way that different strength criteria can be used therein. As an example, the generally formulated approach for scaled normal stresses is applied to test results from ductile cast iron material EN-GJS-500-14. Different correction factors accounting for nonproportional loading are investigated. Through appropriate parameterization of one of the studied corrections, proportional and nonproportional test results were observed to fall within one common scatter band.

【 授权许可】

Unknown