SEDL / STP / STP1231-EB / STP13960S

Neuber-Based Life Prediction Procedure for Multiaxially Loaded Components

Hanschmann, D
Supervisor, Porsche AG, Research & Development Center, Weissach,

Maldfeld, E
Researcher and professor, University of Duisburg, Duisburg,

Nowack, H
Researcher and professor, University of Duisburg, Duisburg,

Pages: 17    Published: Jan 1994

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Abstract

The development of crack initiation life prediction methods for multiaxially loaded components is still at an early stage. In the present paper, a life prediction procedure that combines the finite element method (FEM) and the convenient notch analysis is presented. Transfer factors as derived by elastic FEM are used to calculate the multiaxial stress components at fatigue critical locations. From the individual stress components equivalent stresses are derived by a hypothesis that is based on the normal stress hypothesis and specially extended to treat multiaxial fatigue problems. A special algorithm is presented for the evaluation of equivalent stresses for multiaxial stress components with different frequencies and amplitudes. The continuous sequence of equivalent stress values is then used as an input to the Neuber-based notch analysis where the stress concentration factor is set equal to 1.