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A Mechanism-Based Model for LCF/HCF and TMF/HCF Life Prediction: Multiaxial Formulation, Finite-Element Implementation and Applicationto Cast Iron

  • In this paper, the multiaxial formulation of a mechanism-based model for fatigue life prediction is presented whichcan be applied to low-cycle fatigue (LCF) and thermomechanical fatigue (TMF) problems in which high-cycle fa-tigue loadings are superimposed. The model assumes that crack growth is the lifetime limiting mechanism and thatthe crack advance in a loading cycleda/dNcorrelates with theIn this paper, the multiaxial formulation of a mechanism-based model for fatigue life prediction is presented whichcan be applied to low-cycle fatigue (LCF) and thermomechanical fatigue (TMF) problems in which high-cycle fa-tigue loadings are superimposed. The model assumes that crack growth is the lifetime limiting mechanism and thatthe crack advance in a loading cycleda/dNcorrelates with the cyclic crack-tip opening displacement ΔCTOD.The multiaxial formulation makes use of fracture mechanics solutions and thus, does not need additional modelparameters quantifying the effect of the multiaxiality. Furthermore, the model includes contributions of HCF on ΔCTODand assesses the effect of the direction of the HCF loadings with respect to LCF or TMF loadings inthe life prediction. The model is implemented into the finite-element program ABAQUS. It is applied to predictthe fatigue life of a thermomechanically loaded notched specimen that should represent the situation between theinlet and outlet bore holes of cylinder heads. A good correlation of the predicted and the measured fatigue lives isobtained.show moreshow less

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Metadaten
Author:Mario Metzger, Thomas SeifertGND
Contributing Corporation:Magdeburger Verein für Technische Mechanik e.V.
Place of publication:Magdeburg
Year of Publication:2012
Language:English
GND Keyword:Ermüdung; Finite-Elemente-Methode; Gusseisen
Parent Title (English):TECHNISCHE MECHANIK
Volume:32
Issue:2-5
ISSN:0232-3869
First Page:435
Last Page:445
Document Type:Article (reviewed)
Institutes:Hochschule Offenburg / Bibliografie
Acces Right:Frei zugänglich
Release Date:2019/10/24
Licence (German):License LogoEs gilt das UrhG
URN:urn:nbn:de:0011-n-2364596
URL:http://www.uni-magdeburg.de/ifme/zeitschrift_tm/2012_Heft2_5/31_Metzger.pdf