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Elastic-Plastic FEM Modelling of the Single Overload Effect on the Fatigue Crack Front Shape

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Abstract:

A 3D elastic-plastic FEM model for prediction of planar fatigue crack growth is presented. The model is based on the concept of local low-cycle fatigue of a small material volume in front of a high cycle crack. A local crack front advance is modelled by the successive release of finite element mesh nodes in the plane of propagation. The release of the nodes is controlled by the value of the Smith-Watson-Topper fatigue damage parameter in the surrounding elements. The effect of the single tensile overload on the fatigue crack growth and on the fatigue crack front shape is modelled.

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Periodical:

Key Engineering Materials (Volumes 488-489)

Pages:

589-592

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.488-489.589

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Online since:

September 2011

Authors:

Aleš Materna, Vladislav Oliva

Keywords:

Fatigue Crack Growth (FCG), FEM Model, Low Cycle Fatigue, Node Release Schema, Single Overload, Smith-Watson-Topper (SWT) Parameter

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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References

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