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Numerical and Experimental Analysis of Crack Closure

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Abstract:

The fatigue life of metallic materials is strongly influenced by crack closure effects. Finite element (FE) methods allow the study of crack closure with great detail and can provide valuable information about phenomena occurring in the bulk of the material. In this work the distribution of stresses through the thickness of a cracked specimen has been studied using 3D FE simulations. It was found that the transition between the interior of the specimen (plane strain) and the surface (plane stress) differs from that predicted by 2D plane stress models. In addition, an attempt is presented to experimentally validate the results at the surface level. For this purpose full-field image correlation technique was utilized. This allowed direct comparison between the displacement field predicted by the numerical simulations and the experimental results measured by digital image correlation.

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Periodical:

Key Engineering Materials (Volumes 385-387)

Pages:

369-372

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.385-387.369

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Cite this paper

Online since:

July 2008

Authors:

Pablo Lopez-Crespo, Daniel Camas, Antonio González-Herrera, J.R. Yates, Eann A Patterson, Jose Zapatero

Keywords:

Crack Closure, Digital Image Correlation (DIC), Finite Element Model (FEM)

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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References

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