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The Influence of Loading Ratio on Fatigue Crack Propagation Through a Bi-Material Interface

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Abstract:

The paper is devoted to fatigue crack propagation in layered materials. The influence of plasticity induced crack closure on threshold values for fatigue crack propagation through interfaces between different materials layers is studied. The main aim was to estimate the influence of the loading ratio R on threshold values for crack propagation through a bi-material interface as a function of the elastic mismatch of both materials. The finite element method (FEM) is used for numerical calculations. Results obtained for different loading ratios, materials, boundary conditions and magnitude of applied loading can be generalized and used for the design of composite bodies with different material layers.

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Periodical:

Key Engineering Materials (Volumes 348-349)

Pages:

317-320

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.348-349.317

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Online since:

September 2007

Authors:

Luboš Náhlík, Pavel Hutař, Zdeněk Knésl

Keywords:

Bi-Material Interfaces, Critical Stress, Loading Ratio, Plasticity-Induced Crack Closure

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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