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Original scientific paper

https://doi.org/10.17559/TV-20140429122305

Computational fatigue analysis of contacting mechanical elements

Gorazd Fajdiga orcid id orcid.org/0000-0001-5738-7945 ; University of Ljubljana, Biotechnical Faculty, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia


Full text: croatian pdf 1.118 Kb

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Full text: english pdf 1.118 Kb

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Abstract

The paper investigates the influence of different parameters on stress distribution in the contact area of mechanical elements. The study is aimed to determine particular positions in the contacting bodies, where small crack should be initiated due to large stresses resulting from different contact conditions. A two-dimensional equivalent contact model together with Hertzian contact theory is used for all computational analyses utilising the finite element method. The distribution of the maximum equivalent von Mises stress under the contacting area is first determined for pure Hertzian contact conditions, where the maximum stresses appear at a certain depth under the contacting surface. Then a parametric study to determine the influence of loading, contact surface curvature, contact friction, residual stresses and elasto-hydro-dynamic lubrication on the stress distribution is performed. They tend to increase the stresses and move their maximum to or very close to the contacting surface, which can lead to sub-surface or surface crack initiation. In this study the surface crack initiation and propagation on the gear teeth flank is presented. The virtual crack extension (VCE) method, implemented in the finite element method, is used for simulating the fatigue crack propagation from the initial crack up to the formation of the surface pit. Comparison between the results of the numerical simulation and the results of experimental testing shows good correlation.

Keywords

contact problems; crack initiation; crack propagation; machine elements; numerical analysis; tribology

Hrčak ID:

135078

URI

https://hrcak.srce.hr/135078

Publication date:

23.2.2015.

Article data in other languages: croatian

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