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Contact fatigue, wear predict

This project was funded by Moravian Silesian region government and Bonatrans Group a.s.

Main topic of this project is research of wear and fatigue during rolling contact with slip applied for rail wheels. This project has two parts: Experimental focused on design and implementation of comparative test for the research of contact fatigue following AAR M-170 directive and numerical described in the following text.

Development of mathematical model for wear prediction

The rail wheel during service life experiences both cyclic plastic deformations and wear as well. This leads to change of its shape. The objective of this project was to develop algorithm for wear prediction. This algorithm could be used by engineers and designers to predict wear of rail wheels during their service life. The developed algorithm is based on Mazzu and Chaboche models. Its advantage is a very short computational time.

FEM analysis of fatigue tests

Complex behavior of rail wheels undergoing cyclic loading was studied using experimental techniques and phenological modeling. Both techniques were used for proportional and non-proportional loading. FEM was used for simulation of those tests.

Application of classic and advanced models of cyclic plasticity

Classical models such as Besseling, Mroz, Armstrong-Frederick or Chaboche implemented in commercial FEM packages could not describe correctly the complex behavior of metals during cyclic non-proportional loading. Modified AbdelKarim-Ohno model with very good prediction of ratcheting was applied for the modeling of rail wheels behavior in this project.

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