STRESS ANALYSIS IN CERAMIC ROLLING ELEMENTS

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STRESS ANALYSIS IN CERAMIC ROLLING ELEMENTS

Journal Title: Tribologia - Year 2010, Vol 232, Issue 4

Abstract

Some ceramic materials have been found to have the optimum combination of properties that are suitable for rolling element bearing applications (high speeds, high loads, different environments). Cracks, structure defects, and manufacturing faults are the main problem connected with fatigue life. These defects decrease the rolling contact fatigue considerably. A stress analysis of crack propagation by the finite element method of silicon nitride material was described in the paper. Ring cracks were modelled based on microscopic analysis of artificial induced cracks made onto silicon nitride balls. The stress analysis of cracks was performed in relation to the contact position of two ceramic balls. Numerical stress analysis shows that the maximum value of von Mises stresses is 0.04 – 0.05 mm below the ceramic ball surface where the cracks change direction. The results are in accordance with experimental research and confirm that crack propagation takes place directly below the ball surface.<br/><br/>

Authors and Affiliations

Waldemar Karaszewski

Keywords

ceramic materials Fatigue life Surface defects finite element analysis

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EP ID EP517357
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