Computational service life estimation of contacting mechanical elements in regrad to pitting
Ren, Zoran ; Glodež, Srečko
A computational model for determining the service life esitmation of contacting mechanical elements in regard to pitting is presented. The model considers the material fatigue process leading to ...pitting, i.e. the conditions required for the short fatigue crack propagation originating from the initial crack in a single material grain. In view of small crack lengths observed in surface pitting, the simulation takes into account the short crack growth theory. The stress field in the contact area and the required functional relationalship between the stress intensity factor and the crack length are determined by FEM. An equivqlent model of two contacting cylinders is used for numerical simulations of crack propagationin the contact area. On the basis of numerical results, and with consideration of some particular material parameters, the probable service life period of contacting surfaces is estimated for surface curvatures and loading most commonly encountered in engineering practice.
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