Effect of Change of Contact Ratio on Contact Fatigue Stress of Spur Gears
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Date
2013-02
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Addis Ababa University
Abstract
The present research work dealt on the effect of change of contact ratio on the contact fatigue stresses
generated on meshing spur gear teeth during power transmission. In the study different cases of six
contact ratio gearing between 1.6 and 2.0 have been analyzed. For the different contact ratios
considered the rate of load sharing and angular and radial position of load were determined on the
involute profile of meshing tooth of each gearing. In addition to that the different stress conditions of this
tooth for critical position (at the instant when the generated contact stress is at the maximum state) are
determined. To come up at the result CATIA and Solid Works software involute spur gear models have
been applied for stress analysis on ANSYS Workbench (FEM). From this study it is clear that, the higher
contact ratio resulted in the higher generated tooth fatigue contact stresses life (i.e. the highest load
carrying capacity). This is because of the decrease in value, and the change in location and direction of
load applied on tooth involute in mesh to transmit power. At last the results obtained from ANSYS WB are
compared with results of the AGMA gear formula results. They are comparable to each other.
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Mechanical Design Stream