engleski

Optimizing single tooth bending fatigue fixture rigidity for minimizing the effect of friction on nominal tooth root stress results

Bending fatigue in spur gears, which transpires due to cyclic and variable tooth root stresses, is one of the main reasons for gear failure. Bending fatigue can bring about crack initiation, propagation and possible complete failure of the gear tooth. To investigate and possibly prevent such occurrence, single tooth bending fatigue tests are often used to obtain statistically significant bending fatigue data at a comparatively low price. In material fatigue, relatively minor change of nominal stress results can produce significant shift in fatigue lives. Hence, to accurately interpret and apply single tooth bending fatigue results on a running gear pair, it is of great importance to properly consider the effect of friction forces on gear load capacity. In this paper, numerical investigation of tooth flank friction effect on gear load capacity during single tooth bending fatigue test is conducted. Finite element analysis, whilst considering various friction coefficients and test fixture dimensions, is carried out to obtain nominal tooth root stresses. The aim of the research is to optimize the rigidity of the experimental fixture to minimize the influence of friction forces on nominal tooth root stress results. Confirmation of the aforestated goal is insinuated by the preliminary results of the numerical investigation.

Spur Gear ; Friction Forces ; Fixture Rigidity ; Finite Element Method ; Single Tooth Bending Fatigue Test

nije evidentirano