Non-Newtonian Thermo-Viscoelastic EHD Traction from Combined Slip and Spin

Abstract

Shear heating has been incorporated into a viscoelastic model of traction by a simple iterative method. The computed traction now exhibits a maximum with increasing slip as observed experimentally.

Computed and measured results (without spin) agree well, except at very low slip and at the higher of two temperatures. There are indications that this could be corrected and that more realistic values of lubricant shear modulus could be used if roller compliance was included in the model. Values of pressure viscosity coefficient and of thermal conductivity required for fit of traction-slip curves are in reasonable agreement with independent measurements; Newtonian limit stress is assumed to be independent of pressure and proportional to absolute temperature in accordance with rate theory.

With spin present, the computed traction is up to 15 percent larger than measured. Computed trends with changing load, speed and temperature are approximately correct. The model should be useful in its present form for preliminary design of traction drives.

Roller compliance has negligible effect on the with-spin traction.

Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Minneapolis, Minnesota, October 24–26, 1978

Notes

Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Minneapolis, Minnesota, October 24–26, 1978