Modeling of the surface film influence on thermoelastic instability during friction of composite brake discs

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Abstract

The paper examines the process of thermoelastic instability occurrence during unsteady friction of anisotropic disk samples in the presence of a third body film on the friction surface. This process takes place during the operation of highly loaded braking systems (in aviation and railway transport), specialized clutches of motor vehicles and in other mechanisms. The presence of surface film leads to a decrease in surface wear simultaneously with the emergence of significant nonlinearity in the wear rate. The finite difference method was used to simulate the mutual influence of wear, frictional heating, elastic deformations and the evolution of the film on the friction surface. The process of friction and wear of discs was studied taking into account the history of a series of braking events. The annular shape of surface pressures and temperatures distribution is considered. A comparison was made of the evolution of disc wear from braking to braking for the cases of the film presence, its absence, and experimentally measured wear.

About the authors

A. G. Shpenev

Ishlinsky Institute for Problems in Mechanics RAS

Author for correspondence.
Email: kel-a-kris@list.ru
Russian Federation, Moscow

References

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Supplementary files

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2. Fig. 1. Contact diagram of a pair of disks

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3. Fig. 2. Dependence of contact pressures p(r, t) (MPa) on the radial coordinate r (mm) and the time coordinate t (s) for the first (left) and second (right) successive braking, taking into account the presence of a surface film

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4. Fig. 3. Dependence of contact temperatures on the friction surface T(r,0,t) (C) on the radial coordinate r (mm) and the time coordinate t (s) for the first (left) and second (right) successive braking, taking into account the presence of a surface film

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5. Fig. 4. Dependence of contact pressures p(r, t) (MPa) on the radial coordinate r (mm) and the time coordinate t (s) for the first (left) and second (right) successive braking without taking into account the presence of a surface film

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6. Fig. 5. Dependence of contact temperatures on the friction surface T(r,0,t) (°C) on the radial coordinate r (mm) and the time coordinate t (s) for the first (left) and second (right) successive braking without taking into account the presence of a surface film

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7. Fig. 6. Dependence of linear wear uW (mm) on radial coordinate r (mm) (shape of worn surface) for 10 consecutive brakings taking into account the presence of a surface film. Odd brakings are highlighted with bold lines.

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8. Fig. 7. Dependence of linear wear uW (mm) on radial coordinate r (mm) (shape of worn surface) for 10 consecutive brakings without taking into account the presence of a surface film. Odd brakings are highlighted with bold lines

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9. Fig. 8. Dependence of the average linear wear for one braking UW (mm) on the braking number N for 10 consecutive brakings taking into account the presence of a film (solid line) and without taking into account the presence of a film (dashed line)

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10. Fig. 9. Dependence of the ratio of wear intensity taking into account the film to the wear intensity without taking into account the film (I = .uW / .uW*) on the geometric parameter of the contact S/L (mm)

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