TY - JOUR
T1 - The effect of material properties on the thermoelastic stability of sliding systems
AU - Decuzzi, P.
AU - Demelio, G.
N1 - Funding Information:
The authors wish to thank S.L. Campanelli for helping in running the similar material case calculations. P. Decuzzi acknowledges the Politecnico di Bari for financial support (Borsa Breve Post-Lauream del Politecnico di Bari).
PY - 2002/2
Y1 - 2002/2
N2 - Frictionally excited thermoelastic instability (TEI) results in severe thermomechanical damage of clutches and brakes leading to localized surface burning of frictional materials, permanent distortions of metal plates, vibrations and noise. In this work, the analytical formulation proposed in [ASME J. Tribol. (2001)], rephrased in dimensionless form, is employed to estimate the influence of the material properties on the minimum critical speed of sliding systems. Two cases of practical interest are considered, an automotive multidisk clutch (dissimilar materials case) and a carbon-carbon brake/clutch for high speed applications (similar materials case). In both cases the relative importance in altering the minimum critical speed and the direction of change of each parameter is examined and a comparison with previous available solutions is performed. A simple and sufficiently accurate relation is found to hold between the sliding V or rotating Ω critical speed and the arbitrary material parameter ξ. Vmin = Ωmin = (ξ)n Vo Ω0 ξo which can be employed in estimating the optimum set of material properties for sliding systems. Typical sliding and rotating critical speeds are also given for automotive, railway and aeronautical applications, regarding both brakes and clutches.
AB - Frictionally excited thermoelastic instability (TEI) results in severe thermomechanical damage of clutches and brakes leading to localized surface burning of frictional materials, permanent distortions of metal plates, vibrations and noise. In this work, the analytical formulation proposed in [ASME J. Tribol. (2001)], rephrased in dimensionless form, is employed to estimate the influence of the material properties on the minimum critical speed of sliding systems. Two cases of practical interest are considered, an automotive multidisk clutch (dissimilar materials case) and a carbon-carbon brake/clutch for high speed applications (similar materials case). In both cases the relative importance in altering the minimum critical speed and the direction of change of each parameter is examined and a comparison with previous available solutions is performed. A simple and sufficiently accurate relation is found to hold between the sliding V or rotating Ω critical speed and the arbitrary material parameter ξ. Vmin = Ωmin = (ξ)n Vo Ω0 ξo which can be employed in estimating the optimum set of material properties for sliding systems. Typical sliding and rotating critical speeds are also given for automotive, railway and aeronautical applications, regarding both brakes and clutches.
KW - Carbon-carbon brakes
KW - Hot spotting
KW - Thermoelastic instability
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U2 - 10.1016/S0043-1648(01)00886-9
DO - 10.1016/S0043-1648(01)00886-9
M3 - Article
AN - SCOPUS:0036474225
SN - 0043-1648
VL - 252
SP - 311
EP - 321
JO - Wear
JF - Wear
IS - 3-4
ER -