Thermoelastic instability (TEI) results in uneven heating of the rotor and the development of hot spots in automotive disk brake systems. The hot spots cause rotor distortion and thickness variation which can cause torque variation resulting in brake roughness or low frequency noise. Lee and Barber (1993, ASME J. Tribol., 115, pp. 607–614) developed an analytical model to predict the critical speed above which TEI would occur. This paper describes enhancements to the model to include the effects of caliper/pad stiffness, the pad friction material thickness, and the pad length. The effects of these changes on the predicted speed are calculated and compared to the original model. [S0742-4787(00)01402-8]
Issue Section:
Technical Papers
1.
Lee
, K.
, and Barber
, J. R.
, 1993
, “Frictionally Excited Thermoelastic Instability in Automotive Disk Brakes
,” ASME J. Tribol.
115
, pp. 607
–614
.2.
Dow
, T. A.
, and Burton
, R. A.
, 1972
, “Thermoelastic Instability of Sliding Contact in the Absence of Wear
,” Wear
19
, pp. 315
–328
.3.
Burton
, R. A.
, Nerlikar
, V.
, and Kilaparti
, S. R.
, 1973
, “Thermoelastic Instability in a Seal-Like Configuration
,” Wear
24
, pp. 177
–188
.4.
Barber
, J. R.
, 1967
, “The Influence of Thermal Expansion on the Friction and Wear Process
,” Wear
10
, pp. 155
–159
.5.
Barber
, J. R.
, 1969
, “Thermoelastic Instabilities in the Sliding of Conforming Solids
,” Proc. R. Soc. London, Ser. A
312
, pp. 381
–394
.6.
Van Swaaij, J. L., 1979, “Thermal Damage to Railway Wheels,” Inst. Mech. Eng., Intl. Mech. Eng., Intl. Conf. on Railway Braking, York, p. 95.
7.
Hewitt, G. G., and Musial, C., 1979, “The Search for Improved Wheel Materials,” Inst. Mech. Eng., Intl. Conf. on Railway Braking, York, p. 101.
8.
Kreitlow, W., Schrodter, F., and Matthai, H., 1985, “Vibration and Hum of Disc Brakes Under Load,” SAE 850079.
9.
Abendroth, H., 1985, “A New Approach to Brake Testing,” SAE 850080.
10.
Anderson
, A. E.
, and Knapp
, R. A.
, 1989
, “Hot Spotting in Automotive Friction Systems
,” Int. Conf. Wear Materials
, 2
, pp. 673
–680
.11.
Thomas, E., 1988, “Disc Brakes for Heavy Vehicles,” Inst. Mech. Eng., Intl. Conf. on Disc Brakes for Commercial Vehicles, C464/88, pp. 133–137.
12.
Barber
, J. R.
, Beamond
, T. W.
, Waring
, J. R.
, and Pritchard
, C.
, 1985
, “Implications of Thermoelastic Instability for the Design of Brakes
,” ASME J. Tribol.
107
, pp. 206
–210
.13.
Ayala
, J. R. R.
, Lee
, K.
, Rahman
, M.
, Barber
, J. R.
, 1996
, “Effect of Intermittent Contact on the Stability of Thermoelastic Sliding contact
,” ASME J. Tribol.
118
, pp. 102
–108
.14.
Lee, K., and Dinwiddie, R. B., 1998 “Conditions of Frictional Contact in Disk Brakes and Their Effects on Brake Judder,” SAE980598.
15.
Lee, K., and Barber, J. R., 1995, “Effect of Intermittent Contact on the Thermoelastic Instability of Automotive Disk Brake Systems,” AMD-198, Thermoelastic Problems and The Thermodynamics of Continua, ASME.
16.
Barber, J. R., 1992, Elasticity, Kluwer Academic Publishers, MA, pp. 199–203.
17.
Barber, J. R., 1997, personal communication.
18.
Hecht, R. L., 1996, “Thermal Transport Properties of Gray Cast Iron Rotors,” SRM-96-013, Sept. 5.
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