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A Comparison by Thermal Analysis of Rotor Alloys for Automobile Disc Brakes
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1970 by SAE International in United States
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The effect of rotor alloy composition on thermal conditions in a disc brake system was determined analytically. The three alloys selected were gray cast iron, 356 aluminum, and copper -1% chromium. This study includes calculations of the temperature and heat storage in the various portions of the brake system, as well as the variations of convective heat transfer throughout the system. These computations were made for the transient conditions existing during a series of 60 mph stops (15 ft/sec2 deceleration). The steady-state rotor surface temperature and the thermal gradients were found to decrease with increasing thermal conductivity of the alloys. The rotor surface temperatures for the first two stops were relatively independent of thermal conductivity, but were strongly dependent on heat capacity. Convection was found to occur almost entirely (greater than 90%) from the rotor surface and ventilating passages.
CitationRusnak, R., Schwartz, H., and Coleman, W., "A Comparison by Thermal Analysis of Rotor Alloys for Automobile Disc Brakes," SAE Technical Paper 700137, 1970, https://doi.org/10.4271/700137.
- Rhee S. K. Rusnak R. M. Spurgeon W. M. “A Comparative Study of Four Alloys for Automotive Brake Drums.” Paper 690443 presented at SAE Mid-Year Meeting Chicago May 1969
- Rhee S. K. Spurgeon W. M. Turak J. L. “An Inertial Dynamometer Evaluation of Three Alloys for Automotive Brake Drums.” Paper 700138 presented at SAE Automotive Engineering Congress Detroit January 1970
- Noyes R. N. Vickers P. T. “Disc Brakes, Where Does the Heat Go?” Paper 690457 presented at SAE Mid-Year Meeting Chicago May 1969