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Evaluation of Gray Iron Brake Discs for Trucks By Thermal Modeling
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1975 by SAE International in United States
Annotation ability available
Lower temperatures at the sliding interface of a disc brake will reduce thermal wear and fade tendencies of friction materials. One method for achieving these lower temperatures is to improve the thermal design of gray cast iron discs.
The purpose of this investigation was to study design improvements of brake discs for trucks. To accomplish this objective, an analytical thermal model was developed. The model employed the lumped parameter approach, in which the disc was subdivided into a number of small volumes. The model specifically simulated disc temperature response during 80.5 km/h (50 mph) fade tests performed on a dynamometer. The thermal model was correlated with test data to verify and improve its accuracy, and then utilized to evaluate effects of geometry changes.
Results showed that mass concentration in the disc faces yields lower temperatures at the friction interface through 10 successive snubs. Even after a very large number of snubs, temperature cycling would be less extreme with thicker faces.
The study has demonstrated that thermal modeling is a valid and potentially valuable tool in the design optimization of brake discs. Indeed, the analytical approach, combining both thermal and stress analyses, along with prototype testing, may prove the most effective method for future design development of disc brakes.
CitationSchwartz, H., Hartter, L., Rhee, S., and Byers, J., "Evaluation of Gray Iron Brake Discs for Trucks By Thermal Modeling," SAE Technical Paper 751013, 1975, https://doi.org/10.4271/751013.
- Hartter, L. L. Schwartz H. W. Rhee S. K. “Evaluating Copper Alloy Brake Discs by Thermal Modeling,” SAE Paper 740560
- Kreith F. Principles of Heat Transfer International Textbook Company Scranton, Pennsylvania 1958 146 147
- Rusnak R. M. Schwartz H. W. Coleman W. P. “A Comparison by Thermal Analysis of Rotor Alloys for Automobile Disc Brakes,” SAE Transactions 79 1970 Paper No. 700137
- Morgan S. Dennis R.W. “A Theoretical Prediction of Disc Brake Temperatures and a Comparison with Experimental Data,” SAE Paper 720090 Automotive Engineering Congress Detroit, Michigan Jan. 10-14 1972
- Noyes R.N. Vickers P.T. “Prediction of Surface Temperatures in Passenger Car Disc Brakes,” SAE Transactions 78 1969 Paper 690457
- Dusinberre G.M. Heat-Transfer Calculations by Finite Differences International Text Book Company Scranton, Pa.
- MITAS-CDC Thermal Analyzer User Information Manual Cybernet Service, Control Data Corporation 1972
- Walton C.F. The Gray Iron Castings Handbook Gray Iron Founders' Society Ind. Cleveland, Ohio 1958 194
- Walton C.F. Gray and Ductile Iron Castings Handbook Gray and Ductile Iron Founders' Society Inc. Cleveland, Ohio 1971 298
- Dennis R.W. Newstead C. Edge A.J. “The Heat Transfer from a Rotating Disc in an Air Crossflow” Proceedings of the 4th International Heat Transfer Conference Paris, France FC7.1 Sept. 1970
- Kayes W.M. Bjorklund I.S. “Heat Transfer from a Rotating Cylinder With and Without Crossflow” Transactions of the ASME January 1958 70 78
- McAdams W.H. Heat Transmission Third McGray-Hill Book Co., Inc. New York 1954 180
- Kreith F. Principles of Heat Transfer 296
- Kayes W.M. Convective Heat Mass Transfer McGraw-Hill Book Company, Inc. New York 256 269