SAE J160:2001 pdf download

SAE J160:2001 pdf download Dimensional Stability of Friction Materials When Exposed to Elevated Temperatures
Scope-This performance standard specifies a universal method of measuring the dimensional change of friction materials to determine the effects of temperature.
The test applies to both disc and drum type linings commonly used in automotive and truck type brakingsystems.
Purpose—The purpose of this test procedure shall be to establish a common laboratory test method fordetermining the dimensional stability of friction materials when exposed to elevated thermal conditions. Theintent of this procedure is to characterize material swell and growth.
2.References
2.1 Related Publications—The following publications are for information purposes only and are not a required part of this document.
2.1.1 ISO PUBLICATION—Available from 25 West 43rd Street, 4th Floor,New York,NY 10036.
ISO 6313—Road vehicles—Brake linings—Effectives of heat on dimensions and form of disc brake pads—Test procedure
2.1.2 JIS PUBLICATION—Available from Japanese Standards Association，4-1-24，Akasaka，Minato-ku，Tokyo,JAPAN,107.
JlS D4416—Test Procedure of Thermal Expansion for Brake Linings and Pads of Automobiles
3. Definitions—Two test procedures are described. Method A, which simulates the Friction Material in contact with a heated rubbing surface, is preferred as it provides higher accuracy. Method B, which uses an oven to heat the freestanding material, is an approximate procedure requiring less instrumentation and is not recommended for qualification testing.
3.1 Growth—The permanent change of the outer dimensions of a friction material test sample when returned to ambient conditions after exposure to an elevated temperature.
3.2 Swell—The change in the dimensions of a friction material test sample due to exposure to elevated temperatures.
4. Symbols—See Table 1 .
5.Test Method A – Hot Plate Method Technique – Preferred
5.1 Equipment—(See Figure 1) – The test equipment is comprised of the following primary elements.
5.1.1 BASE AND FxTUREs—Includes fixtures to match the sample under test and to resist apply forces without deformation.
5.1.2 HEATING PLATEN—An electrically heated steel plate with facilities to mount fixtures to emulate the rubbing surface for each test sample
5.1.3 MECHANICAL LOADNG SYSTEM—A mechanism capable of maintaining a normal load to the test sample equivalent to 50 kPa ± 30 kPa (7.25 Ib/in2± 4.35 Ib/in2) over the sample surface area.
5.2Measurement Systems
5.2.1DISPLACEMENT MEASUREMENT SYSTEM—Capable of measuring the dynamic change in sample thickness with accuracy of 0.001 mm (0.00004 in) throughout the displacement range.
5.2.2 CONTROL AND DATAGATHERNG SYSTEM—Enables temperatures to be controlled and monitored with accuracy of 1 C (2 °F) throughout the temperature range.
5.2.3 DATA RECORDING SYSTEM—Monitors and records pertinent test results and enables the plotting of sample temperature versus sample thickness.
5.3Sample Preparation—Test specimens shall be prepared in accordance with each specific brake type.
5.3.1Disc PADs—The entire disc pad assembly with or without shoe flats and damper, or a sample of the disc pad shall be used that meets the maximum size limitations of the machine.
5.3.2 TRUcK BLocKs—Prepare a test sample of 80 mm x 80 mm(3.2 in × 3.2 in) from the thicker end of the block.