SAE J160 pdf download

SAE J160 pdf download.(R) Dimensional Stability of Friction Materials When Exposed to Elevated Temperatures.
1. This performance standard specifies a universal method of measuring the dimensional change of triction materials to determine the effects of temperature.
The test applies to both disc and drum type linings commonly used in automotive and truck type baking systems.
1.1 Purpose—The purpose of this test procedure shall be to establish a common laboratory test method for determining the dimensional stabhity of friction materials when exposed to elevated thermal conditions. The intent of ttiis 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 mensions and form of disc brake pads—Test procedure
2.1.2 JIS PuBucAnot.—Available from Japanese Standards Association, 4-1-24. Akasaka, Minato-ku. Tokyo, JAPAN. 107.
JIS D 4416—Test Procedure of Thermal Expansion for Brake Linings and Pads of Automobiles
5,8.3.7 The maximum swell and report the lime and temperature at which it occurred.
5.8.3.8 Maximum temperature reached.
5.8.3.9 Swell at highest temperature for the first and the second test penod
5.8.3.10 Appearance of the lnction material after the test, noting especially any formation of blisters, cracks and bubbles, peeling or chipping of friction material and detachment from the backing plate.
6. Test Method B- Oven Technique — Oven Method — Approximate
6.1 Scope—These tests are designed to provide an estimate of dimensional changes at elevated temperature with minimal time and investment.
6.2 Equipment—Conventional oven with capacity to maintain temperature of 200 °C ± 5 °C (392 °F ± 9 °F).
6.3 Swell and Growth
6.3.1 Obtain initial room temperature thickness reacngs to the nearest 0.025 mm (0.001 in), measuring the specimen at not less than six points located approximately 0.5 In — 0.8 in in from the lining edge.
6.3.2 Place the unconfined specimen in an oven at room temperature. Increase oven temperature to 200 °C ±
5°C (392 °F ± 9 °F). Rise time to. 200 °C ± 5 °C (392 °F ± 9 F) shall be 1/2 to 1 h. Allow specimen to remain in oven lot 30 to 45 mm at 200 °C ± 5 °C (392 °F ± 9 F).
6.3.3 Remove the specimen from the oven and while still hot measure thickness at the same points used for obtaining initial thickness Record the increase In thickness as swell within three minutes.
6.3.4 Allow specimen to cool completely, in still air, to room temperature and again measure thickness. Record the increase in thickness as growth.
NOTE— The dimensional stability test may be periormed at the same time and on the same specimen as the swell and growth test, if desired.
6.4 DimensIonal Stability Test Procedure
6.4.1 Place the specimen, at room temperature, on a piece of paper and trace its outline. Record the outside arc length of the specimen.
6,4.2 Place the uncontined specimen, on one of its arcuate edges In oven at room temperature. Increase oven temperature to 200 °C ± 5 °C (392 °F ± 9 F). Rise time to 200 C ± 5 °C (392 °F ± 9 °F) shall be 30 to 60miri. A specimen is to remain in oven for 30 to 40 mm at 200 °C ± 5 °C (392 °F ± 9 F).
6.4.3 Allow the specimen to cool completely, in still air, to room temperature and again place it on the paper so that the center of the specimen coincides with that of the original trace at the center and shows approximately equal deviation from the original trace at each end. Again trace specimen outline and compare it to the original.
6.5 Procedural Notes
6.5.1 Blisters and surface abnormalities at measured reference points shall be recorded.
6.5.2 Care should be taken that transfer of material to the holding or measuring devices does not affect the accuracy of the measurements.