Friction Material Elastic Constants Determination through FRF Measurements and Optimization
- Ground Vehicle Standard
There is no known measurement method that can measure a complete set of elastic constants of a single sample. The prevailing measurement method used in automotive brake industry is the ultrasonic method (SAE J2725), which requires measurements of TWO separate samples to calculate a set of elastic constants (while the elastic constants and densities of these two samples are generally different).
There is no known measurement method, not just for a complete set of elastic constants but also densities, that is nondestructive.
Measuring multiple samples from multiple pads then calculating their averages, while beneficial, does not ensure adequate correlation (pad assembly vibration simulation vs. measurement) – see referenced publications. Besides, the averaged values are no longer “local” properties, anyway.
Data Sets - Support Documents
|Unnamed Dataset 1|
|TABLE 1||LINING ANISOTROPIC MATERIAL PROPERTIES|
|TABLE 2||PRESSURE PLATE MATERIAL PROPERTIES|
|TABLE 3||FRF MEASUREMENT INFORMATION SUMMARY|
|TABLE 4||GENERAL RANGES OF ELASTIC CONSTANTS OF NAO FRICTION MATERIALS (FOR REFERENCE ONLY)|
|TABLE 5||GENERAL RANGES OF ELASTIC CONSTANTS OF LOW-MET FRICTION MATERIALS (FOR REFERENCE ONLY)|
|TABLE 6||GENERAL RANGES OF ELASTIC CONSTANTS OF SEMI-MET FRICTION MATERIALS (FOR REFERENCE ONLY)|
The Brake NVH Standards Committee of the Foundaiton Brake Steering Committee develops and reviews information reports, recommended practices and standards related to brake NVH testing in the laboratory and in vehicles. Included are passenger car and light truck transportation.