ETEK Technology measures elastic constants using non-destructive ultrasound. The complexities of this technology are explained in this knowledgebase to help you understand how ETEK technology can help in the development of material formulations and quality control during the manufacture of a material. ETEK technology is used widely in the automotive industry for friction material formulations.
Brake noise, a major source of warranty costs, is a complex problem involving a myriad of design and processing variables that include friction material properties, rotor design, caliper design, and vehicle suspension. The mechanical properties of friction materials are thought to play an important role in braking system noise performance1-4. These mechanical properties can be measured by ETEK technology to aid the development of friction material formulations.
Although brake noise is minimized through proper design and appropriate friction material formulation, the realization of noise-free brakes requires that the manufacturer maintain these properties in production. Process variations can significantly alter friction material properties. This can adversely influence noise performance. Better measurement tools applied at the point of manufacture are important.
Silence is Golden: Eliminating NVH
A presentation promoting the measurement of elastic constants in brake pad friction materials.
Elastic Constant Measurement on Composites
H. M. Ledbetter and D. T. Read
A good background on composite elastic constant measurement.