Coefficient of friction testing

Abstract

Nowadays, the Thailand automotive industry widely grows. Brake'pad is one of the automotive productions that role to automotive industry because it is the most critical security parts. Consequently, testing products for quality are extremely requested. However, the equipment and function tests are not enough and are also high cost so it cannot supports to the automotive industry development. In this work, the initiation and design of frictional test were carried out. The testing procedure is referred to The special test jigs for friction measurements JIS K7125[5] and Clutch facings for automobiles JIS D4311[6].A study of the frictional test emphasize on the static friction(l-ls) and kinetic friction(l-lk) in different condition. There are 3 specimens of brake pad supported by the industry company. These specimens were test and compared between the pin on disk's result and the friction testing's result. The two-sided results from the analysis correspond but the pin on disk's friction coefficient is more than the friction testing's friction coefficient by 19.56%. Moreover, the coefficient of friction tends to follow the temperature. Besides, the static friction(l-ls) is likely more than kinetic friction(l-lk) and will be high difference in high pressure condition.