DURABILITY AND WEAR ANALYSIS OF NON-ASBESTOS MOLDED LINERS BRAKE PADS UNDER DRY / MOIST CONDITIONS BY USE OF LAB ABRASIVE TEST METHOD .

Mechanical engineering

Disk brakes are in common use in automobiles like bikes , Cars , buses , trucks etc . Various research work has been previously done on the material of disk brake but the brake calliper friction material is of equal importance as it takes part in the braking action . Brake materials have been studied so far as to determine the coefficient of friction , temperature analysis etc , but abrasion behaviour of these materials has been seldom studied . Abrasion behaviour with a rotating wheel-type apparatus has been examined with angular sand (silica) abrasives as a function of test conditions, namely wheel-type _rubber wheel or steel wheel. and environment _dry or wet conditions.. Water tends to lubricate the contact between the particles and the testpiece, especially with small andor rounded particles and thus the wear rate is reduced. With larger particles, the presence of water still affects wear, in that two-body abrasion may be favoured, cutting enhanced and particle embedment reduced. The steel wheel tends to produce more fragmentation of abrasives, but in the wet environment, this is reduced as the lubricated contact with the testpiece results in lower stresses in the particles. The role of water has been shown to be significant in both the rubber and steel wheel tests and affects particle motion and particle fragmentation _depending on particle type, shape and size. and, thus, has a strong effect on wear rates and mechanisms observed. The conditions employed in a test used to simulate service conditions must be carefully chosen so as to mimic the latter conditions as closely as possible and the environment _wet or dry. is a significant parameter that must be considered.

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