Contact Pressure and Sliding Velocity Maps of the Friction, Wear and Emission from a Low-Metallic/Cast-Iron Disc Brake Contact Pair

Abstract

A B S T R A C T

A Comparison of Airborne Particles Generated from Disk Brake Contacts: Induction Versus Frictional Heating

“…As a major source of non-exhaust emissions, brake particulate matter depends on the characteristics of the friction pair and brake parameters like speed, load and temperature. Wahlström et al [6,7] studied the airborne particles with a pin-on-disk machine working at different loads. The concentration of ultrafine/fine particles increased dramatically at the highest load levels.…”

“…Unlike speed and load, temperature is a passive parameter affected by all brake conditions [8], which means that any modification in brake parameters will lead to a change in temperature. In order to decouple temperature into an independent parameter, a new way to simulate the temperature change in friction Wahlström et al [6] Around 200 °C pin LM Pin-on-disk Wahlström et al [7] Around 200 °C disk LM Pin-on-disk Alemani et al [8] 170-190 °C disk LM Pin-on-disk Nosko et al [20] 120 °C disk LM & NAO Pin-on-disk Zum Hagen et al [9] 140-170 °C disk LM Dyno Kukutschová et al [21] Around 300 °C disk LM Dyno Perricone et al [11] Around 200 °C disk LM Dyno Mathissen et al [10] 160 °C disk LM Dyno & Road tests is required. This study proposes a heating test using a heater for temperature control to find out if airborne particles (non-friction) can be generated by heating the friction pair without sliding.…”

An FEA approach to simulate disc brake wear and airborne particle emissions

“…The methodology presented by Wahlström et al [18] is further developed in the present work to include wear and emission pv-maps. To summarize, first the specific wear rate and particle rate are mapped with respect to different contact pressures (p) and sliding speeds (v) by experiments conducted in a pin-on-disc tribometer on material level [10]. These maps are then used as input to an FEA on component level.…”

“…Refs. [6][7][8][9][10][11][12]). In turn, the wear affects the surface geometries of both the pads and rotor and therefore the contact pressure and temperature distributions.…”

“…The aim of the present study is to further develop the FEA approach [18] to include the wear and emission dependences of local contact pressure and sliding speed to simulate the macroscopic wear and airborne emissions. This is done by implementing wear and emission pvmaps obtained by pin-on-disc tribometer tests [10] in the FEA approach. In order to investigate the validity of the approach a simulation is run with the same running conditions as a dyno bench test.…”