Tribological characterization on friction brake in continuous braking

Abstract

Purpose The purpose of this study is to establish an effective method for characterizing the tribological properties of friction brakes during continuous braking because they have direct influences on the reliable operation of transport vehicles and industrial equipments. Design/methodology/approach First, tribological tests were carried out with the X-DM type friction tester, and changing curves of friction coefficient and temperature were obtained. Second, a novel tribological characteristic parameter set characterizing the tribological properties of brake pair in continuous braking was extracted from some important experimental data such as friction coefficient, wear rate and temperature. Finally, the influence of law and mechanism of braking number on dynamic tribological parameters was studied through continuous braking experiments. Findings The extracted tribological characteristic parameter set includes two subsets: dynamic characteristic parameter subset and overall characteristic parameter subset, which is composed of ten parameters: dynamic parameters of friction coefficient (including average, trend coefficient and stability coefficient), dynamic wear rate, dynamic average temperature, dynamic temperature rise, overall average friction coefficient, overall wear rate, overall average temperature and overall temperature rise. Originality/value Conclusively, the novel tribological characteristic parameter set is more comprehensive and objective, and it can provide a theoretical basis for the study of tribological properties in continuous braking.

Study on the Temperature Rise Characteristics of Successive Clutch Shifting Considering the Disengaged Friction Pair Gaps

“…Grzes [17] established a computational finite element model to investigate the temperature rise distribution of the brake disc during repetitive brake application. Bao et al [18] conducted twenty-five consecutive braking tests of a friction brake, suggesting that the maximum temperature remained at a relatively stable value during the last few braking actions; moreover, the same experimental phenomenon was shown by Yanar et al [19]. Pisaturo et al [20] proposed a finite element model to predict the critical temperature of a dry clutch during the repeated engagement.…”

“…Grzes [17] established a element model to investigate the temperature rise distribution of repetitive brake application. Bao et al [18] conducted twenty-five tests of a friction brake, suggesting that the maximum temperatur tively stable value during the last few braking actions; moreover, t phenomenon was shown by Yanar et al [19]. Pisaturo et al [20] pro model to predict the critical temperature of a dry clutch during the r However, for the wet multi-disc clutch, there are few studies on Due to the specific working mode of the wet clutch, large amounts of friction heat are inevitably generated during the short engaging process, thus causing a considerable and uneven temperature rise.…”

Tribological behavior and wear mechanism of C/C–SiC brake discs based on third‐body layer

“…With the continuous updating of the walking and power transmission systems of vehicles, the speed, combat weight, and ton power of vehicles have significantly improved. 1 However, the high mobility, high power density, and complex service environment lead to various problems related to sudden changes in the coefficient of friction (COF), ablative locking, and severe wear of traditional powder metallurgy brake discs during high-temperature braking. 2,3 Recently, C/C-SiC composites have attracted increasing attention because of their low density, high strength, good fatigue resistance, and stable high-temperature friction and wear properties.…”

Investigation on tribological and corrosion characteristics of oxide-coated steel and mild steel fiber-based brake friction composites

“…Though the material selection plays a vital role other than that the test conditions and environmental aspects to play a vital role (Yin et al , 2016). Thus, it becomes mandatory to monitor the tribological performance of the friction materials in versatile conditions preferably in continuous braking conditions (Yin et al , 2014; Bao et al , 2018). Generally, friction material formulation is an amalgamation of 10-15 ingredients that are four classifications in four major categories namely binder, filler (inert and functional), fibers and friction modifiers (lubricants and abrasives).…”