Issue34

C. Baron Saiz et alii, Frattura ed Integrità Strutturale, 34 (2015) 608-621; DOI: 10.3221/IGF-ESIS.34.67 614 Figure 7 : Specific heat flux (W/mm 2 ) vs time (s) for a sector Braking forces Braking system works by applying two axial forces that clamp the pads against the disc. In this study, the braking forces have to be enough to arrest the vehicle under the working conditions presented in Tab. 1. During a braking, the normal (F n ) and tangential (F t ) forces on one front wheel can be expressed as [16,20]: 1 2 n F f m g k      , 1 2 t ad ad F V f f m g k f         , where: f is the dynamic load distribution coefficient on front wheels, k represents the vehicle inertia coefficient f ad is the adherence coefficient between tyre and road. The braking torque applied to one wheel can be calculated as [20,21]: 2 o b t C M F    ; consequently, the braking force pad F (normal force on a single pad) is equal to: 1 2 b pad f M F f d    , where: f f is the disc/pad friction coefficient d is moment arm, which value is 125.1 mm.