A methodology for the modelling of the variability of brake lining surfaces

This paper presents a methodology for the modelling of the variability of brake linings. The impact of the contact surface topography on thermal and braking noise issues is well known but the behaviour of its variability is still barely studied. We propose to introduce it in finite element models using stochastic processes (e.g. random variables and random fields). Therefore, the surfaces of pads after four different braking conditions, (i) unworn, (ii) normal customer, (iii) sporty customer, (iv) high temperature, and at three different levels (i) topographical, (ii) structural and (iii) tribological are statistically studied. The measurements confirm the high variability of the surfaces and that they can be modelled by means of stochastic processes. Computations of realistic contact pressure distributions and local frictional laws depending on the contact pressure, velocity and temperature are presented.

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