Abstract
Interfacial temperatures have been measured using fibre opticinserts in the stationary brake ring during ring-on-ring, subscaledynamometer aircraft brake testing. The brake materials are carbonfibre-reinforced, carbon-matrix (carbon-carbon) composites. Thetemperature distribution varies with dynamometer test conditions anddemonstrates the non-uniformity of contact pressure within the interface.A two-dimensional, axis-symmetric finite element model (FEM) is presentedthat is used to estimate temperature profiles during braking using eithera constant pressure or constant energy flux assumption. The modelincorporates the measured temperature-dependence of the thermaldiffusivity and specific heat capacity for the composite materials. Thesurface temperatures obtained from the FEM are compared with the measuredsurface temperatures. Substantial differences between the two results areobserved and discussed.
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