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A sensor T which controls the tangential force imposes this displacement. 2. The optical photoelastic device 2, allows the continuous observation of the isochromatic field. 3. Load and displacement system 3, containing : measurement - sensors for normal (N) and tangential (T) load measurements, sensors for flat travel (DT) (sliding and slab deflexion), for the left edge (DG) and right edge (DD) slab sliding measurements. 4. measured parameters acquisition and treatment 4 : all signals are recorded and monitored during tests on an informatic system.

For want of being able to visualise the dynamics of the 3rd body, it is necessary to reconstitute it! We can call this the Pompei complex. Let’s continue this analogy with archaeology. Archaeology uses aerial reconnaissance. stratigraphic excavations, dendroclironology and different physical-chemistry analyses. It knows how to reconstruct reality, because it knows how to integrate each scale and each discipline within the generality. As for tribology, and in particular solid third bodies, it also draws advantage from studies made on different scales carried out by different disciplines.

With the exception of low relative humidity, the relative motion between TIN and alumina occurs under a gross slip regime and the shape of the friction force versus displacement loop is quasirectangular. In the 5% RH and 25% RH atmospheres, the relative motion between TiN and alumina went from partial slip to gross slip when increasing the displacement. All the curves showing the friction coefficient were characterised by an initial transient state where the friction coefficient increased rapidly, followed by a steady state.