1. Characterization of sheet metal surface properties before and after friction
Observation of the sheet's surface condition before and after rubbing provides invaluable elements of interpretation from two points of view:
extrapolation of friction test results to pressure, speed or temperature conditions not accessible experimentally on tribometers;
transposition of results to industrial forming conditions and assessment of risks of degradation due to tool wear or "clogging" (excessive transfer).
1.1 Microscopy and image analysis
Optical reflection microscopy of the sheet metal surface at magnifications of the order of 75 or more provides a rapid, qualitative assessment of the surface's initial topography, in particular its degree of anisotropy (
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Characterization of sheet metal surface properties before and after friction
Mechanisms of plate-tool interaction under the blank holder
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