MANUTECH-SISE > Axe Scientifique 2


The Axis 2 "KNOWLEDGE BASED DESIGN" aims to develop a selection methodology for surface treatments and production processes to improve the operating performance of surfaces.
This axis develops an inductive approach, starting from the application to reach the understanding of the fundamental phenomena occurring at surface scales (contact, reactivity, chemical and mechanical coupling, ...). This approach implies to add a modeling approach.

Generic issues highlighted in this topic are:

  • Which intrinsic properties of a material and its surface are to be optimized to achieve the required functional properties?
  • How to control and optimize production processes and their induced effects on surfaces?

The axis has three unifying themes:

1. Reduce friction and wear in lubricated environments.

This theme is a strong point of the LABEX gathering laboratories which, for the most of them, have conducted extensive research in this field.

DLC coating on the femoral head of a hip prosthesis

Stress distribution in a coating, induced by a sliding contact

2. Surface modifications resulting from contact loadings and induced consequences for engineering parts

This research axis is a common point of interest for the different laboratories belonging to Manutech-SISE. It is strongly connected to “Tribologically Transformed Structures” induced by sliding tests, surface nanocrystallisation induced by surface mechanical treatments or the unwilled machining-induced “white layer”. Despite different denominations, the underlying physical phenomena involved are almost the same (severe plastic deformation, high strain rate, elevated temperature), and are mostly related to the dynamic recrystallization/restauration ability of surfaces when they are submitted to severe contact loadings. These modified zones can strongly affect surface reactivity, fatigue life and more globally engineering parts sustainability. It is thus a current crucial need for industrial renewal as it opens interesting research ways to tailor surfaces without using additional coatings or thermochemical treatments.

Machining-induced white layer

Surface nanocristallisation induced
by severe shot peening

3. Providing surface properties suitable for structures lightening

This research can be seen as an emerging topic, with yet few studies by LABEX members and attracting some attention in both academic and industrial level. It concerns both the functionalization of polymers and coatings by processes compatible with low temperature deposition (sol-gel, Dynamic Chemical Plating ...)

Texturing of polypropylene using a femtosecond laser
(PhD thesis- V Belaud LTDS-ECL)

The keywords describing the outline of the axis are:
  • Functional properties of material surfaces
  • Intrinsic properties of materials
  • Control of surface processing
  • Sustainability of surfaces
  • Tribology
  • Surface reactivity
  • Surface mechanics
  • Prediction, modeling
  • Surface, interface, environment.
  • Tailoring surface properties
  • Surface processing technology
  • Physics and Mechanics of Material