Guilhem MOLLON
guilhem.mollon@insa-lyon.fr
Associate Professor
National Institute for Applied Sciences of Lyon
PhD, Civil Engineering, INSA Lyon
HDR, INSA Lyon
Guilhem MOLLON
guilhem.mollon@insa-lyon.fr
Associate Professor
National Institute for Applied Sciences of Lyon
PhD, Civil Engineering, INSA Lyon
HDR, INSA Lyon
This part of my research work consists in using particle-based computational techniques (such as Discrete Element Modelling, DEM, or the Multibody Meshfree Approach) to investigate the local rheology of the tribological third bodies in relation with their mechanical properties. It aims at reproducing various flow regimes, at understanding their causes and consequences, and at confronting them with experimental observations and measurements.
Figure 1. Wear model of a 3D rough and microstructured surface made of conformous polyedra linked by a damageable cohesive law.
Figure 2. 3D DEM model of the internal third body flow in a bolted joint submitted to vibrations.
Figure 3. Genral sketch of a local tribological simulation performed with the code MELODY: assembly of circular, discretized and deformable bodies sheared between two rough surfaces.
Figure 4. Granular flow regime.
Figure 5. Critical flow regime.
Figure 6. Agglomerated flow regime.
Figure 7. Plastic flow regime.
Figure 8. Variety of the internal flow structures of third bodies as observed in the parametric space defined by the deformability and the cohesion of the particles.
Figure 9. Illustrative experimental results of a steel interface sheared under two different gazeous environments (ambiant air and argon), leading to two different third body flow regimes.
Figure 10. Experimental fretting tests showing different flow regimes, and associated local simulation.