Presentation Information
[3E03]Frictional dynamics of deformable solids from local slips to sonic-speed sliding
*Wataru Iwashita1 (1. National Institute of Advanced Industrial Science and Technology (AIST))
We investigate friction in deformable solids under non-uniform stress fields, aiming to understand how surface geometry and material properties affect frictional behavior beyond Amontons-Coulomb law. Using 3D FEM simulations and a simplified 1D model, we analyze how grooves affect static friction and slip nucleation. We find that the reduction of system stiffness due to forming grooves destabilizes slip nucleation, resulting in lower static friction. We also examine high-speed sliding near the material’s sound speed, where viscoelastic asymmetry causes a sharp rise in friction and scaling laws break down. These insights highlight the potential of surface design for friction control and are relevant to applications involving high-speed contact, such as aircraft tires at landing.