Disk-like SPH法を用いた弾塑性体の摩擦界面に関する研究

抄録

A large-scale parallel computing model based on the SPH (Smoothed Particle Hydrodynamics) method was developed for dry shear friction between elastic-plastic solids. Our main purpose is to elucidate the mechanism of the frictional wear and heat generation between the asperities on the interface in meso-scale. In our model, the elastic-plastic motion is expressed by the general SPH method for the solid. The frictional interaction between the asperities is also added as a two-body interaction between SPH particles. In thus general SPH model, the isotropic weighting function is used and the SPH particle is the isotropic sphere. However, the surface roughness of the real metal interfaces is very small with respect to the size of the frictional surface area. The aspect ratio between the sliding direction and the thickness direction of the asperities is very large. For the modified model, we propose a method using coordinate transformation, in which the unit length between the shearing direction and the direction perpendicular to the shear plane is different. We call it the “Disk-like SPH method”. We show the validity of thus model and think it as the effective coarsening scheme to clear the wear and heat generation at the real surface.