OS6-1-4 フォノンエネルギー散逸を取り込むシミュレーション手法の開発と固体間摩擦解析(OS6 マイクロナノトライボロジー(1))

Abstract

We develop a new scheme of atomic-level simulation to depict phonon-energy dissipation in order to investigate friction between solids. Excitation of a long-wavelength phonon at the interface during shear plays a role of energy dissipation in a solid. Although a huge number of solid atoms is required for such energy-dissipative phonon, the number is so large that it is unattainable to be simulated by conventional molecular dynamics technique. We, therefore, propose a semi-infinite dynamic lattice Green's function method and a correction method, that include the existence of infinite number of solid atoms. These methods can correctly realize the phonon-energy dissipation in the solid friction. The result obtained by the methods shows dependence of the solid friction on inner-solid properties that determines the phonon character, as well as the interface interaction.