分子動力学法による塑性変形の散逸エネルギーに関する分子動力学的研究

 

氏名:李 響

所属:大阪大学大学院工学研究科

概要:To give a precise prediction of Taylor-Quinney coefficient (TQC), which represents the fraction of the conversion of external deformation work to heat during plastic deformation, molecular dynamic (MD) simulations of simple shear deformation was performed on newly constructed single-crystal atomic models of pure FCC metals (Al, Ni, Cu) at extremely high shear strain rate. A new equation for calculating TQC using the energy storage during the evolution of crystal defects during the deformation was proposed and used for calculating TQC during the simulation. The reliability of the new equation was verified by comparing the results with experimental data reported in literatures, and the result of TQC calculated by the conventional equation during the simulation. Furthermore, the dependence of TQC on stacking fault energy and crystal orientations were quantitatively investigated. As a result, the dependence of TQC on SFE and crystal orientations is due to the change in the mobility of crystal defects.

 

論文掲載,発表実績:

(国内研究会等発表論文)

  • Xiang Li, Ryo Matsumoto, Hiroshi Utsunomiya and Shigenobu Ogata, “The energy dissipation of the slip of edge dislocations of pure Aluminum”, the Japan Institute of Metals and Materials Autumn Meeting 2023, Toyama, Japan, Sept. 2023.

 




Posted : 2024年03月31日