研究目的
Investigating the effect of initial indentation position on the plastic deformation behaviors of polycrystalline materials through molecular dynamics simulation.
研究成果
The initial indentation position significantly affects the plastic deformation behaviors of polycrystalline materials, including indentation force variation, defect distribution range, and internal stress transmission. Defects and internal stress tend to transfer to low-dimensional microstructural components. The atomic potential energy and hydrostatic stress accumulation/release speeds vary with the initial indentation position.
研究不足
The study is limited by the computational scale of molecular dynamics simulations, which may not fully capture the macroscopic behavior of polycrystalline materials. Additionally, the effect of grain orientation and Schmidt factor was not considered.
1：Experimental Design and Method Selection:
Molecular dynamics (MD) simulations were performed to study the effect of initial indentation position on the elasticity/plastic deformation mechanism of polycrystalline copper.
2：Sample Selection and Data Sources:
A polycrystalline copper workpiece with an average grain size of
3：37 nm was used. List of Experimental Equipment and Materials:
A diamond indenter and a polycrystalline copper workpiece were used in the simulations.
4：Experimental Procedures and Operational Workflow:
The workpiece was equilibrated under isothermal/isobaric conditions before the nanoindentation simulation. The indenter was moved along the y-direction with a constant velocity.
5：Data Analysis Methods:
The center-symmetry parameter (CSP) method and common neighbor analysis (CNA) were used to identify atomic crystal structures. Atomic hydrostatic pressure and von Mises stress were calculated to analyze internal stress.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
