A method for determining dislocation instability in a cutting deformation zone based on molecular dynamics simulation

By extracting the dislocation line length, defect atomic spatial distribution, and atomic potential energy parameters in the cutting deformation zone using molecular dynamics simulation, a comprehensive instability index is constructed, solving the problem of dislocation instability determination in existing technologies and achieving more accurate judgment of dislocation instability state.

CN122413673APending Publication Date: 2026-07-17ANHUI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI UNIV
Filing Date
2026-04-13
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing dislocation analysis methods are difficult to effectively characterize the spatiotemporal characteristics of dislocations during cutting deformation. In particular, under vibration cutting conditions, the instability behavior of dislocations inside the material is difficult to accurately determine, which affects the quality of the machined surface.

Method used

By constructing a molecular dynamics cutting simulation model, the dislocation line length parameter, defect atomic spatial distribution parameter, and atomic potential energy parameter are extracted. The dislocation burst index, defect concentration coefficient, and potential energy fluctuation coefficient are determined respectively, and then normalized to a benchmark and fused into a comprehensive instability index to determine whether the cutting deformation zone is in a dislocation instability state.

Benefits of technology

It provides a more comprehensive method for determining dislocation instability, which can accurately capture the time-varying characteristics, spatial distribution characteristics, and energy change characteristics of dislocations, thereby improving the accuracy and comprehensiveness of determining dislocation instability in the cutting deformation zone.

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Abstract

The application belongs to the technical field of cutting simulation, and particularly relates to a cutting deformation zone dislocation instability judgment method based on molecular dynamics simulation, atomic scale simulation data of a cutting process is obtained; dislocation line length parameters, defect atomic space distribution parameters and atomic potential energy parameters are extracted from the simulation data; a dislocation burst index is determined based on the dislocation line length parameters, a defect concentration coefficient is determined based on the defect atomic space distribution parameters, and a potential energy fluctuation coefficient is determined based on the atomic potential energy parameters; three types of indexes are respectively subjected to benchmark normalization to obtain corresponding normalized judgment values; a comprehensive instability index is determined according to the normalized judgment values; and whether the cutting deformation zone is in a dislocation instability state is judged according to the relationship between the comprehensive instability index and a preset instability critical value. The time-varying characteristics, space distribution characteristics and energy change characteristics of dislocation evolution are included in the unified judgment framework, and compared with a single index analysis method, the dislocation instability state of the cutting deformation zone can be more comprehensively reflected.
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