Atomic-Scale Investigation of Deformation Behavior and Dislocation Evolution During Metal Spinning Based on Molecular...

Area of Science:

• Materials Science
• Mechanical Engineering
• Computational Modeling

Background:

• Metal spinning is prone to stress concentration and defects due to complex loading and friction.
• Understanding local deformation and dislocation evolution is crucial for process optimization.

Purpose of the Study:

• Investigate the effects of process parameters and temperature on metal spinning.
• Analyze mechanical response, material flow, contact loading, and dislocation evolution.
• Provide theoretical guidance for optimizing thin-walled spinning components.

Main Methods:

• Established a molecular dynamics model for metal spinning.
• Simulated the effects of arc radius, indentation depth, and tangential velocity.
• Analyzed normal and tangential forces and dislocation structures at varying temperatures.

Main Results:

• Optimal deformation coordination achieved with specific arc radius (25 Å), indentation depth (8 Å), and tangential velocity (1.5 Å/ps).
• Normal and tangential loads are sensitive to process parameters and decrease with increasing temperature.
• Elevated temperatures suppress dislocation accumulation and simplify dislocation structures, favoring primary slip modes.

Conclusions:

• Revealed local deformation and dislocation evolution mechanisms during metal spinning.
• Demonstrated the significant impact of temperature on suppressing defects and simplifying plastic deformation.
• Provided theoretical insights for optimizing metal spinning processes for thin-walled components.