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On the Aptness of Material Constitutive Models for Simulating Nano-Scratching Processes.

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The Johnson-Cook model provides more accurate simulations of nano-scratching forces and topography on copper than the elasto-plastic model. This research highlights the importance of selecting appropriate material models for precise smooth particle hydrodynamics (SPH) simulations.

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Area of Science:

  • Materials Science
  • Computational Mechanics
  • Surface Engineering

Background:

  • Smooth Particle Hydrodynamics (SPH) is increasingly used for simulating nano-scratching on metallic substrates.
  • Existing SPH models primarily utilize either the Johnson-Cook or elasto-plastic constitutive models for material flow.
  • A clear understanding of which model yields superior quantitative predictions for nano-scratching is lacking.

Purpose of the Study:

  • To quantitatively compare the predictive accuracy of the Johnson-Cook and elasto-plastic material models in SPH simulations of copper nano-scratching.
  • To evaluate the influence of these models on simulated cutting/normal forces and machined surface topography.
  • To determine the preferable constitutive model for SPH-based nano-scratching simulations.

Main Methods:

  • Simulating nano-scratching of copper using SPH with both Johnson-Cook and elasto-plastic material models.
  • Comparing simulated cutting forces, normal forces, and surface topography against experimental data from literature.
  • Analyzing the effects of varying cut depths and cutting speeds on simulation outcomes for each material model.

Main Results:

  • SPH simulations using the Johnson-Cook model yielded cutting and normal forces that more closely matched experimental data compared to the elasto-plastic model.
  • The cross-sectional profiles of nano-grooves simulated with the Johnson-Cook model showed better agreement with experimental results.
  • The Johnson-Cook model demonstrated superior performance in predicting forces and topography across different cutting depths and speeds.

Conclusions:

  • The Johnson-Cook material model is preferable for SPH modeling of nano-scratching processes, particularly for quantitative prediction of outcomes.
  • Accurate selection of material constitutive models is critical for reliable SPH simulations in surface engineering and materials processing.
  • This study provides valuable insights for researchers and engineers employing SPH for micro/nano-scale material deformation simulations.