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On the Aptness of Material Constitutive Models for Simulating Nano-Scratching Processes
Hao Shen1, Sivakumar Kulasegaram1, Emmanuel Brousseau1
1School of Engineering, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK.
Materials (Basel, Switzerland)
|September 14, 2024
Summary
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.
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.
