Predicting the Johnson Cook constitutive model constants using temperature rise distribution in plane strain machining
| Autor: | Sepideh Abolghasem, Juan Camilo Osorio-Pinzon, J.P. Casas-Rodriguez |
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| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Materials science Mechanical Engineering Chip formation Constitutive equation 02 engineering and technology Mechanics Strain rate Strain hardening exponent Plasticity Chip Industrial and Manufacturing Engineering Computer Science Applications 020901 industrial engineering & automation Machining Control and Systems Engineering Hardening (metallurgy) Software |
| Zdroj: | The International Journal of Advanced Manufacturing Technology. 105:279-294 |
| ISSN: | 1433-3015 0268-3768 |
| Popis: | Johnson-Cook (JC) constitutive material model is the most common, yet simplest, model to describe the material behavior in machining that involves high strain and high strain rates accompanied with high temperature rise. Many studies have tried to predict JC model constants using computational and analytical procedures. However, these approaches are limited by computational costs and experimental restrictions. In this study, an original approach to determine the JC material model constants is proposed using the effects imposed by strain hardening, strain rate hardening, and thermal softening. An analytical approach is established upon the chip formation model in orthogonal cutting—plane strain machining—where the JC model is applied to calculate cutting energy due to plasticity and friction which ultimately involves temperature rise. Temperature is calculated at primary shear zone and secondary deformation zone using Oxley and modified Hahn’s models, which are dependent on material behavior and five JC constants. JC constants are calculated by performing a multi-objective optimization algorithm that searches for the minimum differences between the calculated temperature in the chip and the experimental results of temperature for different cutting conditions. The obtained JC constants are compared with the literature and close agreements are achieved. The appeal of the proposed methodology is in its low computational time, low experimental complexity, and low mathematical complexity. Finally, JC constants were used in finite element simulation of PSM to verify the model’s robustness and accuracy via comparing the cutting force, temperature distribution, and subgrain size of the chip for different cutting conditions. |
| Databáze: | OpenAIRE |
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