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A Modified Johnson Cook Model-Based Kalman Filter Method to Determine the Hot Flow Behavior of Sustainable AA6082 Al
Bandar Alzahrani1, Ali Abd El-Aty1, Sherif A Elatriby2,3
1Department of Mechanical Engineering, College of Engineering at Al Kharj, Prince Sattam Bin Abdulaziz University, Al Kharj 11942, Saudi Arabia.
Materials (Basel, Switzerland)
|November 9, 2024
Summary
This study introduces a new modified Johnson-Cook (JC) model (PJCM) to accurately predict the hot deformation behavior of AA6082 alloys. The PJCM demonstrates superior reliability compared to existing models, enhancing manufacturing processes.
Area of Science:
- Materials Science
- Mechanical Engineering
- Sustainable Manufacturing
Background:
- AA6082 alloys are crucial for sustainable development, offering recyclability and enabling lightweight designs for reduced emissions.
- However, limited room-temperature formability necessitates elevated-temperature processing, requiring accurate constitutive models.
- Understanding alloy behavior under varying temperature (T) and strain rate (ε˙) is vital for component manufacturing.
Purpose of the Study:
- To propose and validate a new modified Johnson-Cook (JC) model, termed PJCM, for predicting the hot flow behavior of AA6082 alloys.
- To compare the predictive accuracy of the proposed PJCM against the original JC model (OJCM) and a previously modified JC model (LMJCM).
- To analyze the influence of temperature, strain, and strain rate interactions on alloy behavior during hot deformation.
Main Methods:
- Experimental determination of AA6082 alloy flow stress under a wide range of temperatures and strain rates.
- Development of a new modified Johnson-Cook plasticity model (PJCM).
- Comparative analysis of PJCM, OJCM, and LMJCM using correlation coefficient (R), average absolute relative error (AARE), and root mean square error (RMSE).
Main Results:
- The proposed PJCM demonstrated high reliability in predicting the warm/hot flow stress of AA6082 alloys.
- PJCM predictions closely matched experimental data, outperforming or matching OJCM and LMJCM.
- The study identified complex nonlinear behavior attributed to the interaction between strain rate, strain, and temperature during hot deformation.
Conclusions:
- The developed PJCM offers an improved constitutive model for accurately simulating the hot deformation of AA6082 alloys.
- This enhanced modeling capability supports the efficient and reliable manufacturing of components from these sustainable materials.
- Further investigation into the interplay of deformation parameters is recommended to fully understand the complex nonlinear behavior.
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