Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy
Abstract
:1. Introduction
2. Methods
3. Results
3.1. Flow Stress–Strain Relationship and Thermal–Mechanical Behavior under Impact Condition
3.2. Dynamic Impact Constitutive Model
3.3. Micro-Morphology Analysis of Materials in Impact State
4. Conclusions
- Through analysis of the real stress–strain curve, it is founded that when the ambient temperature is 298.15~473.15 K and the strain rate is high, the dynamic mechanical response behavior of 6082 aluminum alloy shows that the internal thermal softening effect of the material is dominant in the competition with work hardening (strain hardening), resulting in a decrease in the flow stress of 6082 aluminum alloy, and the elastic modulus is negatively correlated with the strain rate and temperature. Yield strength is negatively correlated with temperature and positively correlated with strain rate.
- Based on the Johnson–Cook rheological stress–strain constitutive model, the strain- rate strengthening term and temperature softening term in the model are appropriately improved by introducing absolute heating, and the improved constitutive model is obtained as follows: . By comparing the constitutive model with the experimental curve, it is found that the optimized model can fit well with the experimental curve, and it can also reflect the competitive dynamics of strain hardening and high temperature softening of materials at high strain rate. This verifies the accuracy of the model and provides a theoretical basis for the engineering application of materials.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Dynamic Impact | Quasi-Static Compression | |||||||
---|---|---|---|---|---|---|---|---|
Temperature/K | strain rate () | 1 × 10−1 S−1 | Sample 1 | |||||
1000 | 2000 | 3000 | 6000 | 7000 | 7500 | 8 × 10−2 S−1 | Sample 2 | |
298.15 | Sample 8 | Sample 16 | Sample 17 | 6 × 10−2 S−1 | Sample 3 | |||
323.15 | Sample 9 | Sample 10 | 5 × 10−2 S−1 | Sample 4 | ||||
373.15 | Sample 11 | Sample 12 | Sample 18 | Sample 19 | 3 × 10−2 S−1 | Sample 5 | ||
473.15 | Sample 13 | Sample 14 | Sample 15 | Sample 20 | Sample 21 | Sample 22 | 2 × 10−2 S−1 | Sample 6 |
6 × 10−3 S−1 | Sample 7 |
Strain Rate (10−2 S−1) | |||||||
---|---|---|---|---|---|---|---|
0.6 | 2 | 3 | 5 | 6 | 8 | 10 | |
Yield strength (MPa) | 233.4 | 256.8 | 277.4 | 288.5 | 298.6 | 317.3 | 335.3 |
A/MPa. | B/MPa | C | n | m |
---|---|---|---|---|
233.4 | 404 | 0.43 | 0.74 | 1.83 |
A/MPa. | B/MPa | |||||
---|---|---|---|---|---|---|
233.4 | 404 | 0.81 | 0.74 | 1.83 | −0.03 | −3.1 |
Strain rate (S−1) | 1000 | 2000 | 3000 | ||
Absolute warming (ΔT)/K | 306.15 | 327.75 | 385.35 | 403.15 | 429.75 |
Ambient temperature (T)/K | 473.15 | 473.15 | 323.15 | 373.15 | 473.25 |
Theoretical temperature (ΔT+T)/K | 779.3 | 800.9 | 708.5 | 776.3 | 909.2 |
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Zhang, Q.; Huang, X.; Guo, R.; Chen, D. Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy. Materials 2022, 15, 7618. https://doi.org/10.3390/ma15217618
Zhang Q, Huang X, Guo R, Chen D. Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy. Materials. 2022; 15(21):7618. https://doi.org/10.3390/ma15217618
Chicago/Turabian StyleZhang, Qinmin, Xiaomin Huang, Ran Guo, and Dongyu Chen. 2022. "Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy" Materials 15, no. 21: 7618. https://doi.org/10.3390/ma15217618