A Physical-Based Plane Stress Constitutive Model for High Strength AA7075 under Hot Forming Conditions
Abstract
:1. Introduction
2. Experimentation
2.1. Material
2.2. Test Programme
2.2.1. Uniaxial Hot Tensile Test
2.2.2. Microstructure Observation
3. Material Modelling
3.1. A Unified Dislocation Mechanics-Based Material Model
3.1.1. Viscoplasticity Law
3.1.2. Modelling of Dislocation Density and Material Hardening
3.1.3. Modelling of Recrystallization Volume Fraction and Grain Size
3.1.4. Modelling of Damage
3.2. Extension to Plane Stress State
3.3. Plane Stress Dislocation Mechanics-Dominant Constitutive Model
4. Microstructure Examination Results
5. Results of Material Model Prediction
5.1. Determination of Material Model Constants
5.2. Hot Flow Behavior
5.3. Comparisons with Phenomeonlogical Models
6. Conclusions
Author Contributions
Funding
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Zn | Mg | Cu | Si | Fe | Mn | Cr | Ti | Al |
---|---|---|---|---|---|---|---|---|
5.1–6.1 | 2.1–2.9 | 1.2–2.0 | 0.4 | 0.5 | 0.3 | 0.18–0.28 | 0.2 | Remain |
Uniaxial Equations |
Plane Stress Extension |
- |
Parameters | Values | Parameters | Values | Parameters | Values |
---|---|---|---|---|---|
(MPa) | (MPa) | (MPa) | 0.2501 | ||
(J/mol) | 2.347 × 104 | (J/mol) | 2.98 × 104 | (J/mol) | 2.2 × 104 |
(-) | 0.02059 | (-) | (MPa) | ||
(J/mol) | 2.336 × 104 | (J/mol) | 4.38 × 104 | (J/mol) | 1.25 × 104 |
(-) | (-) | () | 1.31 × 10−4 | ||
(J/mol) | 2.046 × 104 | (J/mol) | 3243 | (J/mol) | 3490 |
(-) | () | (J/mol) | 1.38 × 104 | ||
6795 | (-) | 0.08028 | (-) | 0.04528 | |
(J/mol) | 1.51 × 104 | (J/mol) | 3.493 × 104 | (J/mol) | |
() | 1.14 × 104 | (-) | 0.0497 | (s) | 5.72 × 10−9 |
(J/mol) | 7.5 × 104 | (-) | (-) | ||
(-) | 20 | (-) | 2.088153 | () | 35 |
(-) | (-) | 6 | (-) | 10 | |
() | 800.49 | (J/mol) | 5.0 × 104 | (-) | |
(J/mol) | 1.003 × 105 | (J/mol) | 2.18 × 104 | (-) | 7.5 |
(-) | (-) | 0.03086 | w20 (-) | ||
(J/mol) | 4.241 × 104 | (J/mol) | 7.915 × 104 | (-) | 2.08 × 10−7 |
Value | |||
Conditions | 0.1/s | 1/s | 5/s |
350 °C | 0.01326 | 0.02382 | 0.5837 |
400 °C | 0.0682 | 0.01455 | 0.06062 |
mValue | |||
Conditions | 0.1 | 0.2 | 0.3 |
350 °C | 0.09412 | 0.10417 | 0.11041 |
400 °C | 0.20178 | 0.19181 | 0.18821 |
1015.67 | −0.00325 | −0.44101 |
1.60276 | 0.00478 | −980.35 |
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Chen, F.; Qu, H.; Wu, W.; Zheng, J.-H.; Qu, S.; Han, Y.; Zheng, K. A Physical-Based Plane Stress Constitutive Model for High Strength AA7075 under Hot Forming Conditions. Metals 2021, 11, 314. https://doi.org/10.3390/met11020314
Chen F, Qu H, Wu W, Zheng J-H, Qu S, Han Y, Zheng K. A Physical-Based Plane Stress Constitutive Model for High Strength AA7075 under Hot Forming Conditions. Metals. 2021; 11(2):314. https://doi.org/10.3390/met11020314
Chicago/Turabian StyleChen, Fulong, Haitao Qu, Wei Wu, Jing-Hua Zheng, Shuguang Qu, Yujie Han, and Kailun Zheng. 2021. "A Physical-Based Plane Stress Constitutive Model for High Strength AA7075 under Hot Forming Conditions" Metals 11, no. 2: 314. https://doi.org/10.3390/met11020314