Effect of Microstructure on Fatigue Damage Accumulation in 7075 Aluminum Alloy Subjected to a Single Compressive Overload
Abstract
:1. Introduction
2. Material and Experiments
3. Numerical Framework
3.1. Dual-Scale Modeling
3.1.1. Macro-Scale Model
3.1.2. Micro-Scale Model
3.2. Constitutive Models and Parameter Determination
3.2.1. CPFEM–LCFD Model
3.2.2. Chaboche–LCFD Model
3.2.3. Low-Cycle Fatigue Damage-Evolution Model
3.3. Parameter Determination
4. Results and Discussions
4.1. Deformation and Tensile Residual Stress Distribution Ahead of Crack Tip
4.2. Damage Evolution Ahead of Crack Tip
4.3. Effect of Grain Orientation on Damage Evolution Ahead of Crack Tip
4.4. Effect of Orientations of Nearest Neighbor Grains on Damage Evolution Ahead of Crack Tip
5. Conclusions
- (1)
- The ratchetting strain ahead of the crack tip increases with the level of compressive overload ratio, which is attributed to the fact that higher compressive overloading induces greater tensile residual stress ahead of the crack tip.
- (2)
- The number of activated slip systems ahead of the crack tip increases with an increase in compressive overloading. This causes the rate of dislocation multiplication to be faster, thereby accelerating the accumulation of fatigue damage.
- (3)
- The effect of compressive overload changes the activity of slip system, which is another factor accelerating the damage accumulation after the compressive overload. Furthermore, the change in slip system activity caused by the effect of compressive overload depends on the grain orientation.
- (4)
- For a grain ahead of the crack tip, the acceleration of fatigue damage accumulation caused by the effect of compressive overload is influenced by the orientation of its nearest neighbor grains.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Composition | Si | Cu | Fe | Mn | Mg | Zn | Cr | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
Content (wt%) | 0.09 | 1.7 | 0.21 | 0.1 | 2.5 | 5.7 | 0.21 | 0.04 | Bal. |
Element | A2 | A3 | A6 | B2 | B4 | B5 | C1 | C3 | C5 | D1 | D4 | D6 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
A2 | L0 | L1 | L1 | L3 | L4 | L4 | L2 | L4 | L5 | L2 | L5 | L4 |
A3 | L0 | L1 | L4 | L2 | L5 | L4 | L3 | L4 | L5 | L2 | L4 | |
A6 | L0 | L5 | L5 | L2 | L5 | L4 | L2 | L4 | L4 | L3 | ||
B2 | L0 | L1 | L1 | L2 | L5 | L4 | L2 | L4 | L5 | |||
B4 | L0 | L1 | L5 | L2 | L4 | L4 | L3 | L4 | ||||
B5 | L0 | L4 | L4 | L3 | L5 | L4 | L2 | |||||
C1 | L0 | L1 | L1 | L3 | L4 | L4 | ||||||
C3 | L0 | L1 | L4 | L2 | L5 | |||||||
C5 | L0 | L4 | L5 | L2 | ||||||||
D1 | L0 | L1 | L1 | |||||||||
D4 | L0 | L1 | ||||||||||
D6 | L0 |
L1 | L2 | L3 | L4 | L5 | L6 |
---|---|---|---|---|---|
0.068 | 0.068 | 0.0454 | 0.625 | 0.137 | 0.122 |
C11 | C12 | C44 | K | n | r1 | r2 | τ0 |
98,413 MPa | 44,215 MPa | 27,099 MPa | 35 MPa | 50 | 27,000 MPa | 650 | 175 MPa |
G | k1 | ψ | q | σY | M | ||
27,862 MPa | 5 × 106 m−1 | 0.55 | 205 MPa | 685 MPa | 460 MPa | 6.8 × 10−9 | 1.15 |
C1 | λ1 | C2 | λ2 | C3 | λ3 | Qsat | |
30,000 MPa | 350 | 3000 MPa | 70 | 265 MPa | 50 | 55 MPa | 15 MPa |
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Xie, C.; Sun, T.; Li, L.; Zheng, Z. Effect of Microstructure on Fatigue Damage Accumulation in 7075 Aluminum Alloy Subjected to a Single Compressive Overload. Metals 2024, 14, 980. https://doi.org/10.3390/met14090980
Xie C, Sun T, Li L, Zheng Z. Effect of Microstructure on Fatigue Damage Accumulation in 7075 Aluminum Alloy Subjected to a Single Compressive Overload. Metals. 2024; 14(9):980. https://doi.org/10.3390/met14090980
Chicago/Turabian StyleXie, Changji, Teng Sun, Li Li, and Zhanguang Zheng. 2024. "Effect of Microstructure on Fatigue Damage Accumulation in 7075 Aluminum Alloy Subjected to a Single Compressive Overload" Metals 14, no. 9: 980. https://doi.org/10.3390/met14090980