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| Thickness Effect on Fatigue Property of 7050-T7451 Aluminum Alloy Plate |
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| DOI：10.7643/issn.1672-9242.2023.05.006 |
| KeyWord:7050-T7451 aluminum alloy plate fatigue property thickness effect inhomogeneity |
| Author | Institution |
| NIE Kai |
AVIC Chengdu Aircraft Design and Research Institute, Chengdu , China |
| WANG Fan |
AVIC Chengdu Aircraft Design and Research Institute, Chengdu , China |
| WANG Qiang |
AVIC Chengdu Aircraft Design and Research Institute, Chengdu , China |
| SHU Yang |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| LUO Jin-wei |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
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| Abstract: |
| The work aims to study the thickness effect on fatigue property of 7050-T7451 aluminum alloy plates with different thickness. The samples were taken from different locations along the thickness direction of three plates with different thickness (75 mm, 150 mm, and 203 mm). The grouping tests were performed for the three levels of stress-fatigue tests. By analyzing the fatigue test data, the variation law of fatigue property along the plate thickness and sampling thickness location was discovered and summarized. Among the three plates with different thickness, the fatigue strength of the surface layer was the best and varied slightly. For the plate with thickness of 75 mm, the fatigue property changed a little with the varying sampling thickness location. For the plates with thickness of 150 mm and 203 mm, the fatigue property showed nonlinear variation tendency from surface to the center and decreased firstly, and then increased and the maximum stress reduction corresponding to fatigue life of 105 cycleswas about 21%. As the plate became thicker, the maximum stress (fatigue life was 105 cycles) of the surface layer with the worst fatigue decreased by about 20%. As the plate thickness increased, the fatigue property of 7050-T7451 aluminum alloy plate shows much more significant thickness effect, that is to say, the inhomogeneity of fatigue property along the thickness direction becomes more and more obvious. The engineers should consider the impact of thickness effect of 7050-T7451 aluminum alloy plate on the fatigue strength of structure in the design process. |
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