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| Fatigue Properties and Failure Mechanisms of Single-lap Chemical Milling on 2024-T3 Aluminum Alloy Sheet |
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| DOI：10.7643/issn.1672-9242.2022.10.009 |
| KeyWord:2024-T3 aluminum alloy chemical milling sheet single-lap fatigue test fretting wear steps method |
| Author | Institution |
| YANG Ting-yong |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
| DENG Wen |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
| LI Jian-wei |
Aviation Military Representative Office of the Aviation Military Representative Bureau of the Army Equipment Department in Jingdezhen, Jiangxi Jingdezhen , China |
| ZHU Zhi-peng |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
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| Abstract: |
| This paper aims to study the fatigue properties and failure mode of 2024-T3 aluminum alloy single-lap chemical milling sheet. We carried out the fatigue test on chemical milling sheet joint with different sizes by using the step-by-step method, processed the fatigue strength data by using the Nair test method, observed the typical fatigue fracture, and analyzed by using the scanning electron microscope and Energy spectrum analysis. We compared the effects of substrate thickness and rivet aperture on the fatigue strength of aluminum alloy chemical milling sheet joint as well as analyzed and discussed the fatigue failure mode and mechanism of 2024-T3 aluminum alloy single-lap chemical milling sheet joint. The result shows that the substrate thickness has a great influence on the fatigue strength of 2024-T3 aluminum alloy chemical milling sheet jointwhile the rivet aperture has little influence.With the increase of substrate thickness, the fatigue strength of aluminum alloy chemical milling sheet joint shows a gradual decreasing trend. For two kinds of rivet holes (3 mm and 4 mm), the fatigue strength of chemical milling sheet joint with thickness of 1.8 mm is 13.2% and 13.0% lower than that of 0.6 mm respectively. With the increase of substrate thickness, the fatigue failure mode of aluminum alloy milling sheet joint changes from rivet head failure of upper substrate to button failure of lower substrate and rivet fracture failure in the end. In addition, the fretting wear of the lap joint is intensified and fatigue crack initiation is accelerated, which is the main reason for the significant reduction of fatigue strength of 2024-T3 aluminum alloy milling sheet joint. |
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