ENHANCEMENT OF CUMULATIVE CORROSION-FATIGUE INTERACTION LIVES OF 6061-T6 ALUMINUM ALLOY USING ULTRASONIC IMPACT PEENING PROCESS
The fatigue behavior of the 6061-T6 aluminum alloy under constant and variable amplitude loading was investigated in the air for as-received and pre-corroded specimens in 3.5% NaCl corrosive solution for 77 days. The experimental results presented that the tests of fatigue life on pre-corroded samp...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Arabic |
| Published: |
Mustansiriyah University/College of Engineering
2019-07-01
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| Series: | Journal of Engineering and Sustainable Development |
| Subjects: | |
| Online Access: | https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/244 |
| Summary: | The fatigue behavior of the 6061-T6 aluminum alloy under constant and variable amplitude loading was investigated in the air for as-received and pre-corroded specimens in 3.5% NaCl corrosive solution for 77 days. The experimental results presented that the tests of fatigue life on pre-corroded samples with and without ultrasonic peening revealed a significant reduction in life-related with the presence of corrosion defects before cyclic loading. In-state of unpeeled specimens the constant S-N fatigue strength curve was decreased by 4.5% due to immersed the specimens in corrosive 3.5% NaCl solution for 77 days, while in state of ultrasonically peened specimens for 10 sec. per line and 2.5 joul energy the reduction of S-N curve decreased to 2.2% due to the beneficial effect of this treatment for increasing the corrosion-fatigue life. The improvement of fatigue life and corrosion-fatigue life of specimens when applying ultrasonic peening was 8.69% for dry fatigue life and 2.3% for corrosion-fatigue interaction. The results of cumulative corrosion-fatigue tests indicated that the life of corroded specimens under the effect of ultrasonic peening treatment improved to approximately (3% ـــ 2.25%) for low-high and high-low sequences.
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| ISSN: | 2520-0917 2520-0925 |