Ultrasonic impact peening technique for improvement the constant amplitude corrosion-fatigue interaction

The fatigue behavior of 6061-T6 aluminum alloy under constant amplitude loading was investigated in air for as-received and pre-corroded specimens in 3.5% NaCl corrosive solution for 77 days. Constant corrosion-fatigue tests have been done with and without ultrasonic peening treatment under rotating...

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Bibliographic Details
Published in:International journal of energy and environment 2018-05, Vol.9 (3), p.295-302
Main Authors: Al-Alkawi, Hussain J Mohammed, Majeed, Amer H, Naser, Saba Farhan
Format: Article
Language:English
Subjects:
Aircraft
Alloys
Aluminum
Aluminum alloys
Aluminum base alloys
Amplitudes
Corrosion
Corrosion effects
Corrosion fatigue
Corrosion resistance
Corrosion tests
Cyclic loads
Fatigue life
Fatigue strength
Fatigue tests
Metal fatigue
Peening
Reduction
S N diagrams
Sodium chloride
Steel pipes
Stress concentration
Stress ratio
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Summary:The fatigue behavior of 6061-T6 aluminum alloy under constant amplitude loading was investigated in air for as-received and pre-corroded specimens in 3.5% NaCl corrosive solution for 77 days. Constant corrosion-fatigue tests have been done with and without ultrasonic peening treatment under rotating bending load at stress ratio (R= -1) and room temperature (RT= 25 °C). The experimental results presented that the tests of fatigue life on pre-corroded specimens with and without ultrasonic peening revealed a significant reduction in life related with the presence of corrosion defects before cyclic loading. In state of unpeened 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 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 of ultrasonic peening treatment was 8.69% and 2.3% respectively.
ISSN:2076-2895
2076-2909