Effect of Corrosion on the Fatigue Behavior of 2024-T3 Aluminum Alloy

• Main Authors: Chien-HsiungWang, 王健雄
• Other Authors: Siu-Tong Choi
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/10456738190327065849

碩士 === 國立成功大學 === 航空太空工程學系專班 === 98 === In this study, the 2024-T3 aluminum alloy was used as base material. By using alternative immersion corrosion process with an artificial corrosive environment in laboratory, 2024-T3 aluminum alloy specimens were subjected to continual immersion-dry process in 3.5% sodium chloride solution for 7, 21, and 42 days, respectively. After the corrosion process, the specimens were then subjected to fatigue test at different stress levels and S-N curves of material under different corrosion level were obtained. In addition, through the use of Scanning Electronic Microscope, the depth and dimension of pitting on the fracture surface of specimens were observed. The experiment results show that the fatigue lives of specimens reduce as the exposure time increases. For example, at the stress level of 25 ksi, fatigue lives of specimens subjected to immersion-dry process for 42 days reduce approximately by 35% and 16%, respectively, as compared to those subjected to processes for 7 and 21 days. Furthermore, fatigue life of material was affected by the combined effects of pit depth, leading edge shape of pit, loss of cross-section, multiple fatigue cracks growth and stress.