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| Evaluation of Fatigue Initial Life for Aluminum Alloy with Pre-corrosion |
| Received:March 05, 2012 Revised:October 15, 2012 |
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| DOI： |
| KeyWord:aluminum alloy SEM in-situ technology pre-corrosion fatigue small crack |
| Author | Institution |
| LI Xu-dong |
Qingdao Branch of Naval Aeronautical Academy，Qingdao ，China |
| MU Zhi-tao |
Qingdao Branch of Naval Aeronautical Academy，Qingdao ，China |
| LIU Zhi-guo |
Qingdao Branch of Naval Aeronautical Academy，Qingdao ，China |
| ZHU Wu-feng |
Qingdao Branch of Naval Aeronautical Academy，Qingdao ，China |
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| Abstract: |
| Aluminum alloy is widely used in aviation industry, which makes it a key issue to evaluate the life aluminum components. Fatigue crack initiation and early stage propagation behavior of pre-corroded aluminum alloy under stress cycle was studied using scanning electron microscopy (SEM) in-situ observation. Results indicated that corrosion pit has significant influence on fatigue crack initiation and early stage propagation. A formula to evaluate the small fatigue crack initiation life of aluminum alloy with different corrosion damage was proposed based on local strain method. |
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