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| Applicability Analysis of Fatigue Life Assessment Method Equaling Pit as Initial Crack |
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| DOI：10.7643/issn.1672-9242.2022.05.011 |
| KeyWord:aero aluminum alloy LY12CZ pit equivalent crack fatigue life applicability analysis |
| Author | Institution |
| HU Jia-lin |
Navy Aviation University, Shandong Yantai , China |
| LIU Wen-lin |
Navy Aviation University, Shandong Yantai , China |
| YU Da-zhao |
Navy Aviation University, Shandong Yantai , China |
| BIAN Gui-xue |
Navy Aviation University, Shandong Yantai , China |
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| Abstract: |
| This paper aims to analyze the applicability of equating the dominant etch pits with initial cracks for fatigue life prediction. The pre-corrosion test of LY12CZ aluminum alloy was carried out, then specimens with different pitting degrees were obtained and compared. The ANSYS software was applied to finite element analysis of test pieces with different corrosion damage conditions to analyze the changes in stress distribution of the test pieces. The results showed that with the continuance of pre-corrosion test, both quantities and sizes of other pits in the zone near the critical pit increased. The ratio of the distance between craters to the radius of the crater, d/r, is used as an indicator, when d/r was less than 4, the other pits had an influence on the stress field of the critical pit, the average relative error of the fatigue life calculated by the pitting model is 19.94% compared with the test results. When d/r was more than 4, the stress concentration coefficient at the dominant erosion crater returns to the size of the single pit, and the average relative error of the fatigue life calculated by the pitting model is 3.74% compared with the test results. When d/r was more than 4, the influence of other pits on the stress distribution of the dominant pit can be ignored, and it is reasonable to use the dominant pit as the only fatigue source for life calculation. When d/r was less than 4, the stress distribution at the dominant pit is influenced by other pits, and a large error will occur when using the dominant pit as the only fatigue source for life calculation. |
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