Equivalent crack size model for pre-corrosion fatigue life prediction of aluminum alloy 7075-T6
| Autor: | Benrun Hu, Lijie Chen, Yongfang Huang, Xubin Ye |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Correlation coefficient Aspect ratio Mechanical Engineering Alloy Metallurgy chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Corrosion 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials Aluminium Corrosion fatigue Modeling and Simulation Service life engineering Crack size General Materials Science 0210 nano-technology |
| Zdroj: | International Journal of Fatigue. 88:217-226 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2016.03.035 |
| Popis: | Corrosion damage can significantly reduce the service life of aluminum alloy structures and endanger the structural integrity of aircraft. Here, aiming at center-hole sheet specimens of aluminum alloy 7075-T6, uniaxial fatigue tests and post-fracture analysis are performed to investigate the effect of corrosion pits on the pre-corrosion fatigue behavior. Then the best correlated parameters between corrosion pits and equivalent cracks are identified through Pearson correlation analysis. It is found that for single-crack initiations ar ECS (equivalent crack depth ∗ aspect ratio) vs. ar cri (critical pit depth ∗ aspect ratio) are best correlated with correlation coefficient of 0.9, while the best correlated parameters for multi-crack initiations are ar ECS (equivalent crack depth ∗ aspect ratio) vs. r cri (aspect ratio) with correlation coefficient of 0.69. Equivalent crack size (ECS) models are correspondingly developed with these best correlated parameters for single- and multi-crack initiations, respectively. The pre-corrosion fatigue lives predicted with our models agree well with the experimental results and the maximum error factor is about 1.6. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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