Isothermal fatigue damage mechanisms at ambient and elevated temperature of a cast Al-Si-Cu aluminium alloy
| Autor: | Sébastien Bergamo, Thierry Palin-Luc, Nicolas Saintier, Pablo Wilson |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Population chemistry.chemical_element Industrial and Manufacturing Engineering Isothermal process Aluminium Aluminium alloy General Materials Science Composite material Casting defects education Tomography Eutectic system High temperature testing education.field_of_study Physique Mechanical Engineering Fracture mechanics Low-cycle fatigue Paris' law Aluminum alloys chemistry Mechanics of Materials Modeling and Simulation visual_art visual_art.visual_art_medium Castability |
| Zdroj: | International Journal of Fatigue. 121:112-123 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2018.11.016 |
| Popis: | Cast aluminium alloys have a key position as structural materials for the automotive industry combining good mechanical performance, excellent castability and thermal conductivity, making them a suitable choice for engine parts such as cylinder heads. In this paper, the low-cycle fatigue behaviour of a cast aluminium alloys is investigated at ambient and elevated temperatures by the use of in situ optical surface crack monitoring, secondary electron microscopy and X-ray tomography which are combined to study the fatigue mechanisms. The observations highlight the effect of defect distribution and temperature on the crack propagation path and in particular the change of the role of eutectic regions as the temperature increases. In addition, based on the defects population analyses by tomography, a fatigue crack initiation model is proposed to consider both temperature and defect effects on the total low-cycle fatigue life and fatigue crack growth rates. a Arts et Metiers ParisTech, I2M bordeaux, CNRS, Esplanade des Arts et Metiers, 33405 Talence, France b Renault S.A.S, 1 avenue du Golf, 78280 Guyancourt, France |
| Databáze: | OpenAIRE |
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