Fatigue Analysis of Casting Defects
A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".
Deadline for manuscript submissions: 20 July 2024 | Viewed by 171
Special Issue Editor
Interests: crack closure effect on fatigue crack propagation threshold; effect of stress triaxiality on hydrogen embrittlement; fatigue from casting defects; innovative heat treatments of aluminium casting alloys; Portevin le chatelier effect; serrated yielding in light alloys; stress corrosion cracking of bridge steels
Special Issue Information
Dear Colleagues,
The fatigue resistance of structural components is strongly sensitive to casting details such as casting technology and underlying cooling rate, geometry of the component, fluid dynamics of mold-filling, inoculation, etc. All these aspects induce typical defects and microstructural gradients which makes the fatigue resistance of casting components lower than those obtained in components produced by wrought alloys. In casting, solidification defects such as porosity and microstructural alterations such as exploded graphite nodules in ductile iron are difficult to avoid. These anomalies are responsible for the lowering of the fatigue strength of components.
The initiation event is critical for fatigue strength. Fatigue initiation points are found with casting defects, typically gas pores, microshrinkage, oxide skins, defective microstructures, etc. Defects of a sufficient size act as pre-existing microcracks that, under service load, can develop into a component failure. In contrast, small defects may behave as non-propagating and thus are irrelevant to fatigue failure.
Important scientific advancements would come from studying the quantitative role of defects on fatigue initiation in castings. One possible approach is to adapt Murakami's theory to the case of castings, discriminating defects according to their morphology, their position in the component, as well as their size. The specific role of the material type must also be investigated. Another important aspect to be developed is the evaluation of statistical dispersion in fatigue strength induced by casting defects, again differentiating the specific effect, depending on the type of defect.
Dr. Roberto Doglione
Guest Editor
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Keywords
- fatigue initiation
- gas pores
- microshrinkage pores
- oxyde skins
- defective microstructures
- Murakami's approach
- fatigue resistance scatter
