Fatigue Damage of Additively-Manufactured Metallic Materials
A special issue of Metals (ISSN 2075-4701).
Deadline for manuscript submissions: closed (30 September 2018) | Viewed by 28412
Special Issue Editor
Interests: mechanics of materials; fatigue of metal; machine design; additive manufacturing
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
Additive Manufacturing (AM), sometimes colloquially termed 3D-printing, comprises net-shape production technologies that build a solid object from the sequential superposition of layers representing the cross-sections obtained by virtually slicing the 3D model of the component. Nowadays, AM is becoming a key enabling technology for direct fabrication of functional or structural end-use products and is already revolutionizing, not only the way we produce, but also the design guidelines.
Since 1990, several AM technologies have been developed to sinter metallic powders. They can be distinguished regarding the way in which the layers of material are deposited and consolidated. In powder bed fusion processes, the powder is spread to a controlled thickness over the build platform or the previously built layers. After powder consolidation, the build platform is lowered and a new layer is spread. The process repeats until the entire model is created. Different heat sources are used to sinter or fuse the powder. For instance, a laser or an electron beam is adopted in Selective Laser Melting (SLM)/Selective Laser Sintering (SLS)/Direct Metal Laser Sintering (DMLS) or Electron Beam Melting (EBM), respectively. In all cases, the heat input is intense and highly localized so that the process parameters must be carefully tuned, especially in terms of scan speed, pattern and energy density.
Typically, additively manufactured metallic components show characteristic cast structure, with high superficial roughness, porosity, heterogeneous microstructure, and residual stresses, which negatively affect the mechanical properties, especially the fatigue strength. Therefore, there is an increasing acknowledgement in the engineering community that special care must be taken to understand how AM affects the fatigue properties, the way they can be enhanced and how the design guidelines must be updated in view of this innovative fabrication route.
The aim of this Special Issue is to collect papers aimed at investigating the fatigue damage of additively manufactured metallic material, with special emphasis on understanding and deploying physics of fatigue, advancing experimental and theoretical failure analysis, and structural design that accounts for scale, microstructural, and environmental effects.
Prof. Matteo Benedetti
Guest Editor
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Keywords
- Additive manufacturing
- Selective laser melting
- Electron beam melting
- Fatigue
- Crack growth
- Design
- Defects
- Residual stresses
- Fabrication process optimization.
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