Sina Baier's research while affiliated with Technical University of Denmark and other places

Publications (6)

Conference Paper
Full-text available
An increasing number of industrial sectors are considering the potential of additive manufacturing as an asset to improve their production. Indeed, additive manufacturing enables the fabrication of very complex geometries and inner cavities that cannot be manufactured with conventional techniques. However, in critical sectors such as aerospace, def...
Article
The increasingly complex shapes and geometries being produced using additive manufacturing necessitate new characterization techniques that can address the corresponding challenges. Standard techniques for roughness and texture measurements are inept at characterizing the internal surfaces in freeform geometries. Hence, this work presents a new met...
Conference Paper
Full-text available
Increasingly advanced shapes and geometries are being manufactured using additive manufacturing and new characterization techniques must emerge in order to fully utilize the new possibilities given by freeform design. Cooling channels produced by the laser powder bed fusion process has been shown to have high roughness at overhanging areas due to p...
Conference Paper
Full-text available
Metal additive manufacturing has the potential to enhance the performance of engineering applications by utilizing its inherent design freedom to create complex geometries such as required for conformal cooling. However, additively manufactured channels show significant form deviations when made by laser powder bed fusion. Thereby, not only process...
Conference Paper
Full-text available
Conformal cooling channels are becoming one of the next big steps in the fabrication of moulds and tools. Mass flow rate and heat transfer are affected by the surface roughness in the cooling channels. The freeform shape of conformal cooling channels makes it difficult to evaluate the internal roughness with respect to classic planar techniques. Th...
Conference Paper
A standard mold is equipped with additively manufactured inserts in a rectangular shape produced with vat photo polymerization. While the lifetime compared to conventional materials such as brass, steel, and aluminum is reduced, the prototyping and design phase can be shortened significantly by using flexible and cost-effective additive manufacturi...

Citations

... En los últimos años, diferentes grupos de investigación han propuesto varios patrones de referencia para tomografía computarizada [2]. Las geometrías más comunes en estos patrones son esferas y cilindros [3,4,5], representando respectivamente puntos y líneas. ...
... In fact, microCT has been found to be an especially well-suited evaluation method for complex parts produced using AM [29][30][31][32]. In addition to routine porosity and defect inspection, this method has been employed in assessing part geometric accuracy, surface characterization [33,34], and corrosion evaluation [35]. ...
... Moreover, depending on the application, dross-formations and accompanying rough surfaces can be preferable for heat transfer [40]. Therefore, simple diameter compensation of circular channels could also be considered as an alternative approach to counteract form deviations [41]. For the D nominal =2 mm channels in the present study, a maximum reduction of the cross-sectional area of only 4.6 % for LPBF-1 and a moderate 16.1 % for LPBF-2 was determined. ...
... Measurements of Pa and D eq for channels were described in recent work by Klingaa et al. [23]. An in-house Python code, developed by Klingaa et al. for the quantitative analysis of X-ray CT scanned channels, was used for the quality metric calculations [24,25]. The tool uses cross-sectional images of channels to perform automated quantitative evaluations. ...
... [7]) indicate that the choice of fiber material significantly influences the thermal conductivity of the final material. Challenges in the fiber-matrix interface as mentioned in [2] as well as fiber orientation [8,9], which also influences the crack propagation, will need to be accounted for. ...