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Back to Laser Sintered Parts with Isotropic Mechanical Properties
Laser Sintered Parts with Isotropic Mechanical Properties
Author/Editor:
Andreas A Wegner, Gerd Witt
Description
Back to Laser Sintered Parts with Isotropic Mechanical Properties
In general, laser sintered parts have an explicit anisotropy of mechanical properties. Due to the layer-wise production, parts show no homogenous morphological structure as known from injection molded parts. Voids appear within the part and are concentrated in the area between two consecutive layers, resulting in reduced bonding. Therefore, mechanical properties and, in particular, elongation at break show significantly lower values in the direction of build compared to the properties within the build plane. Sometimes these effects are an obstacle in the use of laser sintering for series production of parts.
The aim of the research done was to identify the main influencing factors on the anisotropy of mechanical properties in laser sintering and to understand the correlation between mechanical properties and parameter settings. Therefore, parameters with a significant effect on the mechanical properties were chosen for an experimental design to analyze these influences. The observed correlations were used to set up new parameter sets, resulting in a significant reduction of anisotropy.
Presented at: Rapid 2012 and 3D Imaging Conferences & Exposition, Society of Manufacturing Engineers, May 22-25, 2012, Atlanta, Georgia.
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