Control of Deviations in Lattice Structures Manufactured by Selective Laser Melting

Sokolova, V.; Kantyukov, Artem

doi:10.4028/www.scientific.net/kem.822.580

Cited by 1 publication

(3 citation statements)

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“…The results are usually average values from several manual measurements, without complex information about the lattice structure morphology. Using 3D optical scanning allows for measuring dimensions with high accuracy (10 −3 mm) [11,12] and, along with proper software tools, it also enables the automation of the data evaluation. However, this approach also has a limitation, in the case of complex geometries.…”

Section: Introductionmentioning

confidence: 99%

“…However, this approach also has a limitation, in the case of complex geometries. The measurement can be performed only at the peripheral parts of the lattice structures; usually, they are not captured fully [11,13]. Computed tomography (CT) is generally used for internal porosity analysis [9,10,14,15]; however, this technology is applicable for strut geometry analysis, as well, as presented in several previous studies [11,16].…”

Section: Introductionmentioning

confidence: 99%

“…The measurement can be performed only at the peripheral parts of the lattice structures; usually, they are not captured fully [11,13]. Computed tomography (CT) is generally used for internal porosity analysis [9,10,14,15]; however, this technology is applicable for strut geometry analysis, as well, as presented in several previous studies [11,16]. The main advantage of the CT approach is the ability to provide dimensional measurements over the whole volume of the complex structure [10].…”

Section: Introductionmentioning

confidence: 99%

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Deviations of the SLM Produced Lattice Structures and Their Influence on Mechanical Properties

et al. 2022

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Selective laser melting (SLM) is an additive manufacturing technology suitable for producing cellular lattice structures using fine metal powder and a laser beam. However, the shape and dimensional deviations occur on the thin struts during manufacturing, influencing the mechanical properties of the structure. There are attempts in the literature to describe the actual shape of the struts’ geometry, however, on a smaller data sample only, and there is a lack of a universal FEA material model applicable to a wider range of lattice structure diameters. To describe the actual dimensions of the struts, a set of lattice structures, with diameters ranging from 0.6 to 3.0 mm, were manufactured using SLM. These samples were digitized using micro-computed tomography (μCT) and fully analyzed for shape and dimensions. The results show large deviations in diameters of inscribed and circumscribed cylinders, indicating an elliptical shape of the struts. With increasing lattice structure diameter, the deviations decreased. In terms of the effect of the shape and dimensions on the mechanical properties, the Gaussian cylinder was found to describe struts in the diameter range of 1.5 to 3.0 mm sufficiently well. For smaller diameters, it is appropriate to represent the actual cross-section by an ellipse. The use of substitute ellipses, in combination with the compression test results, has resulted in FEA material model that can be used for the 0.6 to 3.0 mm struts’ diameter range. The model has fixed Young’s and tangential modules for these diameters and is controlled only by the yield strength parameter (YST).

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Section: Introductionmentioning

confidence: 99%