Modeling the selective laser melting of polylactide composite materials

Morsbach, Christian; Höges, Simon

doi:10.2351/1.3538944

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…Throughout the first stage ( HS < 100 µm), A instant had a gradual increase from 0.199 to 0.260 alongside the increase of hatch distance from 50 μm to 100 μm. A similar result was observed in experimental investigations [ 29 , 30 , 31 ]. In the second stage ( HS ≥ 100 µm), although the hatch space increases from 100 μm to 120 μm, A instant keeps basically constant (a slight increase from 0.260 to 0.264).…”

Section: Resultssupporting

confidence: 91%

“…However, many studies ignore the effect of material state and phase changes on laser absorption when modelling the interaction between laser beam and materials, and consider the absorptance as constant. However, the real fact is that the laser energy is absorbed by material in multiple states [ 4 ], namely powder, liquid, and solid as shown in Figure 1 , and the absorptance varies according to the time of laser radiation and process parameters, such as scanning velocity, hatch space, and laser power in the PBF process [ 28 , 29 , 30 , 31 ]. This can be further clarified as a fact that the surface area of the liquid, solidified, and powder material covered by the laser spot change with the time of laser radiation and the process parameters mentioned above.…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Analysis of Interaction of Laser Beam with Material in Laser Metal Powder Bed Fusion Process

Zhang

et al. 2018

Materials

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A deep understanding of the laser-material interaction mechanism, characterized by laser absorption, is very important in simulating the laser metal powder bed fusion (PBF) process. This is because the laser absorption of material affects the temperature distribution, which influences the thermal stress development and the final quality of parts. In this paper, a three-dimensional finite element analysis model of heat transfer taking into account the effect of material state and phase changes on laser absorption is presented to gain insight into the absorption mechanism, and the evolution of instantaneous absorptance in the laser metal PBF process. The results showed that the instantaneous absorptance was significantly affected by the time of laser radiation, as well as process parameters, such as hatch space, scanning velocity, and laser power, which were consistent with the experiment-based findings. The applicability of this model to temperature simulation was demonstrated by a comparative study, wherein the peak temperature in fusion process was simulated in two scenarios, with and without considering the effect of material state and phase changes on laser absorption, and the simulated results in the two scenarios were then compared with experimental data respectively.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Interaction of Laser Beam with Material in Laser Metal Powder Bed Fusion Process

Zhang

et al. 2018

Materials

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“…Selective laser melting (SLM), as a newly developed direct digital manufacturing technology, has been treated as one of the most effective powder-based additive manufacturing (AM) methods for metal parts. [10][11][12][13][14][15][16][17] During SLM process, the 3D parts are built by selectively fusing and consolidation of the thin layers of powder using the high-energy laser beam in a layer-by-layer manner according to the computeraided design (CAD) models of the parts. Because of the unique processing mechanisms of SLM, e.g., a full melting of powder materials followed by a rapid solidification at a rate up to10 6 -10 8 K/s, 18 the molten materials tend to experience a particular nonequilibrium metallurgical process during SLM processing, thereby providing a capacity to produce unique aluminum-based nanocomposite parts.…”

Section: Journal Of Laser Applications Laser Additive Manufacturing Fmentioning

confidence: 99%

Densification behavior, microstructure evolution, and wear property of TiC nanoparticle reinforced AlSi10Mg bulk-form nanocomposites prepared by selective laser melting

Wang

Dai

et al. 2014

Journal of Laser Applications

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Selective laser melting (SLM), due to its unique additive manufacturing processing philosophy, demonstrates a high potential in producing bulk-form nanocomposites with novel nanostructures and enhanced properties. In this study, the nanoscale TiC particle reinforced AlSi10Mg nanocomposite parts were produced by SLM process. The influence of “laser energy per unit length” (LEPUL) on densification behavior, microstructural evolution, and wear property of SLM-processed nanocomposites was studied. It showed that using an insufficient LEPUL of 250 J/m lowered the SLM densification due to the balling effect and the formation of residual pores. The highest densification level (>98% theoretical density) was achieved for SLM-processed parts processed at the LEPUL of 700 J/m. The TiC reinforcement in SLM-processed parts experienced a structural change from the standard nanoscale particle morphology (the average size 75–92 nm) to the relatively coarsened submicron structure (the mean particle size 161 nm) as the applied LEPUL increased. The nanostructured TiC reinforcement was generally maintained within a wide range of LEPUL from 250 to 700 J/m and the dispersion state of nanoscale TiC reinforcement was homogenized with increasing LEPUL. The sufficiently high densification rate combined with the uniform distribution of nanoscale TiC reinforcement throughout the matrix led to the considerably low coefficient of friction of 0.38 and wear rate of 2.76 × 10−5 mm3 N−1 m−1 for SLM-processed nanocomposites at 700 J/m. Both the insufficient SLM densification response at a relatively low LEPUL of 250 J/m and the disappearance of nanoscale reinforcement at a high LEPUL of 1000 J/m lowered the wear performance of SLM-processed nanocomposite parts.

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“…If the laser is considered as a volumetric source, the intensity of the heat source is assumed to satisfy the Beer-Lambert law [8]…”

Section: -2mentioning

confidence: 99%

Point, surface and volumetric heat sources in the thermal modelling of selective laser melting

Yang

Ayas

2017

AIP Conference Proceedings

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Selective laser melting (SLM) is a powder based additive manufacturing technique suitable for producing high precision metal parts. However, distortions and residual stresses within products arise during SLM because of the high temperature gradients created by the laser heating. Residual stresses limit the load resistance of the product and may even lead to fracture during the built process. It is therefore of paramount importance to predict the level of part distortion and residual stress as a function of SLM process parameters which requires a reliable thermal modelling of the SLM process. Consequently, a key question arises which is how to describe the laser source appropriately. Reasonable simplification of the laser representation is crucial for the computational efficiency of the thermal model of the SLM process. In this paper, first a semi-analytical thermal modelling approach is described. Subsequently, the laser heating is modelled using point, surface and volumetric sources, in order to compare the influence of different laser source geometries on the thermal history prediction of the thermal model. The present work provides guidelines on appropriate representation of the laser source in the thermal modelling of the SLM process.

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Modeling the selective laser melting of polylactide composite materials

Cited by 9 publications

References 13 publications

Finite Element Analysis of Interaction of Laser Beam with Material in Laser Metal Powder Bed Fusion Process

Finite Element Analysis of Interaction of Laser Beam with Material in Laser Metal Powder Bed Fusion Process

Densification behavior, microstructure evolution, and wear property of TiC nanoparticle reinforced AlSi10Mg bulk-form nanocomposites prepared by selective laser melting

Point, surface and volumetric heat sources in the thermal modelling of selective laser melting

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