Boundary conditions for simulation of powder bed fusion for metallic glass formation
measurements and calibrations
Document identifier: oai:DiVA.org:ltu-77936
Keyword: Engineering and Technology,
Mechanical Engineering,
Applied Mechanics,
Teknik och teknologier,
Maskinteknik,
Teknisk mekanik,
Computational Methods,
Additive Manufacturing,
Thermal Simulation,
Bulk Metallic Glass,
Solid Mechanics,
HållfasthetsläraPublication year: 2019Relevant Sustainable Development Goals (SDGs):
The SDG label(s) above have been assigned by OSDG.aiAbstract: A finite element model for prediction of the temperature field in the powder bed fusion process is presented and compared to measurements. Accurate temperature predictions at the base plate are essential to accurately predict the formation of crystals in a metallic glass forming material. The temperature measurements were performed by equipping the base plate with thermocouples during manufacturing of a cylinder with the glass forming alloy AMZ4. Boundary conditions for heat losses through the base plate/machine contact interfaces was calibrated to fit the measurements. Additional heat losses was used to account for radiation at the top surface and conduction through the powder bed. An interface boundary condition based on conservation of heat flux was examined to match the heat flow to the machine structure and the temperature predictions was satisfying. Still, temperature predictions with a constant heat transfer coefficient matched the measurements within 1.5oC during the entire building process of about 9 hours.
Authors
J. Lindwall
Luleå tekniska universitet; Material- och solidmekanik
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C.-J. Hassila
Department of Physics and Astronomy - Ångström Laboratory Uppsala University, Box 516, 751 20 Uppsala, Sweden
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J. J. Marattukalam
Department of Engineering Science - Ångström Laboratory Uppsala University, Box 534, 75121, Uppsala, Sweden
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A. Lundbäck
Luleå tekniska universitet; Material- och solidmekanik
Other publications
>>
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identifier: oai:DiVA.org:ltu-77936
datestamp: 2021-04-19T12:54:46Z
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titleInfo:
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lang: eng
title: Boundary conditions for simulation of powder bed fusion for metallic glass formation
subTitle: measurements and calibrations
abstract: A finite element model for prediction of the temperature field in the powder bed fusion process is presented and compared to measurements. Accurate temperature predictions at the base plate are essential to accurately predict the formation of crystals in a metallic glass forming material. The temperature measurements were performed by equipping the base plate with thermocouples during manufacturing of a cylinder with the glass forming alloy AMZ4. Boundary conditions for heat losses through the base plate/machine contact interfaces was calibrated to fit the measurements. Additional heat losses was used to account for radiation at the top surface and conduction through the powder bed. An interface boundary condition based on conservation of heat flux was examined to match the heat flow to the machine structure and the temperature predictions was satisfying. Still temperature predictions with a constant heat transfer coefficient matched the measurements within 1.5oC during the entire building process of about 9 hours.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Engineering and Technology
Mechanical Engineering
Applied Mechanics
@attributes:
lang: swe
authority: uka.se
topic:
Teknik och teknologier
Maskinteknik
Teknisk mekanik
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lang: eng
topic: Computational Methods
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lang: eng
topic: Additive Manufacturing
@attributes:
lang: eng
topic: Thermal Simulation
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lang: eng
topic: Bulk Metallic Glass
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lang: eng
authority: ltu
topic: Solid Mechanics
genre: Research subject
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lang: swe
authority: ltu
topic: Hållfasthetslära
genre: Research subject
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languageTerm: eng
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conference/other
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Published
4
ISBN för värdpublikation: 978-84-949194-8-0
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J.
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Luleå tekniska universitet
Material- och solidmekanik
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Hassila
C.-J.
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affiliation: Department of Physics and Astronomy - Ångström Laboratory Uppsala University Box 516 751 20 Uppsala Sweden
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Marattukalam
J. J.
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affiliation: Department of Engineering Science - Ångström Laboratory Uppsala University Box 534 75121 Uppsala Sweden
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Material- och solidmekanik
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titleInfo:
title: II International Conference on Simulation for Additive Manufacturing
subTitle: Sim-AM 2019
part:
extent:
start: 51
end: 59
originInfo:
dateIssued: 2019
publisher: International Center for Numerical Methods in Engineering (CIMNE)
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url: https://congress.cimne.com/sim-am2019/frontal/doc/EbookSim-AM2019.pdf
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