期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 225, 期 -, 页码 326-336出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2015.04.030
关键词
Laser; Sintering; Polymers; Simulation; Powder
资金
- French Ministry of Economy (Direction of Competitiveness and Services)
- French Ministry of Industry (Direction of Competitiveness and Services)
- French Ministry of employment (Direction of Competitiveness and Services)
A dual experimental-numerical approach was carried out to estimate thermal cycles and resulting fusion depths obtained during the selective laser sintering (SLS) of two polymers: PA12 and PEKK. The validation of thermal cycles was obtained by considering fusion depths on single layers for different experimental conditions and temperature measurements with IR thermal camera. It was shown that a simple Beer-Lambert's heat deposit equation incorporating an extinction coefficient determined experimentally and an efficiency ratio including both laser absorption and diffusion in the powder bed were sufficient for determining accurately fusion depths, and heat cycles for the two polymers. This allowed determining optimum process conditions for manufacturing additive layers on a specifically-designed SLS set-up. (C) 2015 Elsevier B.V. All rights reserved.
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