A three-dimensional finite element analysis of temperature field during laser melting of metal powders in additive layer manufacturing

Roberts, I A, Wang, C J, Esterlein, R, Stanford, M and Mynors, D J (2009) A three-dimensional finite element analysis of temperature field during laser melting of metal powders in additive layer manufacturing. International Journal of Machine Tools and Manufacture, 49 (12-13). pp. 916-923. ISSN 0890-6955

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Abstract

Simulating the transient temperature field in additive layer manufacturing (ALM) processes has presented a challenge to many researchers in the field. The transient temperature history is vital for determining the thermal stress distribution and residual stress states in ALM-processed parts that utilise a moving laser heat source. The modelling of the problem involving multiple layers is equally of great importance because the thermal interactions of successive layers affect the temperature gradients, which govern the heat transfer and thermal stress development mechanisms. This paper uses an innovative simulation technique known as element birth and death, in modelling the three-dimensional temperature field in multiple layers in a powder bed. The results indicate that the heated regions undergo rapid thermal cycles that could be associated with commensurate thermal stress cycles. Deposition of successive layers and subsequent laser scanning produces temperature spikes in previous layers. The resultant effect is a steady temperature build-up in the lower layers as the number of layers increases

Item Type: Article
Keywords: Multilayer; Additive layer manufacturing; Element birth and death; Laser melting
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > T Technology (General) > T0055.4 Industrial engineering. Management engineering
T Technology > T Technology (General) > T0055.4 Industrial engineering. Management engineering > T0058.7 Production capacity. Manufacturing capacity
Depositing User: Diane Mynors
Date Deposited: 03 Dec 2012 09:32
Last Modified: 07 Mar 2017 19:09
URI: http://sro.sussex.ac.uk/id/eprint/43241

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