An Analytical Method for Predicting Residual Stress Distribution in Selective Laser Melted/Sintered Alloys

An Analytical Method for Predicting Residual Stress Distribution in Selective Laser Melted/Sintered Alloys

D. Boruah, X. Zhang, M. Doré

Abstract. Residual stresses that build up during selective laser melting or sintering (SLM/SLS) process can influence the dimensional accuracy, mechanical properties and in-service performance of SLM/SLS parts. Therefore, it is crucial to understand, predict and effectively control residual stresses in a part. The present study aims at developing an analytical model to predict the through-thickness distribution of residual stresses in an SLM part-substrate system. The proposed model demonstrates how residual stresses built up in the substrate and previously deposited layers are related to the stress induced by a newly deposited layer, based on the stress and moment equilibrium requirements. The model has been validated by published experimental measurements and verified with existing analytical/numerical models. The outcomes of the study suggest that the proposed analytical model can be used for quick estimation of residual stress distribution and the order of magnitude.

Keywords
Residual Stress, Modelling, Selective Laser Melting, Additive Manufacturing

Published online 9/11/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: D. Boruah, X. Zhang, M. Doré, ‘An Analytical Method for Predicting Residual Stress Distribution in Selective Laser Melted/Sintered Alloys’, Materials Research Proceedings, Vol. 6, pp 283-288, 2018

DOI: https://dx.doi.org/10.21741/9781945291890-45

The article was published as article 45 of the book Residual Stresses 2018

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] P. Mercelis, et al., Residual stresses in selective laser sintering and selective laser melting, Rapid Prototyp. J. 12 (2006) 254–265. https://doi.org/10.1108/13552540610707013
[2] J.P. Kruth, et al., Binding mechanisms in selective laser sintering and selective laser melting, Rapid Prototyp. J. 11 (2005) 26–36. https://doi.org/10.1108/13552540510573365
[3] J.P. Kruth, et al., Assessing and comparing influencing factors of residual stresses in selective laser melting using a novel analysis method, Proc. Inst. Mech. Eng. Part B J. Eng. Manuf. 226 (2012) 980–991. https://doi.org/10.1177/0954405412437085
[4] C. Li, et al., Prediction of residual stress and part distortion in selective laser melting, Procedia CIRP. 45 (2016) 171–174. https://doi.org/10.1016/j.procir.2016.02.058
[5] M. Shiomi, et al., Residual stress within metallic model made by selective laser melting process, CIRP Ann. – Manuf. Technol. 53 (2004) 195–198. https://doi.org/10.1016/S0007-8506(07)60677-5