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Numerical modelling of parts distortion and beam supports breakage during selective laser melting (SLM) additive manufacturing

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Abstract

The Selective Laser Melting (SLM) process has been progressively endorsed as an industrial manufacturing technique to produce high value-added components. However, one of the main obstacles to its wide application is the uncertainty regarding the successful completion of the manufacturing process. Mechanical stresses are generated and accumulated during the process, which may lead to the parts warping and cracking. Support structures may also detach from the part but it is not certain that these cracks conduct to the manufacturing failure. The process simulations currently available do not consider the cracking of the supports and the ongoing part’s deflection. The aim of this study is to investigate cone supports fracture behaviour comparing the results from a numerical model and the manufacturing of an industrial part. A model using 1D-beam elements to mesh the supports has been developed to consider the damage of the supports, their breakage and the ongoing deflection. Some numerical convergence issues are identified and solutions are proposed. Specific experimental set-ups are developed to characterise the behaviour of the supports individually and as a group. Significant improvements are denoted while injecting the measured characteristics within the model. Some key parameters of the supports damage behaviour are identified. It is shown that the supports mechanical characteristics are significantly different from the parts due to their manufacturing conditions and environment. Also, limitations regarding the characterisation of the supports as well as strong numerical convergence issues brought by multiple supports cracking are discussed.

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Y. Bresson: Software, Methodology, Writing-Original draft preparation. A. Tongne: Software, Methodology, Writing-Reviewing and Editing. P. Selva: Experiments, Methodology, Writing-Reviewing and Editing. L. Arnaud: Supervision, Methodology, Writing-Reviewing and Editing.

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  1. Laboratoire Génie de Production, INP-ENIT, 47 Avenue d’Azereix, Tarbes, 65000, France

    Yves Bresson, Amèvi Tongne, Pierre Selva & Lionel Arnaud

  2. Halbronn, Z.I. Lognes, rue des Campanules, Marne-La-Vallée, 77437, France

    Yves Bresson

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  1. Yves Bresson
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Partial financial support was received from Halbronn company (salary of the PhD, CIFRE, and financial contract with the laboratory, with the funding of the French funding agency ANRT).

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Correspondence to Yves Bresson.

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Highlights

• Finite element modelling of cone supports and specifically the teeth area.

• Support breakage simulation and part’s distortion after supports breakages.

• Model results are compared to four additive manufacturing commercial software.

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Bresson, Y., Tongne, A., Selva, P. et al. Numerical modelling of parts distortion and beam supports breakage during selective laser melting (SLM) additive manufacturing. Int J Adv Manuf Technol 119, 5727–5742 (2022). https://doi.org/10.1007/s00170-021-08501-5

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  • DOI: https://doi.org/10.1007/s00170-021-08501-5

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