Reducing residual stresses and deformations in selective laser melting through multi-level multi-scale optimization of cellular scanning strategy

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Abstract

Residual stresses and deformations continue to remain one of the primary challenges towards expanding the scope of selective laser melting as an industrial scale manufacturing process. While process monitoring and feedback-based process control of the process has shown significant potential, there is still dearth of techniques to tackle the issue. Numerical modelling of selective laser melting process has thus been an active area of research in the last few years. However, large computational resource requirements have slowed the usage of these models for optimizing the process.In this paper, a calibrated, fast, multiscale thermal model coupled with a 3D finite element mechanical model is used to simulate residual stress formation and deformations during selective laser melting. The resulting reduction in thermal model computation time allows evolutionary algorithm-based optimization of the process. A multilevel optimization strategy is adopted using a customized genetic algorithm developed for optimizing cellular scanning strategy for selective laser melting, with an objective of reducing residual stresses and deformations. The resulting thermo-mechanically optimized cellular scanning strategies are compared with standard scanning strategies and have been used to manufacture standard samples. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageEnglish
Title of host publicationProceedings of SPIE
EditorsBo Gu, Henry Helvajian, Alberto Piqué
Number of pages12
Volume9738
PublisherSPIE - International Society for Optical Engineering
Publication date2016
Article number97380Z
DOIs
Publication statusPublished - 2016
EventLaser 3D Manufacturing III - San Francisco, California, United States
Duration: 13 Feb 201613 Feb 2016

Conference

ConferenceLaser 3D Manufacturing III
CountryUnited States
CitySan Francisco, California
Period13/02/201613/02/2016
SeriesS P I E - International Society for Optical Engineering. Proceedings
Number97380Z
Volume 9738
ISSN0277-786X

Keywords

  • Selective laser melting
  • Optimized scan strategies
  • Multiscale hybrid pseudoanalytical-3DADI modelling
  • Thermo-mechanical analysis
  • Multilevel optimization

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