Evaluation of metal lattice structures with x-ray micro-computed tomography: Dimensional accuracy and manufacturability

Tuomas Puttonen*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Additive manufacturing enables product designers to incorporate complexity onto their designs on multiple size scales. Computer-Aided design methods, such as topology optimization and lattice design, have emerged as software tools for applications where part consolidation and weight reduction are desired. Still, a more delicate control of hierarchical complexity and submillimeter-sized features would unlock a widely unexplored frontier of new design possibilities. However, the complexity of a design can respectively affect the manufacturing process. In powder bed fusion, the diameter, power and speed of the laser spot and the resulting size of the melt pool define the attainable feature resolution and accuracy in comparison with the original design intent. X-ray computed tomography can be a useful tool in validation and provide a detailed, volumetric representation of a part with internal features. This paper examines the design accuracy of 316L metal lattice structures and density of solid cubes with industrial X-ray micro-computed tomography. Accessible tools with open source software are presented for CT data analysis. The nominal values are compared against the as-built and CT scanned samples for surface area, volume, and dimensional accuracy. A CT voxel size of 30 40 ?m allows to identify printability issues and general trends in the part density in comparison to the geometry changes. However, a finer voxel size in the submicron range would be required to properly detect and localize internal porosity and evaluate surface topography..

Original languageEnglish
Title of host publicationDesign, Systems, and Complexity
PublisherThe American Society of Mechanical Engineers (ASME)
Number of pages8
ISBN (Electronic)9780791884539
DOIs
Publication statusE-pub ahead of print - 16 Feb 2021
MoE publication typeA4 Article in a conference publication
EventASME International Mechanical Engineering Congress and Exposition - Virtual, Online
Duration: 16 Nov 202019 Nov 2020

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume6

Conference

ConferenceASME International Mechanical Engineering Congress and Exposition
Abbreviated titleIMECE
CityVirtual, Online
Period16/11/202019/11/2020

Keywords

  • Additive Manufacturing
  • Design for Additive Manufacturing
  • Micro-Computed Tomography
  • Nondestructive Testing
  • Powder Bed Fusion
  • Selective Laser Melting

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