Frequency domain measurements of melt pool recoil pressure using modal analysis and prospects for in-situ non-destructive testing

Tristan Cullom, Nicholas Altese, Douglas Bristow, Robert Landers, Ben Brown, Troy Hartwig, David Soine, Aimee Allen, Andrew Barnard, Jason Blough, Kevin Johnson, Edward Kinzel

Research output: Contribution to conferencePaperpeer-review

Abstract

Fielding Additively Manufactured (AM) parts requires evaluating both the part’s geometry and material state. This includes geometry that may be optically hidden. Both the geometry and material state affect the vibration response of the parts and modal analysis (identifying natural frequencies) has been shown to be effective for at least simple geometries using ex-situ methods (shaker table and impact hammer excitations). This paper investigates evaluation of the frequency response of metal parts inside the build chamber using the process laser to excite the parts during printing (Renishaw AM250). Vibrations in the part are measured with accelerometers connected to the build plates and used to track the response during printing as during pauses between layers. The laser is modulated at different frequencies and focused onto specific targets to precisely extract the response from individual parts on the build plate. These results are compared to numerical models for metal parts of different geometries and with different material states. This work was funded by the Department of Energy’s Kansas City National Security Campus which is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.

Original languageEnglish (US)
Pages1430-1444
Number of pages15
StatePublished - 2019
Event30th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2019 - Austin, United States
Duration: Aug 12 2019Aug 14 2019

Conference

Conference30th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2019
Country/TerritoryUnited States
CityAustin
Period8/12/198/14/19

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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