Comparison between process simulation and deformation measured by defocused speckle photography

Joel Wahl; Per Gren; Per Bergström; Torbjörn Lindbäck; Malin Magnusson; Kristina Domeij; Mikael Sjödahl

doi:10.1117/12.2319384

7 September 2018 Comparison between process simulation and deformation measured by defocused speckle photography

Joel Wahl, Per Gren, Per Bergström, Torbjörn Lindbäck, Malin Magnusson, Kristina Domeij, Mikael Sjödahl

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108341K (2018) https://doi.org/10.1117/12.2319384
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

Defocused laser speckle photography is used as a tool to measure the heat responses in a titanium component during laser heating. The evolution of the response is compared with a set of preprocessed Finite Element Simulations of the corresponding process with the aim to verify the simulation model and to find the simulation settings that best resemble the experimental results. The titanium component consists of a 300 x 100 mm₂ substrate of thickness 3.2 mm on which a 200 x 30 x 11 mm³ ridge is built up using the laser metal deposition by wire process. The component is heated on the top of the ridge by a 300 W laser for 10 s and the deformation of the subtrate is followed throughout the heating-cooling cycle. The simulated deformation gradient is shown to resemble the measured response, and the magnitude of the response indicates that about 70 % of the laser power transferres into heat in the metal.

Citation Download Citation

Joel Wahl, Per Gren, Per Bergström, Torbjörn Lindbäck, Malin Magnusson, Kristina Domeij, and Mikael Sjödahl "Comparison between process simulation and deformation measured by defocused speckle photography", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108341K (7 September 2018); https://doi.org/10.1117/12.2319384

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KEYWORDS

Speckle

Sensors

Optical simulations

Photography

Metals

Laser processing

Speckle interferometry

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