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Überwachung einer laserbasierten Wärmebehandlung mittels digitaler Speckle‐Fotografie
Author(s) -
Kamau E. N.,
Sakkiettibutra J.,
Falldorf C.,
Mundt J.,
Kopylow C. v.
Publication year - 2012
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100900
Subject(s) - speckle pattern , laser , optics , materials science , glazing , residual stress , digital signal processing , acoustics , mechanical engineering , engineering , electronic engineering , physics , composite material
In the current study displacements of a single angled tooth (helical gear, steel EN 20MnCr5) were measured with sub‐pixel accuracy by means of Digital Speckle Photography (DSP). The main aim was to assess the in‐process performance of DSP while measuring three dimensional deformations in a laser based heat treatment process. This task dictated the integration of DSP as a non‐invasive experimental method, which is insensitive to different interfering effects, e. g. vibrations and varying coefficients of refraction, into the heat treatment setup. The results attained were compared with data from laser triangulation measurements and FEM‐based temperature simulations and were found to show good agreement within the limitations of these methods. Knowledge of deformations of the component during the laser beam based heat treatment process allows an analysis of the effects of residual stress fields generated with a high power laser. This analysis aims at minimisation of unwanted distortions resulting from hardening heat treatment.