A flexible method for residual stress measurement of spray coated layers by laser made hole drilling and SLM based beam steering

W. Osten; G. Pedrini; P. Weidmann; R. Gadow

doi:10.1117/12.2196869

24 August 2015 A flexible method for residual stress measurement of spray coated layers by laser made hole drilling and SLM based beam steering

W. Osten, G. Pedrini, P. Weidmann, R. Gadow

Author Affiliations +

Proceedings Volume 9660, SPECKLE 2015: VI International Conference on Speckle Metrology; 96600H (2015) https://doi.org/10.1117/12.2196869
Event: SPECKLE 2015: VI International Conference on Speckle Metrology, 2015, Guanajuato, Mexico

Abstract

A minimum invasive but high resolution method for residual stress analysis of ceramic coatings made by thermal spraycoating using a pulsed laser for flexible hole drilling is described. The residual stresses are retrieved by applying the measured surface data for a model-based reconstruction procedure. While the 3D deformations and the profile of the machined area are measured with digital holography, the residual stresses are calculated by FE analysis. To improve the sensitivity of the method, a SLM is applied to control the distribution and the shape of the holes. The paper presents the complete measurement and reconstruction procedure and discusses the advantages and challenges of the new technology.

Citation Download Citation

W. Osten, G. Pedrini, P. Weidmann, and R. Gadow "A flexible method for residual stress measurement of spray coated layers by laser made hole drilling and SLM based beam steering", Proc. SPIE 9660, SPECKLE 2015: VI International Conference on Speckle Metrology, 96600H (24 August 2015); https://doi.org/10.1117/12.2196869

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