Stereo-DIC using high magnification infrared and visible cameras

Measurements of kinematic fields are performed with an original combination of two different imaging modalities, (i.e. one IR and one visible camera). Stereo Digital Image Correlation (SDIC) procedures are performed with a global approach [1]. The stereovision system is first calibrated by performing lens distortion corrections [2]. Then the projection model parameters are determined thanks to the CAD (NURBS) representation of the 3D sample surface using an integrated approach. This CAD-based SDIC, offers the possibility to determine the specimen deformation. The simple case of3D rigid translational motions is experimentally tested and validated.

[1]  Stéphane Roux,et al.  One-shot thermal and kinematic field measurements: Infra-Red Image Correlation , 2013 .

[2]  Stéphane Chapuliot,et al.  Crack initiation under thermal fatigue: An overview of CEA experience: Part II (of II): Application of various criteria to biaxial thermal fatigue tests and a first proposal to improve the estimation of the thermal fatigue damage , 2009 .

[3]  B. Beaubier,et al.  CAD-based calibration and shape measurement with stereoDIC , 2014 .

[4]  Stéphane Roux,et al.  Experimental facility for high cycle thermal fatigue tests using laser shocks , 2012 .

[5]  Hubert W. Schreier,et al.  Image Correlation for Shape, Motion and Deformation Measurements: Basic Concepts,Theory and Applications , 2009 .

[6]  Dean Brown,et al.  Decentering distortion of lenses , 1966 .

[7]  Jean-José Orteu,et al.  3-D computer vision in experimental mechanics , 2007 .

[8]  Andrei Constantinescu,et al.  Crack initiation under thermal fatigue: An overview of CEA experience. Part I: Thermal fatigue appears to be more damaging than uniaxial isothermal fatigue , 2009 .

[9]  Stéphane Roux,et al.  Digital Image Correlation , 2012 .

[10]  Stéphane Chapuliot,et al.  A computational lifetime prediction of a thermal shock experiment. Part I: thermomechanical modelling and lifetime prediction , 2006 .

[11]  Duane C. Brown,et al.  Close-Range Camera Calibration , 1971 .

[12]  Stéphane Roux,et al.  Characterization of temperature and strain fields during cyclic laser shocks , 2016 .

[13]  Stéphane Roux,et al.  Characterization of Necking Phenomena in High-Speed Experiments by Using a Single Camera , 2010, EURASIP J. Image Video Process..

[14]  Stéphane Roux,et al.  Integrated Digital Image Correlation for the Evaluation and Correction of Optical Distortions , 2014 .