Author:

Keywords:

Science & Technology, Technology, Materials Science, Multidisciplinary, Mechanics, Materials Science, Characterization & Testing, Materials Science, Digital image correlation, Uncertainty quantification, Camera rotation, Compensation of shaky cameras, Error assessment, DIGITAL IMAGE CORRELATION, DEFORMATION MEASUREMENTS, UNCERTAINTY, 2D, 0905 Civil Engineering, 0913 Mechanical Engineering, 0915 Interdisciplinary Engineering, Mechanical Engineering & Transports, 4005 Civil engineering, 4017 Mechanical engineering

Abstract:

© 2018, Society for Experimental Mechanics. Camera rotation during stereo digital image correlation (DIC) measurements is always present in some amount and is caused by environmental vibrations during testing (e.g. blast testing, testing in industrial environments, vibration testing Helffrick et al., Mech Syst Signal Process 25(3):917–927, 2011, etc.). The impact of changing extrinsic parameters on stereo-DIC measurements was investigated in this paper by simulating several DIC experiments with a shaking camera system. To obtain an appropriate order of magnitude of the camera motion, the actual camera rotation during a test was observed and reported. The impact hereof was investigated by analyzing static images and by simulating camera rotation with a stereo-DIC simulator presented in Balcaen et al. (Exp Mech 57(5):703–718, 2017). Insight on this underestimated error source is explained by investigating which rotations are more critical to the resulting displacements and strains. Two possible compensation methods were investigated and their capability of compensating camera motion was evaluated.