33. Regularization Techniques for Finite Element DIC

To compensate bad quality of speckles pattern or on increase the spacial resolution by decreasing the element size, finite based DIC often requires a additional regularization. Usually the regularization introduce a cut-off length below which the wave length of the measured displacement are filtered. While this might improve the measurement for low frequency displacement to be measure, discontinuities are artificially smoothed what may be detrimental for the analysis of cracks. To circumvent this drawback, a new regularization strategy using the median filter during the optimization process is proposed and compared with the other classical regularizations on perfect discontinuity in order to illustrate the effect of regularization on crack.