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Strain in isotropic pin-joints: Experimental and numerical analysis

ConclusionsPhase-stepped Digital Speckle Pattern Interferometry has been effectively used for the determination of displacement and strain distributions for a case of high spatial gradients. Little or no specimen preparation is required. The in-plane displacement map is obtained quickly, and has a spatial resolution of the order of a few pixels in the frame grabber system. The least-square fitting of the displacement data allows for strain calculation with an equivalent gage length of ≈0.1 mm and a repeatability of ≈3 µstrain rms. The experimental data show good agreement with the numerical predictions obtained by a nonlinear contact finite element analysis.