DEFORMATION DISTRIBUTION DURING MECHANICAL TESTS OF CYLINDRICAL STEEL ROD USING DIGITAL IMAGE CORRELATION

This paper presents in situ investigations of the deformation field distribution during compression of cylindrical steel rods at meso and macroscale levels using digital image correlation. The distribution of localized deformation areas on the surface is studied during compressive tests of cylindrical steel rods at stages II and III. It is shown that the change in the deformation patterns on the surface during the compression of cylindrical steel rods correlates with the stress-strain curves and reflects the change in the deformation mechanisms. A study of the dynamic parameters of compressed cylindrical rods shows that with increasing compressive stresses a nonlinear increase is observed in the eigen-frequency of the samples, which correlates with stages on the deformation curve.