Abstract
This paper presents the results of the investigation of very small deformations at the very beginning of the plastic flow of the material. The studies were performed on low carbon microalloyed steel with 0.035% niobium. The tests using the digital image correlation (DIC) method were performed. The measurements by static tensile test using a digital camera at variable strain rates were carried out. The measurement results by MatchID software were analyzed. Studies have shown that at the beginning of plastic flow deformations do not occur evenly throughout the deformation zone. The stretching rates at the beginning of the plastic flow are affecting the amount and deformation distribution in the deformation zone.
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