Abstract
This paper deals with a new method of strain measurement applied to the experimental determination of the forming limit diagrams of thin steel sheets. This method uses the correlation technique to determine the displacement field between two images taken on the same area of the sample at two different strain levels. The strains are calculated from this field. The range of strains determined between two images may be very wide. This allows to compare the initial image to one before the sample fracture or two successive images during the straining. This method shows that the strain localization may occur early during the forming process and so the onset of localized necking is not a sudden phenomenon. A method is proposed to draw the forming limit diagrams for necking.
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