The results of the analysis of geometrically and physically nonlinear problems by nonlinear photoelasticity methods are given. The strain range is from ?50% up to +250% of the relative lengthening. A geometrically nonlinear problem of a strip with central crack-cut under axial tension is analyzed. The mechanism of crack opening under the deformation was studied. A physically nonlinear problem of necking in a metal strip is analyzed. The change of the geometry in the plane and along thickness is taken into account.
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