Experimental investigation of material deformation and failure regularities in a flat stressed state

Some problems of how to use modern experimental facilities—an Inston 8850 biaxial servohydraulic test system and Vic 3D Limess digital optical system—for analyzing the fields of deformation and displacements in order to investigate the regularities of material inelastic deformation and failure in a complicated stressed-deformed state are examined. Proportional loading with different ratios between the axial deformation and the shear angle is implemented. Diagrams of the material deformation for different stress states are generated. The diagrams of material deformation with a drop-down branch are obtained under uniaxial tension for samples with different ratios between the length and diameter. Information about the deformation fields taking place in the plates with stress concentrators determined by means of the correlation of digital images are presented.