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Analysis of inhomogeneous deformation occurring during post-necking phase of tensile test

The aluminium-magnesium sheets used in vehicle body building are suitable for structural elements and internal panels based on their excellent strength and corrosion resistance. Due to their importance, particular attention should be paid to their strength and formability characteristics, including their behaviour during the tensile test at the stage of diffuse and local necking. With the help of the digital image correlation and 3D imaging techniques, the local deformations can be measured and the following characteristics can be calculated from them, namely the onset of diffuse and local necking, the change in geometry before fracture and the extrapolation of the flow curve from the measured axial stresses and the true cross-sectional area. AlMg3 sheets are used to measure the listed characteristics during tensile test.