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This paper deals with the stress state for the open-die forging of a staggered axial-symmetric specimen of the aluminium alloy AlMgSi0.5. The experimental-theoretical method of visioplasticity, adjusted for the process of open-die forging, consisted of five steps. The basic equations of the plasticity theory, i.e., balance equation, conditions of a plastic flow and Levy-Mises equations are applied. The basic partial differential equations of visioplasticity are obtained theoretically, while the displacement of points of the meridian cross-section, which represents the basis for its solution, can be experimentally obtained. The deformation force is calculated on the basis of the obtained results and is compared to the experimental values.

Load determination by analysing the stress state for the open-die forging of the aluminium alloy AlMgSi0.5