Calculation-experimental analysis of the ultimate strength of a material under biaxial tension using the finite element method

Abstract

The article emphasizes the importance of taking into account the rigidity of the stress-strain state (SSS) when evaluating the static strength of parts and elements of highly loaded structures. The description of the universal characteristic of the SSS allowing to estimate the SSS rigidity in the construction zone is given. The estimation of the SSS rigidity in the zone of destruction of the experimental model of a choke unit with a spherical body under its quasi-static loading by internal pressure is considered. A calculation and experimental technique for estimating the limiting state of spring-steel 50CrV4 steel under conditions of biaxial stretching based on the use of laboratory prismatic samples for evaluating the strength of a material under a biaxial stress state is described. The results of numerical finite element analysis of elastoplastic deformation of prismatic samples performed in the MSC Marc software package are presented. The obtained results show a significant influence of the SSS rigidity on the ultimate characteristics of the material of the steel used in comparison with its traditional strength limit.