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Experimental and Theoretical Study of the Postcritical Deformation Stage of Materials Under the Various Types of Loading Conditions

Name
Mikhail
Surname
Tretyakov
Scientific organization
Perm National Research Polytechnic University
Academic degree
PhD
Position
Scientific Researcher
Scientific discipline
Machinery & Energy
Topic
Experimental and Theoretical Study of the Postcritical Deformation Stage of Materials Under the Various Types of Loading Conditions
Abstract
The work is devoted to experimental study of the behavior of materials on the postcritical deformation stage at different types of the stress-strain state and loading conditions. Experimental and theoretical investigation of the postcritical deformation stage is necessary for forecasting of the behavior of materials in emergency cases and failure processes propagation. Results of uniaxial tension, proportional tension with torsion, complex tension-torsion loading and tension with additional vibrations are carried out.
Keywords
experimental mechanics, postcritical deformation stage, loading system, failure, survivability
Summary

Postcritical deformation stage of materials connected to the structural failure and fracturing processes and reflected on the strain curve as a descending section. Realization of the postcritical deformation stage allows using of the reserves of load-carrying ability, increase vitality and safety of the deformable systems. The work is devoted to experimental investigation of the behavior of structural carbon steels on the postcritical stage of deformation under different types of the stress-strain state.

The test results of uniaxial tension with various stiffness of the loading system with using of special test tool are obtained. It is demonstrate, that the failure moment of materials corresponds to a point on the descending section of strain curve and depends on stiffness of the loading system. Got results of the behavior of different structural steels on the postcritical stage of deformation under proportional and non-proportional tension-torsion tests at room and high temperature.

The methodic of realization of the additional vibrations during quasi-static tension with using of the biaxial test system is proposed. It is shown, that the additional loadings could lead to equilibrium deformation of specimen on the postcritical deformation stage.