Abstract
This article discusses the torsion problem of a continuous cylindrical specimen used to construct a hardening curve. A brief review of the methods for processing the results of the method of torsion of a cylindrical specimen is given. The possibility of using the inverse method to determine the material model in the case of the torsion of the continuous cylindrical specimen made of steel 20H is shown. By means of QFORM 9.0 software package virtual experiment connected with torsion of a cylindrical specimen is carried out. As a result of this research, the rheological model of steel 20His determined with a high degree of accuracy. The stress-strain state of the material was analyzed during the torsion of the specimen by means of the QFORM. The results of the virtual experiment are compared with the full-scale test.Anexceptionally good match of the results was obtained. The inverse method showed its efficiency and made it possibleto determine a rheological model of the material. The model accurately describes the experimental data. The resulting material model (for steel 20H) is valid in the following range of parameters: deformation temperature of 20°C, deformation rate of 0.5 s−1, the strain range of 0 to 2.5.
Highlights
The method of testing materials by torsion has been known since 1930
The torsion method has found its application in studying the technological properties of materials under cold and hot deformation; it is used to obtain a hardening curve, which is the basis for constructing rheological model of the material [1]
The use of continuous cylindrical samples instead of tubular ones allows for larger deformation
Summary
The method of testing materials by torsion has been known since 1930. The torsion method has found its application in studying the technological properties of materials under cold and hot deformation; it is used to obtain a hardening curve (flow), which is the basis for constructing rheological model of the material [1].Currently, several versions of the implementation of the torsion method are known: the method of torsion of a tubular sample, the method of torsion of a continuous cylindrical sample, the method of torsion of a conventionally tubular sample. The method of testing materials by torsion has been known since 1930. The torsion method has found its application in studying the technological properties of materials under cold and hot deformation; it is used to obtain a hardening curve (flow), which is the basis for constructing rheological model of the material [1]. Several versions of the implementation of the torsion method are known: the method of torsion of a tubular sample, the method of torsion of a continuous cylindrical sample, the method of torsion of a conventionally tubular sample. Localization of strains during torsion of continuous cylindrical samples is possible
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