Chapter 13
High Strain Rate Tension Experiments
Features for Visco-Plastic Materials
Artem V. Basalin, Anatolii M. Bragov, Aleksandr Yu. Konstantinov,
Andrey K. Lomunov, and Aleksandr V. Zhidkov
Abstract The paper considers distinguishing features of the experiment on viscoplastic materials subjected to high strain rate tension, namely non-uniformity of
stress–strain state in the working part of a specimen due to the existence of fixing
parts and plastic strain localization. The modification of the Kolsky method (or Split
Hopkinson Pressure Bar method) is used as experimental technique. The main experimental setup configurations for testing specimens under high strain rate tension are
reviewed. We present mathematical models used for assessment of stress components distributed in a neck. The numerical modeling of high rate tension of a viscoplastic axisymmetric specimen is performed, allowing the accuracy of above models
to be estimated. The experimental–numerical procedure used to construct a true
stress–strain curve on the basis of high rate tensile experiment is described.
13.1 Introduction
Tension experiments (including high strain rate tests) hold a special place in the
system of basic experiments used for identification of material behavior. This kind
of tests allows determining deformation diagrams as well as ultimate fracture characteristics, which are necessary for prediction of strength of the structures (Volkov
et al. 2018).
Nowadays, fascinating research direction is the development of newly (scientifically) conceived materials (“metamaterials”) with mechanical properties that cannot
be found in nature (Barchiesi et al. 2018; Del Vescovo and Giorgio 2014; Placidi et al.
2016; dell’Isola et al. 2019). These (macroscopic) properties are mainly determined
by the microstructure or nanostructure of the considered metamaterial rather than
by the chemical and physical properties of the materials constituting it at the microscopic level. Designing of such metamaterials based on high gradient continuum
A. V. Basalin · A. M. Bragov (B) · A. Yu. Konstantinov · A. K. Lomunov · A. V. Zhidkov
Research Institute for Mechanics, National Research Lobachevsky State University of Nizhny
Novgorod, Gagarin ave. 23, 603950 Nizhny Novgorod, Russia
e-mail: bragov@mech.unn.ru
© Springer Nature Switzerland AG 2021
F. dell’Isola and L. Igumnov (eds.), Dynamics, Strength of Materials and Durability
in Multiscale Mechanics, Advanced Structured Materials 137,
https://doi.org/10.1007/978-3-030-53755-5_13
191
High Strain Rate Tension Experiments
Features for Visco-Plastic Materials
Artem V. Basalin, Anatolii M. Bragov, Aleksandr Yu. Konstantinov,
Andrey K. Lomunov, and Aleksandr V. Zhidkov
Abstract The paper considers distinguishing features of the experiment on viscoplastic materials subjected to high strain rate tension, namely non-uniformity of
stress–strain state in the working part of a specimen due to the existence of fixing
parts and plastic strain localization. The modification of the Kolsky method (or Split
Hopkinson Pressure Bar method) is used as experimental technique. The main experimental setup configurations for testing specimens under high strain rate tension are
reviewed. We present mathematical models used for assessment of stress components distributed in a neck. The numerical modeling of high rate tension of a viscoplastic axisymmetric specimen is performed, allowing the accuracy of above models
to be estimated. The experimental–numerical procedure used to construct a true
stress–strain curve on the basis of high rate tensile experiment is described.
13.1 Introduction
Tension experiments (including high strain rate tests) hold a special place in the
system of basic experiments used for identification of material behavior. This kind
of tests allows determining deformation diagrams as well as ultimate fracture characteristics, which are necessary for prediction of strength of the structures (Volkov
et al. 2018).
Nowadays, fascinating research direction is the development of newly (scientifically) conceived materials (“metamaterials”) with mechanical properties that cannot
be found in nature (Barchiesi et al. 2018; Del Vescovo and Giorgio 2014; Placidi et al.
2016; dell’Isola et al. 2019). These (macroscopic) properties are mainly determined
by the microstructure or nanostructure of the considered metamaterial rather than
by the chemical and physical properties of the materials constituting it at the microscopic level. Designing of such metamaterials based on high gradient continuum
A. V. Basalin · A. M. Bragov (B) · A. Yu. Konstantinov · A. K. Lomunov · A. V. Zhidkov
Research Institute for Mechanics, National Research Lobachevsky State University of Nizhny
Novgorod, Gagarin ave. 23, 603950 Nizhny Novgorod, Russia
e-mail: bragov@mech.unn.ru
© Springer Nature Switzerland AG 2021
F. dell’Isola and L. Igumnov (eds.), Dynamics, Strength of Materials and Durability
in Multiscale Mechanics, Advanced Structured Materials 137,
https://doi.org/10.1007/978-3-030-53755-5_13
191