Journal of Applied and Computational Mechanics

The Direct Impact Method for Studying Dynamic Behavior of ‎Viscoplastic Materials

Document Type : Research Paper

Authors

1 National Research Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Avenue, building 6, Nizhny Novgorod 603950, Russian Federation

2 Department of Mechanics of Materials and Structures, Faculty of Civil and Environmental Engineering, Gdansk University of Technology,‎ ‎11/12 Gabriela Narutowicza Street, Gdansk, 80-233, Poland‎

3 Department of Civil and Environmental Engineering and Architecture (DICAAR), University of Cagliari, Via Marengo, 2, 09123 Cagliari, Italy

Abstract

This work is devoted to the direct impact method for determining the deformation diagrams of viscoplastic materials at high strain rates. As the conventional Split Hopkinson Pressure Bar method, the direct impact method is based on the measuring bar technique. The description of the experimental scheme and the traditional experimental data proceeding method are given. The description and the results of numerical analysis of the direct impact scheme are presented. A modified procedure for processing experimental information is proposed which allows to expand the area of correct calculation of strains in the specimen according to the experimental data obtained by the direct impact method. As an illustration the deformation diagrams of copper S101 and aluminum alloy D16T in the strain rate range from 1000 to 10000 s-1 have been obtained using the Split Hopkinson Pressure Bar method and the direct impact method. The use of the direct impact method made it possible to obtain deformation curves at strain rates an order of magnitude higher than the conventional SHPB method. The range of studied plastic deformations is increased by 4 times for the case of copper and 3 times for aluminum alloy.

Keywords

Main Subjects

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[1] Borovkov, A.I. et al., Computer Engineering Tutorial, Saint Petersburg, SPBPU Publ., 2012.
[2] Bragov, A.M., Konstantinov, A.Yu., Lapshin, D.A., Novosel'tseva, N.A., Tatarskiy, A.M., A System Approach for Strength Problem Solution of the BN-800 Reactor Plant Elevator for an Emergency Case of Carriage Running-off, Problems of Strength and Plasticity, 80(1), 2018, 72–82.
[3] Vilenskiy, O.Yu., Konstantinov, A.Yu., Lapshin, D.A., Malygin, M.G., Pristrom, S.A., Computational Analysis of Roller Supports Strength under Roof Slab Block Drop on the BN-600 Reactor, Problems of Strength and Plasticity, 78(4), 2016, 359–367.
[4] Salvado, F.C., Teixeira-Dias, F., Walley, S.M., Lea, L.J., Cardoso, J.B., A review on the strain rate dependency of the dynamic viscoplastic response of FCC metals, Progress in Materials Science, 88, 2017, 186–231.
[5] ASM Handbook, Vol. 8, Mechanical Testing and Evaluation, ASM Int., Materials Park OH, 2000, 462–476.
[6] Bragov, A.M., Lomunov, A.K., Features of the construction of strain diagrams by the Kolsky method, Applied Problems of Strength and Plasticity, 28, 1984, 125-137.
[7] Caverzan, A., Cadoni, E., di Prisco, M., Tensile behaviour of high performance fibrereinforced cementitious composites at high strain rates, International Journal of Impact Engineering, 45, 2012, 28–38.
[8] Davies, R.M., A critical study of the Hopkinson pressure bar, Philosophical Transactions of the Royal Society A, 240, 1948, 375−457.
[9] Eskandari, H., Nemes, J.A., Dynamic Testing of Composite Laminates with a Tensile Split Hopkinson Bar, Journal of Composite Materials, 34(4), 2000, 260-273.
[10] Gama, B.A., Lopatnikov, S.L., Gillespie, J.W.Jr., Hopkinson bar experimental technique: A critical review, Applied Mechanics Reviews, 57(4), 2004, 223-250.
[11] Jiang, B., Zhang, R., Tensile properties in the through-thickness direction for a carbon fiber woven reinforced composite at impact loading rate, Journal de Physique IV, 134, 2006, 1071–1075.
[12] Kolsky, H., An investigation of the mechanical properties of materials at very high rates of loading, Proceedings of the Physical Society. Section B, 62, 1949, 676–700.
[13] Lomunov, A.K., Methodology for studying the processes of viscoplastic deformation and material properties based on the split Hopkinson bar, PhD thesis, 1987.
[14] Donghai, W., Hong, Z., Yuwen, Z., Numerical Simulation of SHPB Experimental Process Based on ANSYS Software, Int. J. of Mechanics Research, 8(1), 2019, 39-46.
[15] Kariem, M.A., Beynon, J.H., Ruan, D., Misalignment effect in the split Hopkinson pressure bar technique, International Journal of Impact Engineering, 47, 2012, 60-70.
[16] Radim, D., Petr, K., Tomáš, F., Numerical Modelling of Wave Shapes Dur-ing SHPB Measurement, Acta Polytechnica CTU Proceedings, 25, 2019, 25–31.
[17] Zhang, J.-H., Shang, B., Numerical study of the data processing methods in SHPB experiments, Chinese Journal of High Pressure Physics, 30(3), 2016, 213-220.
[18] Dharan, C.K.H., Hauser, F.E., Determination of stress-strain characteristics at very high strain rates, Experimental Mechanics, 10, 1970, 370-376.
[19] Klepaczko, J., Advanced experimental techniques in material testing, New Experimental Methods in Material Dynamics and Impact, Trends in Mechanics of Materials, Warsaw, 2001.
[20] Cowie, T., Gurnham, C.W.A., Braithwaite, H., Lea, L., Impact performance of aluminium foams in a direct impact Hopkinson bar, AIP Conference Proceedings, 1979(1), 110003, 2018.
[21] Hervé, C., The use of the direct impact Hopkinson pressure bar technique to de-scribe thermally activated and viscous regimes of metallic materials, Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences, 372, 2023, 2014.
[22] Xiaoli, G., Sow, C., Chady, K., Thomas, H., Guillaume, R., Material Constitutive Behavior Identification at High Strain Rates Using a Direct-Impact Hopkinson Device, 7th International Conference on High Speed Forming, April 27th-28th, Dortmund, Germany, 2016.
[23] Klepaczko, J., Malinowski, Z., Dynamic frictional effects as measured from the split Hopkinson pressure bar, Proc. IUTAM Symp, Springer Verlag, 1977.
[24] Bertholf, L.D., Karnes, C.H., Two-dimensional analysis of the split Hopkinson-pressure bar system, Journal of the Mechanics and Physics of Solids, 1(23), 1975, 1-19.
[25] Konstantinov, A.Yu., Experimental and numerical study of the behavior of structural materials under dynamic loading, PhD thesis, 2007.
[26] Bragov, A.M., Lomunov, A.K., Lamzin, D.A., et al., Dispersion correction in split-Hopkinson pressure bar: theoretical and experimental analysis, Continuum Mechanics and Thermodynamics, 2019, https://doi.org/10.1007/s00161-019-00776-0.
[27] Gong, J.C., Malvern, L.E., Jenkins, D.A., Dispersion investigation in the split Hopkinson pressure bar, Journal of Engineering Materials and Technology, 112, 1990, 309–314.
Journal of Applied and Computational Mechanics
Volume 8, Issue 2
April 2022
Pages 597-604