Analysis of the impact of the frequency range of the tensometer bridge and projectile geometry on the results of measurements by the split Hopkinson pressure bar method

• Autorzy: Moćko W.
• Języki publikacji: EN

Abstrakty

EN

The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient.

Słowa kluczowe

EN

Hopkinson bar; tensometer bridge; amplifier bandwidth; strain measurement

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2013
• Tom: Vol. 20, nr 4
• Strony: 555--564
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr., wzory

Twórcy

autor

Moćko W.

• Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, Warsaw, 02-106, Poland
• Motor Transport Institute, Jagiellońska 80, 03-301 Warsaw, Poland

Bibliografia

• [1] Kolsky, H. (1949). An Investigation of the mechanical properties of materials at very high rates of deformation of loading. Proc. Phys. Soc., 62B, 647.
• [2] Gray III, G.T. (2000). High Strain Rate Tension and Compression Tests. Kuhn, H., Medlin, D. (eds.). ASM Handbook vol. 8: Mechanical Testing and Evaluation, Materials Park, Ohio ASM International, 429-446.
• [3] Weinong, W., Chen, B.S. (2011) Split Hopkinson (Kolsky) Bar: Design, Testing And Applications, Springer, New York Dordrecht Heidelberg London.
• [4] Lewandowski, J. (2011) Inductive sensor for weighing of mass. Metrol. Meas. Syst.18(2), 223-234.
• [5] Moćko, W., Kowalewski, Z.L. (2013) Application of FEM in assessments of phenomena associated with dynamic investigations on miniaturised DICT. Kovove Mater. 51, 71-82.
• [6] Moćko, W., Kowalewski, Z.L. (2011) Developing and validation of FEM model of miniaturized direct impact compression testing stand. Transport Samochodowy, 32, 97-105.
• [7] Moćko, W., Kowalewski, Z.L. (2011) Dynamic Compression Tests - Current Achievements and Future Development. Engineering Transactions, 59, 235-248.
• [8] Moćko, W., Rodriguez-Martinez, J.A., Kowalewski, Z.L., Rusinek, A. (2012) Compressive Viscoplastic Response of 6082-T6 and 7075-T6 Aluminium Alloys Under Wide Range of Strain Rate at Room Temperature: Experiments and Modelling. Strain, 48, 498-509.
• [9] Skalak, R. (1957) Longitudal impact of a semi-infinite circular elastic bar. J. Appl. Mech.24, 59-64.
• [10] Jankowiak, T., Rusinek, A., Lodygowski, T. (2011) Validation of the Klepaczko-Malinowski model for friction correction and recommendations on Split Hopkinson Pressure Bar. Finite Elem. Anal. Des.,47, 1191.
• [11] Lusin, T., Agrez, D. (2012) Estimations of the Sinusoidal Signal Parameters Using the Non-uniform Exponential Tracking A/D Conversion. In IEEE Instrumentation and Measurement Technology Conference. Graz, Austria, 2274-2279. IEEE.