Abstract
We present pulse shaping techniques to obtain compressive stress-strain data for elastic-plastic materials with a split Hopkinson pressure bar. The conventional split Hopkinson pressure bar apparatus is modified by placing a combination of copper and steel pulse shapers on the impact surface of the incident bar. After impact by the striker bar, the copper-steel pulse shaper deforms plastically and spreads the pulse in the incident bar so that the sample is nearly in dynamic stress equilibrium and has a nearly constant strain rate in the plastic response region. We present analytical models and data that show a broad range of incident strain pulses can be obtained by varying the pulse shaper geometry and striking velocity. For an application, we present compressive stress-strain data for 4340 Rc 43 steel.
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References
Kolsky, H., “An Investigation of the Mechanical Properties of Materials at Very High Rates of Loading,”Proceedings of the Royal Society of London B,62,676–700 (1949).
Kolsky, H., Stress Waves in Solids, Dover, New York (1963).
Nicholas, T., “Material Behavior at High Strain Rates,”Impact Dynamics, Wiley, New York, chapter 8 (1982).
Lindholm, U.S., Review of Dynamic Testing Techniques and Material Behavior, Institute of Physics Conference Series, Vol. 21, IOPP, Bristol, 3–70 (1974).
Franz, C.E., Follansbee, P.S., andWright, W.J., “New Experimental Techniques with the Split Hopkinson Pressure Bar,”Proceedings of the 8th International Conference on High Energy Rate Fabrication, Pressure Vessel and Piping Division, San Antonio, TX, I. Berman, andJ.W. Schroeder, editors, ASME, New York (1984).
Follansbee, P.S., “The Hopkinson Bar,” Mechanical Testing, Metals Handbook, 9th edition, American Society for Metals, Metals Park, OH, Vol. 8,198–217 (1985).
Follansbee, P.S. andKocks, U.K., “A Constitutive Description of the Deformation of Copper Based on the Use of the Mechanical Threshold Stress as an Internal State Variable,”Acta Metallurgica,36,81–93 (1988).
Nemat-Nasser, S., Isaacs, J.B., andStarrett, J.E., “Hopkinson Techniques for Dynamic Recovery Experiments,”Proceedings of the Royal Society of London A,435,371–391 (1991).
Ramesh, K.T. andNarasimhan, S., “Finite Deformations and the Dynamic Measurement of Radial Strains in Compression Kolsky Bar Experiments,”International Journal of Solids and Structures,33,3723–3738 (1996).
Gray, G.T., “Classic Split Hopkinson Pressure Bar Technique,”ASM Handbook, Mechanical Testing and Evaluation, ASM International, Materials Park, OH, Vol. 8 (2000).
Gray, G.T., andBlumenthal, W.R., “Split Hopkinson Pressure Bar Testing of Soft Materials,”ASM Handbook, Mechanical Testing and Evaluation, ASM International, Materials Park, OH, Vol. 8 (2000).
Frew, D.J., Forrestal, M.J., andChen, W., “Pulse Shaping Techniques for Testing Brittle Materials with a Split Hopkinson Pressure Bar,” EXPERIMENTAL MECHANICS,42,93–106 (2002).
Jia, D. andRamesh, K.T., “A Rigorous Assessment of the Benefits of Miniaturization in the Kolsky Bar System,” EXPERIMENTAL MECHANICS,44,445–454 (2004).
Sharpe, W.N. andHoge, K.G., “Specimen Strain Measurements in the Split Hopkinson Pressure Bar Experiment,” EXPERIMENTAL MECHANICS,12,570–574 (1972).
Yadav, S., Chichili, D.R., andRamesh, K.T., “The Mechanical Response of a 6061-T6 A1/A1203 Metal Matrix Composite at High Rates of Deformation,”Acta Metallurgica et Materialia,43,4453–4464 (1995).
Ellwood, S., Griffiths, L.J., andParry, D.J., “Materials Testing at High Constant Strain Rates,”Journal of Physics E: Scientific Instruments,15,280–282 (1982).
Duffy, J., Campbell, J.D., andHawley, R.H., “On the Use of a Torsional Split Hopkinson Bar to Study Rate Effects in 1100-0 Aluminum,”ASME Journal of Applied Mechanics,37,83–91 (1971).
Wu, X.J., andGorham, D.A., “Stress Equilibrium in the Split Hopkinson Pressure Bar Test,”Journal of Physique IV, France,7, (C3),91–96 (1997).
Togami, T.C., Baker, W.E., andForrestal, M.J., “A Split Hopkinson Bar Technique to Evaluate the Performance of Accelerometers,”Journal of Applied Mechanics,63,353–356 (1996).
Chen, W., Zhang, B., andForrestal, M.J., “A Split Hopkinson Bar Technique for Low-Impedance Materials,”EXPERIMENTAL MECHANICS,39,81–85 (1999).
Christensen, R.J., Swanson, S.R., andBrown, W.S., “Split Hopkinson Bar Tests on Rock Under Confining Pressure,”EXPERIMENTAL MECHANICS,29,508–513 (1972).
Chen, W., Song, B., Frew, D.J., and Forrestal, M.J., “Dynamic Small Strain Measurements of a Metal Specimen with a Split Hopkinson Pressure Bar,” EXPERIMENTAL MECHANICS,43,20–23 (2003).
Frew, D.J., Forrestal, M.J., andChen, W., “A Split Hopkinson Bar Technique to Determine Compressive Stress-strain Data for Rock Materials,” EXPERIMENTAL MECHANICS,41,40–46, (2001).
Forrestal, M.J., Frew, D.J., andChen, W., “The Effect of Sabot Mass on the Striker Bar for Split Hopkinson Pressure Bar Experiments,”EXPERIMENTAL MECHANICS,42,129–131 (2002).
Lewis, C.F., “Properties and Selection: Non-ferrous Alloys and Pure Metals,”Metals Handbook, 9th edition, American Society for Metals, Metals Park, OH, Vol. 2 (1979).
Ravichandran, G. andSubhash, G., “Critical Appraisal of Limiting Strain Rates for Compression Testing of Ceramics in a Split Hopkinson Pressure Bar,”Journal of the American Ceramics Society,77,263–267 (1994).
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Frew, D.J., Forrestal, M.J. & Chen, W. Pulse shaping techniques for testing elastic-plastic materials with a split Hopkinson pressure bar. Experimental Mechanics 45, 186–195 (2005). https://doi.org/10.1007/BF02428192
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DOI: https://doi.org/10.1007/BF02428192