Pulse shaping techniques for testing elastic-plastic materials with a split Hopkinson pressure bar |
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Authors: | D. J. Frew M. J. Forrestal W. Chen |
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Affiliation: | (1) Sandia National Laboratories, 87185-0325 Albuquerque, NM, USA;(2) School of Aeronautics and Astronautics and School of Materials Engineering, Purdue University, 315 N. Grant Street, 47907 West Lafayette, IN, USA |
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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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Keywords: | Hopkinson pressure bar pulse shaping elastic-plastic materials |
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