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A Long Split Hopkinson Pressure Bar (LSHPB) for Intermediate-rate Characterization of Soft Materials

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Abstract

In this study, we developed a long split Hopkinson pressure bar (LSHPB) for mechanically characterizing soft materials at intermediate strain rates. Using a proper pulse shaper, a loading pulse over 3 ms was produced for compression experiments on a PMDI foam material at the strain rates in the order of 10/s. The pulse shaping technique minimized the dispersion effects of stress wave when propagating through such a long bar system. Consistency of stress–strain curves obtained from the LSHPB and an MTS in the same strain rate range shows that a gap currently existing in intermediate strain-rate range is closed by the introduction of the LSHPB.

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Acknowledgments

This work was partially supported by Sandia National Laboratories, Livermore, CA. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL8500. The authors thank Dr. Michael J. Forrestal for posting the challenge for closing the strain-rate gap.

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Authors and Affiliations

  1. Schools of AAE and MSE, Purdue University, West Lafayette, IN, 47907, USA

    B. Song (SEM member), C. J. Syn (SEM member) & W. Chen (SEM member)

  2. L-3 Communications Integrated Systems, Greenville, TX, 75402, USA

    C. L. Grupido

  3. Sandia National Laboratories, Livermore, CA, 94551, USA

    W.-Y. Lu (SEM member)

Authors
  1. B. Song
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  2. C. J. Syn
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  3. C. L. Grupido
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  4. W. Chen
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  5. W.-Y. Lu
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Correspondence to B. Song.

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Song, B., Syn, C.J., Grupido, C.L. et al. A Long Split Hopkinson Pressure Bar (LSHPB) for Intermediate-rate Characterization of Soft Materials. Exp Mech 48, 809–815 (2008). https://doi.org/10.1007/s11340-007-9095-z

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  • DOI: https://doi.org/10.1007/s11340-007-9095-z

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