Journal
EXPERIMENTAL MECHANICS
Volume 48, Issue 6, Pages 809-815Publisher
SPRINGER
DOI: 10.1007/s11340-007-9095-z
Keywords
Long split Hopkinson pressure bar (LSHPB); Intermediate strain rate; Mechanical characterization; Soft material
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Funding
- Sandia National Laboratories, Livermore, CA
- United States Department of Energy [DE-AC04-94AL8500]
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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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