A Split Hopkinson Bar Technique to Determine Compressive Stress-Strain Data for Rock Materials
We present a split Hopkinson pressure bar technique to obtain compressive stress-strain data for rock materials. This technique modifies the conventional split Hopkinson bar apparatus by placing a thin copper disk on the impact surface of the incident bar. When the copper disk is impacted by the striker bar, a nondispersive ramp pulse propagates in the incident bar and produces a nearly constant strain rate in a rock sample. Data from experiments with limestone show that the samples are in dynamic stress equilibrium and have constant strain rates over most of the duration of the tests. We also present analytical models that predict the time durations for sample equilibrium and constant strain rate. Model predictions are in good agreement with measurements.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 750349
- Report Number(s):
- SAND2000-0204J; TRN: US200221%%302
- Journal Information:
- Experimental Mechanics, Other Information: Submitted to Experimental Mechanics; PBD: 24 Jan 2000
- Country of Publication:
- United States
- Language:
- English
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