A split Hopkinson bar technique to evaluate the performance of accelerometers
- Univ. of New Mexico, Albuquerque, NM (United States)
- Sandia National Lab., Albuquerque, NM (United States)
We developed a split Hopkinson bar technique to evaluate the performance of accelerometers that measure large amplitude pulses. A nondispersive stress pulse propagates in an aluminum bar and interacts with a tungsten or steel disc at the end of the bar. We measure stress at the aluminum bar-disc interface with a quartz gage and measure acceleration at the free end of the disc with an accelerometer. The rise time of the incident stress pulse in the aluminum bar is long enough that the response of the disc can be approximated closely as rigid body motion; an experimentally verified analytical model supports this assumption. Since the cross-section area and mass of the disc are known, we calculate acceleration of the rigid disc from the stress measurement and Newton`s Second Law. Comparisons of accelerations calculated from the quartz gage data and measured acceleration data show excellent agreement for acceleration pulses with the peak amplitudes between 20,000 and 120,000 G (1 G = 9.8 1m/s{sup 2}) rise times as short as 20 {mu}s, and pulse durations between 40 and 70 {mu}s.
- OSTI ID:
- 175423
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0402
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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