Characterization of a Laser Extensometer for Split Hopkinson Pressure bar Experiments
| Autor: | Bryan Joyce, Janet Wolfson, Jacob Dodson, M. Dennis |
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| Rok vydání: | 2017 |
| Předmět: |
Frequency response
Materials science Mechanical Engineering Aerospace Engineering 02 engineering and technology Split-Hopkinson pressure bar 021001 nanoscience & nanotechnology Laser Accelerometer 01 natural sciences law.invention 010309 optics Mechanics of Materials law 0103 physical sciences Composite material 0210 nano-technology Laser Doppler vibrometer Strain gauge Extensometer |
| Zdroj: | Experimental Mechanics. 57:1265-1273 |
| ISSN: | 1741-2765 0014-4851 |
| DOI: | 10.1007/s11340-017-0302-2 |
| Popis: | This paper examines a laser extensometer to calculate the strain in a sample during split Hopkinson pressure bar (SHPB) experiments. This method offers a non-contact, direct method for measuring sample strain which does not rely on one-dimensional wave propagation assumptions. First a single bar experiment is used to compare the extensometer’s accuracy and frequency response against a laser vibrometer and an accelerometer. The extensometer showed a close match with the vibrometer up to a bandwidth of 10 kHz. With the performance validated, the extensometer is applied to a SHPB experiment with silicone samples. For low strains, the extensometer shows a good match to the strain determined by strain gauges on the bars. At higher strains, the radial expansion of the sample can interfere with the measurement beam from the extensometer and produce inaccurate results. |
| Databáze: | OpenAIRE |
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