Strain measuring accuracy with splitting-beam laser extensometer technique at split Hopkinson compression bar experiment
| Autor: | M. Traczyk, Jacek Janiszewski, Robert Panowicz |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Strain (chemistry) Computer Networks and Communications Bar (music) General Engineering 02 engineering and technology Split-Hopkinson pressure bar Strain rate Compression (physics) 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics 020303 mechanical engineering & transports 0203 mechanical engineering Artificial Intelligence 0103 physical sciences Beam laser Composite material Information Systems Extensometer |
| Zdroj: | Bulletin of the Polish Academy of Sciences Technical Sciences. 65:163-169 |
| ISSN: | 2300-1917 |
| DOI: | 10.1515/bpasts-2017-0020 |
| Popis: | An accuracy problem of strain measurement at compression split Hopkinson compression bar experiments with a splitting-beam laser extensometer was considered. The splitting-beam laser extensometer technique was developed by Nie et al. to measure strain of a specimen during its tension under a high strain rate loading condition. This novel concept was an inspiration for the authors to develop own laser extensometer system, which allows for simultaneous and independent measurement of displacement of bar ends between which a compressed material specimen is placed. In order to assess a metrological property of this measuring system, a wide range of high strain rate experiments were performed, including tests with various sample materials (Al 5251, Cu OFE) with different rate of strain, and with the use of two bars material. A high accuracy of the developed laser extensometer was found in measurement of specimen strain, for which uncertainty is not greater than 0.1% and, for a typical specimen dimension, the maximum permissible error is 4.5 μm. |
| Databáze: | OpenAIRE |
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