VIBRATION EFFECT ON ROCKWELL SCALE C HARDNESS MEASUREMENT |
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| Tassanai Sanponpute, Apichaya Meesaplak |
- Abstract:
- Three ranges of Rockwell scale C reference hardness blocks: 20, 40, and 60 HRC were measured by deadweight-lever system hardness testing machine with two types of display: analog and digital. The testing machines were placed on the vibration table, whose frequency and amplitude of vibration can be controlled. Piezoelectric probe and vibration meter were used to confirm both amplitude and frequency of vibration. The hardness value at free from vibration is used as a reference to calculate the error of each hardness measurement at certain frequency and amplitude. Both machines give the same tendency. At vibration frequency higher than 15 Hz, there is no significant error of measurement in any vibration amplitude lower than 0.04 m/s² for all three hardness ranges. However, below 15 Hz vibration frequency, the negative error of both digital and analog displayed machine appears significantly higher and increases as the amplitude of vibration increases. Moreover, the softer range of hardness is more affected by the vibration. . Therefore, the result from this paper can be used as guideline for laboratory to control environmental vibration amplitude to be less than 0.01 m/s² for frequency (10 ± 5) Hz and 0.05 m/s² for other in Rockwell scale C hardness measurement.
- Keywords:
- vibration effect, Rockwell scale C
- Download:
- IMEKO-WC-2009-TC5-005.pdf
- DOI:
- -
- Event details
- Event name:
- XIX IMEKO World Congress
- Title:
Fundamental and Applied Metrology
- Place:
- Lisbon, PORTUGAL
- Time:
- 06 September 2009 - 11 September 2009