Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on the Evaluation of Uncertainty of Rockwell Hardness C Scale According to the Korean Industrial Standards(KS)

한국산업표준(KS)에 따른 로크웰 경도 시험기의 불확도 산정에 관한 연구

  • Bahng, G.W. (Div. of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Tak, Nae-Hyung (Div. of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science)
  • 방건웅 (한국표준과학연구원 물질량표준부) ;
  • 탁내형 (한국표준과학연구원 물질량표준부)
  • Received : 2000.04.07
  • Published : 2000.05.30
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Abstract

Recently, uncertainty of hardeness became a major concem for the people working on the laboratory evaluation and accreditation. It is required to indicate uncertainty of hardness tester on the report after calibration. In addition to this, uncertainty of certified hardness reference block is also required to indicate on the certification sheet. Method on the evaluation of uncertainty in hardness measurement is agreed only recently for Rockwell hardness C scale. In this paper, a preliminary calculation of uncertainty based on type B evaluation has been made for hardness testers which satisfies the requirements of Korean Standards. It was found that the tolerance limit of mean value specified in KS should be increased to be compatible with the calculated uncertainty.

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Acknowledgement

Supported by : 과학기술부