Analysis of various parameters responsible for measurement uncertainty in charpy impact testing

Abstract

To decide genuinity of any measured value, one must know the values of various uncertainties related to the measuring instrument. The uncertainty depends upon type construction and condition of measuring instrument, it is also influenced by the measurement process. The condition of the instrument and its handling contribute to a greater extent in deciding the accuracy of results obtained. In the present investigation, an attempt is made to find out the value of various uncertainties associated with the charpy impact testing instrument. The instrument is used to find out the toughness of material which is one of the most important properties of a material. Hence, it very much essential to know the values of various uncertainties related to the charpy impact testing instrument. The various factors responsible for measurement uncertainty in Charpy impact testing was identified. After identification, uncertainty (vulnerability) associated with various parameters of Charpy impact testing was estimated by the standard method given in guideline for uncertainty measurement (GUM) handbook. Both type A and B uncertainty value are calculated and reported in the paper. Also, a detailed analysis is carried out to get the value of overall uncertainty and method for reducing uncertainty is described in the paper.

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