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1 2007

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The dependence of brass hardness measurement system on time

Petrík J., Špetuch V.

Metrology and Measurement Systems

2007

Vol. 14, nr 4

595-602

Measurement system analysis (MSA) was used for estimation of hardness (HBS) measurement system capability. The time dependence of capability was evaluated. Experimental material Cu-Zn-Al cast alloy was used as shape memory alloy. The average and range method with 2 appraisers, 10 samples and 3 trials (indentations). was used to quantify repeatability (% EV), reproducibility (% AV) and part variation (% PV - variation between samples). The measurement was repeated 5 times in intervals of 7 days. As the values of %GRR are between 89.4% and 63.7% and values of "ndc" between 0.71 and 1.71 the used hardness measurement system is not capable and it depends heavily on the long-term variability.