Application of the Traceability Concept in Determining the Mechanical Properties of Metals Under Static Tension Using a GSO 11854-2021 Reference Material

This paper deals with the specific features of applying approved reference materials as a tool for ensuring traceability and controlling the accuracy of mechanical property measurements. The authors analyzed the theoretical approach based on ISO/IEC Guide 98-3:2008 and calculation algorithms provided by ISO 21748:2017 for evaluating measurement uncertainty. The methodology of using a GSO 11854-2021 certified reference material of St20 steel mechanical properties for evaluating the uncertainty of static tensile test measurements is considered. In order to ensure the traceability of measurement results, two options for accounting the laboratory systematic component are proposed: as a correction or a contribution to the standard combined uncertainty. According to the conducted study, the modeling approach of theoretical concepts based on ISO/IEC Guide 98-3:2008 and calculation algorithms provided by ISO 21748:2017 (Eq. 1) can be applied by accredited laboratories when assessing uncertainty in accordance with clause 7.6 of GOST ISO/IEC 17025-2019.