TRACEABILITY OF LARGE FORCE STANDARDS IN KOREA

摘要

This paper describes traceability of large force standards up to 30 MN in Korea. 15 material testing machines of each having more than 10 MN capacity in industrial companies have been used for evaluating performances of mechanical components such as a pot bearing or an elastic bearing which is one of the important components in bridges. We have10 MN force standard machine with relative uncertainty of 5 × 10{sup}(-4) (k=2). We designed build-up force measuring systems of having 30 MN capacity to be used in calibrating material testing machines above 10 MN capacity. We have evaluated uncertainty budgets of build-up systems. Also, this paper summarizes calibration results of a material testing machine of 30 MN in Korea.