Nordic Intercomparison of Calibration of the Material Testing Machines Report of the Force Calibration

摘要

For us there was not known intercomparison for the calibration of uniaxial testing machine. It was the reason to work out this- kind of comparison during the year 1999. By planning the comparison there was two main problems by this kind of comparison. The first one; the object can not be circulated from calibrating laboratory to next one. The second one is that the testing machine should be measured to get the status of a reference standard. The first problem was solved tat every laboratory had to travel to the location, where testing machine was. Second problem meant that the history of testing machine should be known well and the calibration of the pilot should be made very careful. FINAS has organized this intercomparison for the calibration of the uniaxial testing machine in the year 1999 in Finland. There was three laboratories participating the comparison, two from Finland and one from Denmark. The results has shown some main problems: 1. The stability of the testing machine must be investigated well 2. The calibration method for force has high importance This paper gives some numerical value of these problems and the experiences during the intercomparison.