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9. Materials Testing Machines

Siegfried Gerber

The first DKD calibration laboratory for the calibration of materials testing machines was accredited on February 10, 1994. That same year, on June 28, 1994, the first meeting of a corresponding expert panel, back then under the name of “Working Group Materials Testing Machines“ and formerly belonging to the Technical Committee “Force, Pressure, Mass“, was held at the PTB. It was attended by 23 participants. This Committee has set itself the task to discuss topics related to the calibration of materials testing machines. This includes primarily the calibration of universal testing machines, hardness testing machines, pendulum impact testing machines or testing machines for building materials.

Each year, between 50 and 60 interested persons from 7 European countries take part in the meeting of the Technical Committee “Materials Testing Machines“. Due to the fact that 70 % to 80 % of all laboratories accredited by the DAkkS are regularly represented at the meetings, the Committee very well reflects the calibration landscape in the field of materials testing machines. This allows efficient working and ensures a homogenous implementation of the standards and guidelines by the accredited laboratories. The Committee includes members of the accreditation body who provide news and information. Furthermore, representatives of the PTB and DIN provide information regarding new standards and committee activities, even during the revision process. Thus, the drafts can be discussed and new suggestions can be presented to the committees. Moreover, the Technical Committee organizes interlaboratory comparisons, discusses recent developments and topics, draws up complementary guides for standards or develops DKD guidelines within the working groups.

The effective operation is supported by the fact that the Chair of the Technical Committee “Materials Testing Machines“ is also acting as chairman of the DIN working committee NA 062-08-11 AA “Materials Testing Machines“ as well as deputy chairman of the DIN working committee NA 062-018-44 AA “Impact Testing for Metals“. The meeting always takes place after the meeting of the Technical Committee “Force and Acceleration“ and prior to the gathering of the VMPA working group “Testing Machines and Testing Equipment“, so here synergies can be exploited The Technical Committee, in cooperation with the Technical Committee “Force and Acceleration“, currently works on a guideline for the dynamic calibration of  force measuring devices and testing machines.

The Technical Committee is currently preparing a guideline (DKD-R 9-1) for the calibration and examination of the torque measuring device of torsion testing machines.