|Title:||Calibration and verification of the torque measuring device of torsion testing machines : Guideline DKD-R 9-1|
|Authors:||DKD Technical Committee Materials Testing Machines, Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887|
|Contributors:||HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887|
|Resource Type:||Text / Technical Requirement|
|Publisher:||Physikalisch-Technische Bundesanstalt (PTB)|
CC by-nc-nd 3.0
|Relationships:||IsVariantFormOf: DOI 10.7795/550.20210618A|
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|Abstract:||This guideline is applicable to the static calibration and verification of torsion testing machines using a procedure based on the calibration of materials testing machines according to DIN EN ISO 7500-1. The verification implies a general inspection of the torsion testing machine, including the parts used for the application of torque; a calibration of the torque measuring device of the torsion testing machine and a confirmation that the determined properties of the torsion testing machine meet the limits given for a specified class.
DKD-R 9-1 refers to the static calibration and verification of torque measuring devices. The calibration results are not necessarily valid for high-speed tests or dynamic testing.
This Guideline may also be used for the calibration and verification of indicating devices of testing machines or test rigs using the measurand torque, e.g. fastener test benches, brake test benches, etc. This Guideline is not meant for the calibration of measuring instruments such as torque wrenches.
As for the torsion testing machines, a distinction must be made as to whether the test specimen is subjected solely to torque, or whether there is a simultaneous application of force in addition to torque. In the latter case we are dealing with an axial/torsional testing machine. However, when calibrating an axial/torsional testing machine, this Guideline considers it to be only a torsional testing machine. Therefore, the calibration is carried out without applying defined forces. The load path of the axial/torsional testing machine has to be adjusted to zero force at any time throughout the calibration. In this case, the calibration certificate should state that the test system has been calibrated at zero force.
|Citation:||Guideline DKD-R 9-1 Calibration and verification of the torque measuring device of torsion testing machines, Edition 05/2021, Revision 0, Physikalisch-Technische Bundesanstalt, Braunschweig and Berlin. DOI: 10.7795/550.20210618B|