Abstract
Dynamic measurements to correctly adjust the magnitude in fatigue testing require a dynamic calibration of force transducers and conditioning electronics if the dynamic loads are to be measured correctly. International standard ISO 4965 describes a calibration method for these components. At PTB, such a calibration of bridge amplifiers has now been performed for the first time. The calibration includes tests with static and dynamic signals. The reference for the calibration is the dynamic bridge standard of PTB. It is particularly suitable for this application as it can generate static and dynamic signals, and thus all investigations can be performed with one reference and in a reasonably short time. The signal creation and the data analysis were carried out using the open source program GNU Octave. For the data analysis, a semi-automatic procedure was developed to simplify the process. Calibrations of two digital bridge amplifiers were carried out.
Highlights
In fatigue testing, the cyclic loading and unloading of a specimen is performed
Dynamic measurements to correctly adjust the magnitude in fatigue testing require a dynamic calibration of force transducers and conditioning electronics if the dynamic loads are to be measured correctly
This could be carried out using a replica specimen with applied strain gauges as described as one option in international standard ISO 4965-1 (2012) [1]
Summary
The load itself can be measured by a force transducer which needs to be calibrated dynamically This could be carried out using a replica specimen with applied strain gauges (a so-called dynamic calibration device, DCD) as described as one option in international standard ISO 4965-1 (2012) [1]. The standard describes an assessment of the conditioning amplifier, and of the subsequent data acquisition electronics and the possible data display. This measurement procedure (described as a calibration in the standard) is rather a conformity assessment, which defines the maximum deviations. Dynamic excitation A set of nine sinusoids of common frequency with different offset values and amplitudes are generated. For the frequencies, the number of frequencies and the distribution of the magnitude of the harmonic distortions within these different frequencies are not defined at all
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