Bewertung der Messunsicherheit bei der Durchführung von Dauerlastversuchen mit Verbunddübeln.

Sustained load tests are necessary for product‐qualification of bonded fasteners. The aim of these sustained load tests is the evaluation of the fastening under constant tension load. Based on these tests, an extrapolation of the displacement behaviour concerning the assumed working life of the fastening is carried out. Three different measurands are of interest for sustained load tests, which are the failure load during the tension tests, the constancy of the applied sustained load, as well as the displacement. Due to the fact that every measurand is tainted with measurement uncertainty, the present paper aimed to evaluate the dimension of the expected measurement uncertainty, since this influences in consequence the forecast of the displacement behaviour over the working life of a bonded fastener. The assessment is done in accordance with the „Guide to the expression of Uncertainty in Measurement" for both, the maximum expected measurement uncertainty in compliance with the accuracy requirements of the relevant testing standards and with values from practice for the purpose of comparison. [ABSTRACT FROM AUTHOR]