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220 Model based bolt preload monitoring using Digital Image Correlation
* 1 , 2 , 3 , 4 , 1
1  Department of Materials Engineering, KU Leuven, 9000 Ghent, Belgium
2  Department of Mechanical Engineering, Politecnico di Milano, 20156 Milan, Italy
3  MatchID, Drongen 9031, Belgium
4  KU Leuven, Department of Civil Engineering, KU Leuven, 3001 Leuven, Belgium


Bolt preload is one of the most significant parameters in bolted connections, which affects the static and fatigue performance of bolted connections. Traditional preload measuring methods give an estimation of the preload at the moment of tightening but cannot monitor preloading losses. In this investigation an initial proof of concept of a DIC based approach to relate bolt elongation to bolt preload is presented. Bolt elongation tests were performed to M16 bolts and a calibration method was proposed to obtain the bolt preload-elongation relationship for a given clamping length range.

Keywords: Preload; DIC; Bolted joints