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Développement d'une nouvelle méthode de serrage intelligente pour le contrôle des assemblages boulonnés

Abstract : The subject of the thesis presented in this manuscript is the development of a new method to control the quality of a bolted assembly. This method uses the tightening torque-turn angle of the nut curves, gathered during the tightening and, more precisely, the changes of slope that affects it. The main idea is to use these changes to divide the curve into segments, each corresponding to an event that it is then possible to identify. These events are: a nut locking phase, followed by a constant torque area, a possible gap reduction phase and finally, a last linear part corresponding to the actual tightening. To validate this method two models, one analytical and the other using the finite element method, have been developed to create a baseline. The analytical model is derived from the literature as the finite element model provides originality because it simulates the rotation of the nut but also the locking through a preliminary deformation. These models are then validated in a first test campaign, which begins with the tightening of reference sample without defects. Then, defects are introduced (gaps, burrs, chips...) in order to evaluate the method detection capabilities. Limitations are discovered leading to a modification of the measures means. A first prototype is designed by instrumenting a screwdriver to be able to measure the reaction torque (the one that holds the screw) in addition to the tightening torque. This addition improves the method by detecting hidden defects. Finally a second prototype was designed and built, with full control of the tightening and thus develop new strategies for tightening, taking into account the results obtained during the various test campaigns.
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Submitted on : Friday, March 29, 2019 - 10:27:08 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:56 PM
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  • HAL Id : tel-02083610, version 1


Simon Dols. Développement d'une nouvelle méthode de serrage intelligente pour le contrôle des assemblages boulonnés. Mécanique des matériaux [physics.class-ph]. INSA de Toulouse, 2016. Français. ⟨NNT : 2016ISAT0038⟩. ⟨tel-02083610⟩



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