Variability of a Bolted Assembly Through an Experimental Modal Analysis

Sami Daouk (1) , François Louf (1) , Christophe Cluzel (2, 1) , Olivier Dorival (3) , Laurent Champaney (1)

1 LMT - Laboratoire de Mécanique et Technologie
2 IUT-SGM - Département Science et Génie des Matériaux d'Evry
3 ICA - Institut Clément Ader

Industrial structures are mainly assemblies with complex geometries and non-linear characteristics. Friction and joint preload added to fabrication imperfections lead to a substantial gap between numerical models and real structures. In order to develop accurate generic models, it is then necessary to quantify the behavior variability, especially the one related to the joint conditions. The first part of this paper describes the iterative sizing procedure of an academic assembly which characteristics may vary depending on several input variables (e.g value of the bolt torque, number and position of preloaded bolts, etc.). The properties of the bolted joint were optimized in order to satisfy a set of conditions in terms of tangential slipping, normal displacement and maximum stress level. The second part concerns the experimental modal analysis of the assembly. The main purpose is to characterize the relationship that exists between the input variables and the measured eigenfrequencies and modal damping of the assembly.

Mots clés: Experimental variability; Bolted joints; Uncertainty quantification; Modal analysis; Modal damping

Domaines: Mécanique [physics]

Sami Daouk, François Louf, Christophe Cluzel, Olivier Dorival, Laurent Champaney. Variability of a Bolted Assembly Through an Experimental Modal Analysis. IMAC XXXIII - A Conference and Exposition on Structural Dynamics, Feb 2015, Orlando, United States. ⟨10.1007/978-3-319-15224-0_18⟩. ⟨hal-01183173⟩