Numerical study of the screw-nut movement in the self-loosening process under transverses loading

Etude numérique du mouvement vis-écrou dans le dévissage spontané sous sollicitations transverses

Vincent Rafik (1) , Alain Daidié (1) , Bertrand Combes (1)

1 ICA - Institut Clément Ader

Self-loosening of bolted assemblies under transverse loading is an issue studied several times. A first study axis is about localized or generalized sliding, in threads. A second study axis is about kinematic and relative movement between the nut and the screw. The aim of this paper is to study those aspects by observing the behavior of a double shear assembly. Thus a numeric model, taking account of the threads, the boundaries conditions and the contacts in, has been developed. In the first instance, the macroscopic and microscopic behaviors, respectively self-loosening and localized slip, were observed. In the second instance, a study of the relative movement between the screw and the nut highlighted a tilting one from another, in accordance with the hypothesis made by Kasei. Therefore, this paper contributes to support the self-loosening process evolved by Kasei.

Mots clés: self-loosening; relative movement; sliding; numerical model; bolted assemblies

Domaines: Mécanique des matériaux [physics.class-ph]

Vincent Rafik, Alain Daidié, Bertrand Combes. Numerical study of the screw-nut movement in the self-loosening process under transverses loading. 15e colloque national AIP-PRIMECA, 2017, Plagne-Montalbert, France. ⟨hal-02044399⟩