Méthodologie de caractérisation et de modélisation d'un joint adhésif sous sollicitations multiaxiales dynamiques.

Abstract : Adhesive joints are increasingly employed for bonding critical parts of industrial structures. Therefore, they are subject to complex dynamic loadings. Existing dynamic characterization techniques do not characterize only the adhesive joint, but the complete assembly. This thesis proposes an innovative experimental technique for the characterization of adhesive joints under dynamic multiaxial loadings. The experimental method relies on three main components: i) a conventional split Hopkinson pressure bar (SHPB) apparatus, ii) a novel specimen, denoted as DODECA, which enables testing of three distinct multiaxial loadings using the same method and iii) local strain and stress measurements performed by digital image correlation (DIC). The stress and strain in the adhesive joint are estimated directly from the experimental data both during loading and at the failure point. Another approach based on the Finite Element Model Updating method (FEMU) has been used to complete the adhesive joint model. A numerical inverse method has been developed to obtain elastic, plastic and fracture parameters. Besides, qualitative tools have been proposed to estimate uncertainties on identified parameters. This work has proven the value of local high-speed imaging to characterize adhesive joints.This innovative method has been validated on another specimen denoted as BIADH45. This last study has also emphasized new research interests : in particular, the role of the interfaces in the adhesive joint failure and the benefit of substrates in CMO in dynamic characterization of adhesive joints.
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Anthony Janin. Méthodologie de caractérisation et de modélisation d'un joint adhésif sous sollicitations multiaxiales dynamiques.. Mécanique des matériaux [physics.class-ph]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLX052⟩. ⟨tel-01925055⟩

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