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Preliminary assessment of the fatigue strength of hybrid (bolted/bonded) joints as a function of the visco-elastic properties of the adhesive layer

To, Minh Nhat and Paroissien, Eric and Lachaud, Frédéric and Nassiet, Valérie and Hassoune, Bouchra and Aufray, Maëlenn and Welemane, Hélène and Silva, Lorraine and Berot, Océane-Sophie Preliminary assessment of the fatigue strength of hybrid (bolted/bonded) joints as a function of the visco-elastic properties of the adhesive layer. (2021) In: 13th European Adhesion Conference 2021, 11 October 2021 - 14 October 2021 (Virtual event, France).

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Abstract

In joined structures, the joint allows for the transfer of loads between the structural components. Consequently, the structural integrity is closely related to the ability of joints to sustain the considered load. However, ensuring the strength of the joint may require in some cases a local increase of the material volume (e.g. thickness, overlap length) leading to a weight overload [1]. The proper choice of joining technology is then decisive for the strength-to-mass ratio of the manufactured structures. Mechanical fastening or bolting, such as riveting or screwing, is a tailored joining technology, extensively applied for primary structural components in aeronautics. Adhesive bonding is also used by civilian aircraft manufacturers but under the condition of being associated with a redundant load transfer path so as to meet damage certification requirements. This latter joining technology is then not the most common design solution [2], even though it may offer higher static and fatigue strength than bolting at lower embedded mass. An alternative and interesting issue stands in the association of adhesive bonding with bolting leading to a hybrid (bolted/bonded) joining approach – termed HBB. The HBB joining technology can be considered as a relevant concept of waiting fail-safe structures [1]. Provided a judicious choice of the adhesive material, numerous experimental and numerical works demonstrated that HBB joining technology could lead to the increase of static and fatigue strengths while offering a redundant path load [3]. The objective of this work is to numerically assess the influence on the fatigue strength of HBB joints as a function of the inherent visco-elastic properties of the adhesive material. The numerical tests are based on the simplified stress analysis embedded through the macro-element technique [4]. Following Musto and Alfano [5], the adhesive layer is simulated as a standard linear solid with one Maxwell arm including a bilinear damage evolution law.

Item Type:Conference or Workshop Item (Other)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:15 Oct 2021 14:01

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