Abstract
This paper presents an experimental and numerical characterization, typical for adhesive aerospace applications. The task is carrying two steps. The first consists on the analysis of a single lap joint produced by a carbon fiber fabric reinforced composite with five samples joined by injecting a nanostructure epoxy resin (Graphene 2% by weight) while five others are not. The shear tests have been carried out on the specimens with the purpose of measuring the resistance of the bonded joint, to look forward the resulting differences of structural performances. The second deals with numerical models which have been developed based on the experimental tests for adhesive joints using the finite element techniques. The numerical simulation has been expressed using the ANSYS software in order to analyze the adhesive lap joint model. It has been noted that two options have been retained in attention which deals with and without nano-adhesive. In the two alternatives, we focused on the cooling process where the adhesive single-lap joints are mainly generated. Roughly speaking, the experimental tests and the numerical model show a good agreement. Moreover, the Graphene increases the stiffness of the lap joints under rational loads charges. On the other side, the nanostructure injection in the adhesive has increased the failure as the load increase. However, this increase of failure depends on parameters such as adhesive structural features and nanostructure’s structure. Finally, we were fortunate to observe that, the reinforced adhesive nanostructure has decreased the weight.
Highlights
Adhesive-bonded assemblies are increasingly being used in vehicles because an adhesive-bonded assembly is light, offers good mechanical performance, and stress is repartitioned relatively uniformly throughout the bonded area [1, 2]
Five samples injected with nanostructures were tested together with five non-injected samples, and the force displacement, maximum failure load, adhesive layer thickness, and failure mode were determined for each sample
The results indicate that the nanostructure epoxy resin performs better than the epoxy resin in terms of both mechanical strength and adhesive stiffness
Summary
Adhesive-bonded assemblies are increasingly being used in vehicles (e.g., road vehicles and aeroplanes) because an adhesive-bonded assembly is light, offers good mechanical performance, and stress is repartitioned relatively uniformly throughout the bonded area [1, 2]. Adhesive bonding has been used in the primary structure of aircraft for some time, and is still used as an alternative to riveting. Many studies of bonded lap joints for aerospace applications have been performed to improve our understanding of the mechanical properties of the joints [8, 9, 10, 11]. Attempts have been made to use nano-technology to increase the stiffness of lap joints under rational load charges, to improve mechanical performance. The knowledge gained, combined with our understanding of adhesive joints reinforced with conventional additives, has given nanostructure-reinforced adhesives a key role in the aerospace and aircraft industries. Robust joint designs for use in engineered structures require stress under a certain load to be known and the potential for failure to be predicted. Adhesive-bonded joints were produced using an epoxy resin and a curing agent, using a composite reinforced with carbon fibre fabric as the adherent, with 2% graphene by weight added
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