An experimental investigation of static load capacity of AL-GFRP adhesively bonded single lap and double butt lap joints

Abstract

This paper is focused on experimental evaluation and comparison of progressive damage behaviors in adhesively bonded single lap and double butt lap joints between aluminum and glass fiber reinforced plastic (GFRP). The effect of joint design and dissimilarity of adherents on damage evolution of adhesive bonding under tensile quasi static loading is analyzed. Bonding was created by toughened epoxy adhesive as one of the most important and widely used structural adhesives in aerospace, automobile and marine industries. Due to structural behaviour complexity of adherents and adhesive, the fracture takes place under mixed mode and the failure mechanism is characterized by the de-bonding area for the proposed joints. The results show that single lap joint could carry up to 30% more tensile load than the double butt lap joint with the same material properties while a combined failure mechanism could be observed and the most dominant ones were yielding of aluminum substrates, adhesive failure at bond-line on aluminum surface and cohesive failure of upper mat layers of composite material.

Anti-Corrosion Silica-Based Hybrid Coatings for the Protection of AA2024 Alloy

“…6) showed an adhesive failure mode, in which stresses within the network were the cause of deformation. Bond-line and cohesive failure modes did not show up during conducting of the test, which confirms that bonding has taken place between the adhesive layer and the adherend [14]. In addition, the load applied are directed to the adhesive layer that of the coat and that the results shown are of the formed hybrid network itself [15,16].…”

Accelerated aging effects in composites used as repair for pipes in oil industry

“…Therefore, it is an interesting study for the investigated application when associated with accelerated aging. Studies in the literature [ 20,21 ] show that there is an impairment of the adhesion between the metallic part and the composite part due to microcracks in the matrix and other aging mechanisms, which result in an irreversible degradation of the composite, generally causing adhesive failure, as adherents are generally stronger than the adhesive joint, thus causing failure of the adhesive.…”

An Experimental Investigation of the Mechanical Behavior of GFRP Co‐cured Joints

“…Co‐cured joints do not need special surface preparation once both adherents parts are subjected to the same curing and bonding process. However, the overlapping region may be the key design factor to provide the best possible performance for a non‐continuous reinforcement …”

“…Most common modes of failure in joints are rupture or yielding caused by low strength of components of the joint and delamination of adherents. In many cases, the combination of these failure modes will take place, such as for lap joints, which usually starts with yielding of adherents followed by cohesive failure of the adhesive aggravated by higher peeling stresses …”