Stress Analysis of Tubular Adhesive Joints with Delaminated Adherend

Abstract

The use of adhesive joints is becoming increasingly important in aerospace, automotive and other industries where the use of traditional fasteners is discouraged. When using composite adherends, the use of adhesively bonded joints is preferable rather than the traditional bolts and other types of fasteners, because they do not require holes, thereby removing the problems of stress concentrations around the holes. However, when using an adhesively bonded joint, there will be concentrations of the distributions of shear and peel stresses within the adhesive layer which should be controlled effectively. Therefore, the investigation of such stress variation has attracted many researchers. The aforementioned stress distributions become more complicated if the composite adherend contains a pre-existing delamination. Delamination is one of the most common failure modes in laminated composite materials; it can occur due to sudden impact by an external object, during the manufacturing process (e.g., during the filament winding process), or as a result of excessive stresses due to an applied load. It is clear that the existence of a delamination in any composite structure causes a reduction in its stiffness and in some critical situations, it may cause complete failure. This paper investigates the effect of delamination on the structural response of an adhesively bonded tubular joint with composite and aluminum adherends. The finite element method, using the commercial package ABAQUS, is used to conduct a parametric investigation. The effects of the delamination's spatial location, length, width, and the applied loading are studied. Results provide interesting insight (not necessarily intuitive) into the effect of an interlayer delamination on the stress distribution within the adhesive. Figure 15. Distribution of (a) peel stress along the overlap length and (b) shear stress along the overlap length, as a function of the delamination length L 2 , for the full annular delamination model (applied torsional moment = 100 N m, and aluminum/glass-epoxy adherends).

Investigation of Functionally Graded Adherents on Failure of Socket Joint of FRP Composite Tubes

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Effects of functionally graded adhesive on failures of socket joint of laminated FRP composite tubes

“…Goglio and Paolino (2014) reconsidered the classical model by Lubkin and Reissner for the tubular joint under axial loading, and established a solution procedure based on the Laplace transform. Esmaeel and Taheri (2009) investigated the effect of delamination on the structural response of an adhesively bonded tubular joint having composite and aluminium adherends. The same authors explored the significant influence of various geometrical and loading parameters on the peel and shear stress distributions induced in the adhesive layer.…”

Delamination damage analysis of laminated bonded tubular single lap joint made of fiber-reinforced polymer composite

“…Panigrahi and Pradhan (2009) studied the effect of the existence of across-the-width delamination damages on the stability of adhesive bonded joints with plate like composite adherends. The effect of embedded delaminations in composite adherends of a bonded TSLJ subjected to torsional loading was studied by Esmaeel and Taheri (2009). Recently, Das and Pradhan (2010, 2011) introduced an FE model to design and study the adhesion failure propagation in bonded TSLJs and tubular socket joints (TSJs).…”