Fatigue behavior of adhesively bonded glass fiber reinforced plastic composites with different overlap lengths

Abstract

The joining techniques of lightweight and strong materials in the transport industry (e.g. automotive, aerospace, shipbuilding industries) are very important for the safety of the entire structure. In these industries, when compared with other joining methods, the use of adhesively bonded joints presents unique properties such as greater strength, design flexibility, and reduction in fuel consumption, all thanks to low weight. The aim of this study was the analysis of the tensile fatigue behavior of adhesively bonded glass fiber/epoxy laminated composite single-lap joints with three different specimen types including 30, 40 and 50 mm overlap lengths. In this study, composite adherents were manufactured via vacuum-assisted resin transfer molding and were bonded using Loctite 9461 A&B toughened epoxy adhesive. The effect of a surface treatment method on the bonding strength was considered and it led to an increment of about 40%. A numerical analysis based on a finite element model was performed to predict fatigue life curve, and the predicted results showed good agreement with the experimental investigation.

Numerical quantification model and experiment of external force on roller hemming of curved edge aluminium alloy with adhesive

“…The traditional fluid-solid coupled method of Euler and FEM is difficult to track the free interface of adhesive during the roller hemming. Therefore, the mehsless SPH method is introduced to simulate the adhesive, which is suitable for solving large deformation and hydrodynamics problems [21]. Coupled with the FEM, it has been successfully applied in many fields due to its high efficiency [22].…”

“…SPH and FEM have different application objects and fields, but they are complementary. The coupling of SPH and FEM can be realized by contact algorithm [21,24], as shown in Figure 2. The contact force is added to SPH momentum equation and FEM equation in the form of external force:…”

“…SPH calculates the field variables of any point in the support domain by point interpolation approximation, as shown in Figure 1. The smooth function f (x i ) and its derivatives in are expressed as follows [21]…”

Effect of Stacking Sequence on Fatigue Performance of CFRP–Al Single-Lap Adhesive Joints: Experimental Study

“…S. Azari et al [ 32 ] investigated the effect of adherend thickness on the fatigue performance of joints under cyclic loads. They revealed that due to greater global stiffness and larger crack-tip stresses of thicker joints, fatigue properties of joints decreased when adherend thickness (h) increased, and when h > 12.7 mm, joint fatigue behaviour was independent of h. Kara E et al [ 33 ] studied the effect of overlap length on static and fatigue behaviours of adhesive joints. They found that increasing overlap length increased static strength but decreased fatigue life.…”

Effects of different interface conditions on energy absorption characteristics of Al/carbon fiber reinforced polymer hybrid structures for multiple loading conditions

“…The results show that the stress of the joint is not significantly improved by the reverse prebending deformation of the lap joint. Kara et al [21] compared and analyzed the influence of bond lengths of 30, 40, and 50 mm, respectively, on bonding strength and fatigue resistance. The experimental results show that the lap length can increase the static load strength but shorten the fatigue life of the joint.…”