Experimental investigations on fatigue life enhancement of composite (e-glass/epoxy) single lap joint with graphene oxide modified adhesive

Abstract

With the increased use of composites in various sectors as a lightweight material exhibits high strength to weight ratio with tailor made properties. It becomes necessary to focus on various joining methods and different types of composite joints and their strength. The present study aims to improve the mechanical strength of single lap joint of composite material comprises of E-glass fibers and nano modified adhesive. Epoxy adhesive has been modified by dispersing Graphene Oxide (GO) to investigate the possibility of enhancement in the fatigue strength and fracture resistance of the single lap joint. Modified Hummer’s method has been used for synthesis of Graphene Oxide. Experimental investigations have been carried out for comparison of tensile and fatigue strength which shows significant improvement in the number of failure cycles for 0.25 wt.% and 0.75 wt.% GO concentrations respectively as compared to neat adhesive. Tension test results showed a significant increase in the fracture toughness of the joint due to addition of GO nanoparticles. There has been 33% and 19% increase in fracture toughness in 0.25 wt.% and 0.75 wt.% GO samples respectively as compared to neat adhesive. Improvement in fracture toughness, among all other nano-reinforcements has been obtained using GO, mainly because of its better capability of deviating the crack growth path to the longer path causing the final failure to retard and consequently improving mechanical properties of the adhesive for the tensile and fatigue strength parameters.

Mechanical Response of Glass–Epoxy Composites with Graphene Oxide Nanoparticles

“…The dispersion of nanoparticles is one of the key parameters to enhance the mechanical properties. The uniform dispersion of GO without agglomeration was achieved using ultrasonication followed by a magnetic stirrer with a speed of 1500 rpm for 30 min [ 29 ]. A hardener was added during the post-stirring process.…”

Nano-silika ve GNP Hibrit Nanoparçacık Takviyeli Tek Bindirmeli Bağlantıların Kesme ve Kırılma Özellikleri

“…To address this issue, scientists have studied some techniques such as the use of nano/microparticles, applying pretreatment to the adhesive, and changing the chemical/physical structure of the adhesive, which will improve the mechanical performance of the adhesives by increasing the adhesion ability (Bjørgum et al, 2003;Cakir and Kinay, 2021;Adin and Adin, 2022;Soydan et al, 2019;Esendemir et al, 2020). Herein, the incorporation of nano-or micro-scale particles into the adhesive has been one of the most popular methods, and it is seen in the literature that this seriously affects the mechanical performance of adhesive joints (Ayatollahi et al, 2017;Kanar et al, 2018;Saraç et al, 2019;Ghadge et al, 2021;. Khoramishad and Hosseini Vafa (2018) performed a study on the influence of aligning the graphene oxide nanoplatelets (GONP) on the fracture behaviours of adhesive joints.…”

Fatigue strength of copper and mild steel single lap joints bonded with epoxy-alumina nanocomposite adhesive

“…The addition of graphene, carbon nanotubes, and fullerene significantly improved the joint's load-bearing and displacement carrying capabilities for static loads and just slightly for fatigue loading. The effect of adding 0.25 and 0.75 Weight percentage of Graphene Oxide to the epoxy matrix was studied by Ghadge et al [6]. It was found that the addition of Graphene Oxide improved capacity to deflect crack propagation by filling microcracks generated and slowing ultimate failure which resulted in enhanced fracture toughness and fatigue properties.…”