Studying the Effect of Different Environmental Conditions on the Tensile Strength of RGO Reinforced Adhesively Bonded Bu
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TECHNICAL ARTICLE—PEER-REVIEWED
Studying the Effect of Different Environmental Conditions on the Tensile Strength of RGO Reinforced Adhesively Bonded Butt Joints Mohammad Ali Saeimi Sadigh
Submitted: 13 July 2016 / in revised form: 27 September 2016 / Published online: 31 October 2016 Ó ASM International 2016
Abstract Nanoscale reinforcements are increasingly being used to improve mechanical, electrical and thermal behavior of polymers. In this study, the effects of reduced graphene oxide (RGO) epoxy filler on the tensile strength of adhesively bonded butt joints were investigated in a variety of environments. Firstly, dry butt joints with different RGO contents were tested using a uni-axial tensile test machine and it was observed that the joints reinforced with 0.5 wt.% RGO showed 22% higher strength than the joints without RGO reinforcements. Secondly, the effects of moisture, salt environment, and dry heat condition were investigated on the strength of the butt joints with different RGO contents. Results show that RGO particles significantly improve the strength values of the joints exposed to moist and dry heat conditions, but have less effect in salt environments. Keywords Butt joint Adhesive Reduced graphene oxide Effects of hostile environment
Introduction In recent years, nanoscale reinforcements are increasingly being used to improve mechanical, electrical, and thermal behavior of the polymers. These nanoadditives have attracted interest in the field of designing lightweight structures. Among these efforts, designing joints with high reliability is an important issue in automotive and aerospace industries [1]. Adhesive joints with excellent M. A. Saeimi Sadigh (&) Department of Mechanical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran e-mail: [email protected]
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insulating, superior damping, and noise-reducing capabilities are widely used in industries. Many studies show that adhesively bonded joints exhibit greater load-carrying capacity and fatigue strength than riveted joints [2]. However, researchers continue to improve the mechanical behavior of these joints using several methods. For instance, nanofillers have recently been introduced as a promising method of improving the mechanical properties of adhesively bonded joints [3]. Recent researches show that carbon nanotubes (CNTs) enhance the material characteristics of polymers [4–7]. Karapappas [8] has demonstrated that a great improvement is observed in fracture toughness of carbon fiber reinforced plastics using CNTs. Davey [9] has shown that CNTs improve resindominated properties, such as interlaminar strength, toughness, and thermal and environmental durability. Similar results have been reported for CNT-modified epoxies [10–12]. In addition, it has been shown that a great improvement is observed in fracture toughness of carbon fiber reinforced plastics using CNTs. Yu et al. [13] have studied the mode-I fracture and fatigue life of the epoxy-matrix composites reinforced with Multi-Walled Carbon Nanotubes (MW
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