Abstract
This paper primarily investigates the effects of chemically grafted modified carbon fibers on the bonding properties of fiber metal laminates (FMLs). Relative elemental content on the carbon fibers’ surface was performed via X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) was utilized to observe the material microstructure. The effect of chemically grafted carbon fibers on the bond strengths of FMLs was experimentally investigated through lap joint testing. The carbon nanotubes (CNTs) grafting concentration and curing conditions of the samples were also investigated. The test results demonstrate that grafting concentrations of 0.1, 0.2, and 0.3 mg/mL CNT solution increased the bond strength of the cured samples under vacuum conditions by 63.51%, 87.16%, and 71.56%, respectively. In addition, the bond strengths of vacuum-cured samples were also increased.
Highlights
Fiber metal laminates (FMLs) are hybrid composites of alternating layers of high-strength fiber composites and alloys, cured under pressure and temperature
(4.34%) demonstrates that melamine has been successfully grafted onto the surface of carbon fiber, and the subsequent significant increase in carbon resulted in successful carbon nanotubes (CNTs) grafting
Chemical grafting of CNTs onto the surface of carbon fibers is effective for the interfacial property improvement of FMLs
Summary
Fiber metal laminates (FMLs) are hybrid composites of alternating layers of high-strength fiber composites and alloys, cured under pressure and temperature. FML structures combine the performance advantages of fiber composites with metal materials to overcome the performance defects of each material separately [1,2,3] They possess a series of excellent properties, such as high specific modulus, high specific strength, and heat and corrosion resistance, and have been widely used in transportation, sporting goods, and aerospace applications [4,5]. Under the action of a condensing agent, the amino group provided by melamine reacted with the carboxyl group on the oxidized carbon fiber and carboxylic acid-functionalized CNT surface, respectively. In this experiment, the concentrations of various CNT solutions and the of the samples relative to the bonding strength of the FMLs were invented
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