Effect of nanoclay‐cellulose adhesive bonding and hybrid glass and flax fiber face sheets on flax fiber honeycomb panels

Abstract

This study investigated the feasibility of using natural fiber material to create honeycomb cores, as traditional cores made of aluminum, Nomex, and petroleum‐based materials are not environmentally friendly. The natural fiber honeycomb cores were formed using a 3D printed molding process and were bonded to flax and glass fiber facings to improve the durability of the structures. The addition of cellulose and nanoclay to the adhesive enhanced the flexural strength of the structures by 7.43% and 10.48%, respectively, while also absorbing 8.67% and 8.91% more impact energy than structures bonded with epoxy alone. However, the compressive strength decreased by 10.79% and 13.6% with the addition of cellulose and nanoclay to the adhesive, respectively. Tensile properties were also studied, and the tensile strength of hybrid facings was found to be 69.45% higher than those using solely flax facings. Additionally, hybrid facings effectively reduced moisture uptake, making them hydrophobic and reducing water uptake by 46.89% compared to solely flax facings. Overall, natural fiber honeycomb composite structures showed comparable performance to Nomex and aluminum honeycomb composites, offering favorable properties while being constructed using environmentally friendly materials. The efficient manufacturing process using additive manufacturing makes these structures readily customizable and scalable, leading to their implementation in numerous applications such as aerospace, automotive, and marine industries.

A new platform for designing high‐performance epoxy film adhesive with poly (butyl acrylate‐block‐styrene) block copolymer and alumina nano particles in aluminum–aluminum bonded joints: Preparation and analysis of the mechanical, adhesion, and thermal properties

“…The advantages of adhesive joints over the other types have resulted in their wide application in recent years. [1][2][3] Towing to their high chemical and thermal stability, corrosion strength, low curing shrinkage, great stability, and excellent adhesion, epoxy resins have found extensive applications in various industries. [4][5][6][7] These adhesives are produced in various forms and can be selected based on their application.…”

Effects of core geometry, silica nanoparticles, and polyurethane foam on the mechanical properties of a novel circular-shaped core sandwich panels under compression test: Experimental study

“…Tavakol et al 20 examined the effects of graphene nanoparticles on the strength of sandwich structures under low-velocity impact using experimental and numerical methods. Govender et al 21 studied the effect of nanocellulose-based adhesive bonding on the compressive strength of hybrid panels reinforced with flex and glass fibers featuring a honeycomb core. Mani et al 22 analyzed the flexural and compressive strength of foam-filled composite sandwich panels reinforced with silicon nanoparticles subjected to lowvelocity impact.…”

Enabling Thin-Edged Part Machining of Nomex Honeycomb Composites via Optimizing Variable Angle of Disc Cutters

“…In terms of physicochemical properties, NHCs exhibit good corrosion resistance, flame retardancy, and dielectric properties [ 4 , 5 ], which enhance their performance under extreme conditions. Moreover, the honeycomb structure of NHCs is inspired by the natural honeycomb, featuring a periodic topology that provides excellent impact resistance [ 6 ], negative Poisson’s ratio [ 7 ], negative thermal expansion [ 8 ], compressive torsion [ 9 ], and negative stiffness [ 10 ]. Consequently, NHCs have extensive applications in aerospace, transportation, construction, and other industries [ 11 ].…”