Influence of chopped fibers on the interfacial bonding of glass fiber reinforced epoxy skin/polyurethane core in a sandwich composite

Devaraj, Selwyn Jebadurai; Arputham, Arul Jeya Kumar

doi:10.1002/pc.26868

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Meanwhile, for facing skins, fiber-reinforced polymers (FRPs), such as glass-fiber-reinforced polymer (GFRP), carbon-fiber-reinforced polymer (CFRP) and aluminum alloy, have become an option due to their excellent properties in terms of strength, stiffness and light weight. Interfacial bonding between the facing skins and core is also critical [ 25 ]. Without good interfacial adhesion, the load transfer mechanism from the facing skin to the core will not occur [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Carbon-Fiber-Reinforced Polymer Face Sheet and Glass-Fiber-Reinforced Rigid Polyurethane Foam Sandwich Structures under Flexural and Compression Tests

2023

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Composite sandwich structures are extensively used in aircraft applications. Aircraft components are required to be robust and lightweight. Sandwich structures made of carbon-fiber-reinforced polymer as the facing sheets and milled-glass-fiber-reinforced rigid polyurethane foam with a different glass fiber content as the core structure were prepared. The influence of glass fiber content in the foam on the sandwich structure’s mechanical properties was investigated. Flexural and compression tests were performed to assess the mechanical properties of the sandwich structures. Visual inspection and an optical microscope were used to observe the morphology of the polyurethane composite foams at different contents. From the flexural test, the force, facing stress and core shear stress improved with the increase in the milled fiber loading with the maximum increase at 10 wt.% loading and then a drop. Meanwhile, the compression modulus and strength increased up to 20 wt.% loadings and then dropped subsequently. The increase in the polyurethane composite foam’s compression strength shifted the bending load’s failure type from facing crack failure into core shear failure. The loadings range of 8–10 wt.% showed a transitional of the bending loading failure type. The density of the foams increased with the increase in milled glass fiber loading. At 10 wt.% loading, the density increased by 20%, and it increased by 47% at 30 wt.% loading. At 30 wt% loading, the optical microscope images of the foam showed wall thinning and broken walls that were responsible for the drop in the mechanical properties of the sandwich.

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Section: Introductionmentioning

confidence: 99%

“…The core shear failure type occurred for all sandwich panels. Devaraj et al [ 25 ] embedded chopped fiber on the interface of the face skin and core of a sandwich panel. Three different types of chopped fibers with an average length of 12 mm were used: glass, carbon and Kevlar.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Carbon-Fiber-Reinforced Polymer Face Sheet and Glass-Fiber-Reinforced Rigid Polyurethane Foam Sandwich Structures under Flexural and Compression Tests

2023

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“…Incorporating fibers into polymers has been widely accepted as a facile strategy for strengthening the polymer matrix, including the mechanical behaviors, [1][2][3][4] rheological applications, 5 thermal stability, 6,7 damping properties, [8][9][10] corrosion resistance, 11,12 and flame retardation. [13][14][15] The fiber/matrix interphase has played significant roles in transmitting external stress from resin matrix to high strength fibers [16][17][18][19] since the polymer matrix suffers from external stress.…”

Section: Introductionmentioning

confidence: 99%

Glass fiber/epoxy composites with improved interfacial adhesion by using cross‐linking sizing agent

Wang,

Zhang,

Han

et al. 2023

Polymer Composites

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Glass fibers (GFs) are frequently employed as reinforcement fibers for polymer resins such as epoxy and polyester. The mechanical behaviors of GFs polymer composites are nevertheless constrained by weak interfacial adhesion between polymer matrix and GFs. Herein, we invented a cross‐linking modified sizing agent using polyethyleneimine and bisphenol A epoxy emulsion, and studied the effect of cross‐linking extent on GF surface characteristics and GF/epoxy interfacial adhesion. The treatment of GFs with cross‐linking modified sizing agent facilitated the formation of interpenetrating polymer networks in composites for strengthening interface interaction. The results show that the modified GFs have a rough surface and improved interfacial adhesion with epoxy matrix. When sizing agents with cross‐linking extent of the 23.0%, the GF/epoxy composites show advanced interfacial shear strength (IFSS) and transverse fiber bundle tension (TFBT) strength. This work demonstrates that the cross‐linking extent of sizing agent could regulate interfacial adhesion, which is a facile and promising strategy in reinforcing glass fiber polymer composites.Highlights Crosslink the sizing agent to enhance GF mechanical properties was reported. GF surface energy was enhanced and thickness of GF/epoxy interphase increased. IFSS and TFBT strength of the GF/resin composites increased by 23.65% and 30.54%, respectively.

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Experimental investigation on failure mechanisms of hybrid steel/GFRP hat‐shaped beams under bending loading

Duan,

Lu,

Liu

et al. 2023

Polymer Composites

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The bending failure mechanism and energy absorption characteristics of hybrid metal/composite structures are the keys to the side collision safety of automobiles. The purpose of this paper is to investigate the bending behavior and failure mechanism of hybrid Steel/GFRP hat‐shaped beams under three‐point bending. Firstly, both quasi‐static and dynamic three‐point bending tests were conducted on Steel, GFRP and hybrid Steel/GFRP hat‐shaped beams. Then, the effect of layups and loading speeds on the bending failure behaviors of GFRP hat‐shaped beams were investigated, and the five stages of the bending process of GFRP hat‐shaped beams were exposed. Finally, the failure mechanism of hybrid Steel/GFRP hat‐shaped beams under both quasi‐static and dynamic three‐point bending were investigated. It is found that the failure mechanism is related to the interaction effect between the Steel and GFRP parts in the hybrid Steel/GFRP hat‐shaped beam. In the bending failure process, the crack propagation in GFRP parts is delayed by the plastic deformation of the connected Steel parts, which improves the energy absorption and load carrying capacities of the hybrid Steel/GFRP hat‐shaped beam, and this improvement in the whole bending process is quantitatively exposed in this work. Besides, it is found that with the same impact energy, the load carrying capacity of the hybrid Steel/GFRP hat‐shaped beam can be increased by the loading roll diameter increasing.Highlights A bending process with five stages of GFRP hat‐shaped beams is exposed. The loading speed increases impact loads due to the strain rate strengthening. The interaction between Steel and GFRP improves the load carrying capacity. The load carrying improvement is due to crack propagation delay in GFRP parts. The greater loading roll diameter increases the load carrying capacity.

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Influence of chopped fibers on the interfacial bonding of glass fiber reinforced epoxy skin/polyurethane core in a sandwich composite

Cited by 5 publications

References 38 publications

Characteristics of Carbon-Fiber-Reinforced Polymer Face Sheet and Glass-Fiber-Reinforced Rigid Polyurethane Foam Sandwich Structures under Flexural and Compression Tests

Characteristics of Carbon-Fiber-Reinforced Polymer Face Sheet and Glass-Fiber-Reinforced Rigid Polyurethane Foam Sandwich Structures under Flexural and Compression Tests

Glass fiber/epoxy composites with improved interfacial adhesion by using cross‐linking sizing agent

Experimental investigation on failure mechanisms of hybrid steel/GFRP hat‐shaped beams under bending loading

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