Interlaminar shear strength study on CFRP/Al hybrid laminates with different properties

Bellini, Costanzo; Cocco, Vittorio Di; Sorrentino, Luca

doi:10.3221/igf-esis.51.32

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…Due to the variations in the fiber arrangement in the FRP layers, which strongly influence the measured characteristics, the results of The ILSS is closely associated with the type of additional surface treatment applied to the metallic layers (e.g., Al, Ti, or steel alloys) and to the adhesion layers between the metallic and FRP sheets. The obtained ILSS values of InverTec laminates are similar to the results of studies on FMLs with a similar, inverted, carbon fiber-reinforced polymer (CFRP)/Al ply arrangement presented by Bellini et al [20]. They analyzed the effect of additional adhesive layers on the ILSS of laminates produced using a vacuum bag process, obtaining shear strengths of 39-49 MPa.…”

Section: Tests Of Specimenssupporting

confidence: 84%

Damage to inverse hybrid laminate structures: an analysis of shear strength test

Frankiewicz

Ziółkowski

Dziedzic

et al. 2022

Materials Science-Poland

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Hybrid laminates with continuous fiber reinforcement, such as glass reinforced aluminium laminate (GLARE), aramid reinforced aluminum laminate (ARALL), or carbon reinforced aluminum laminate (CARALL), have been developed to increase the lightweight potential and fatigue resistance applied for aircraft structures. However, the use of thermosetting matrices imposes material limitations regarding recycling, malleability, and manufacturing-cycle times. The inverse hybrid laminate approach is based on a continuous fiber-reinforced thermoplastic matrix, in which a metal insert is integrated. For efficient manufacturing of the novel composites in high-volume production processes, conventional sheet metal–forming methods have been applied. It helped to reduce the cycle times and the costs of the forming equipment compared to currently used hybrid laminate-processing technologies. The present study analyzes the damage to the inverse hybrid laminate structures resulting from the interlaminar shear strength test. The tests were performed for eight laminate material configurations, which differed by the type and directions of the reinforced glass and carbon fibers in the polyamide matrix and the number of the fiber-reinforced polymer (FRP) layers in the laminates. Industrial computed tomography and scanning electron microscopy were used for analysis. Observed damages, including fiber–matrix debonding, fiber breakages, matrix fractures, interfacial debonding, and delamination in selected areas of the material, are strictly dependent on the laminate configurations. FRP layers reinforced by fibers perpendicular to the bending axis presented better resistance against fractures of the matrix, but their adhesion to the aluminum inserts was lower than in layers reinforced by fibers parallel to the bending axis.

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Section: Tests Of Specimenssupporting

confidence: 84%

Damage to inverse hybrid laminate structures: an analysis of shear strength test

Frankiewicz

Ziółkowski

Dziedzic

et al. 2022

Materials Science-Poland

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“…In fact, they are formed by metal sheets alternated with Fibre-Reinforced Polymer (FRP) layers, and this confers to the material the desired mechanical characteristics [2,3]. From a historical point of view, FMLs were developed to overcome the poor fatigue resistance of aluminium sheets [4,5]. Moreover, FRPs suffer a decrease in mechanical properties due to exposure to water/moisture environments, which are able to damage the matrix of the composite layers [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydrothermal Ageing on Mechanical Performances of Fibre Metal Laminates

et al. 2023

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Fibre Metal Laminates (FMLs) are very interesting materials due to their light weight coupled with their high stiffness, high fatigue resistance, and high damage tolerance. However, the presence of the polymeric matrix in the composite layers and of polymeric adhesive at the metal/composite interface can constitute an Achille’s heel for this class of materials, especially when exposed to a hot environment or water. Therefore, in the present article, aluminium/carbon fibre FML specimens were produced, aged by considering different hydrothermal conditions, and then, subjected to mechanical testing. The End-Notched Flexure (ENF) test was considered for this activity. It was found that the first ageing stage, consisting of submersion in saltwater, was very detrimental to the specimens, while the second stage, composed of high and low temperature cycles, showed an increase in the maximum load, probably due to a post-curing effect of the resin during the higher temperatures of the ageing cycles and to the dissolution of salt crystals during the subsequently ageing stages in distilled water.

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“…Among hybrid materials, FMLs (Fibre Metal Laminates) are more and more considered for different applications [4,5]. These materials present high stiffness to weight and strength to weight ratios, due to the presence of composite layers and good toughness, conferred by the aluminium sheets [6,7]. Other interesting properties are the high fatigue resistance and high damage tolerance, given by composite material [8,9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Fibre Metal Laminate Flexural Behaviour

Bellini

Cocco

Iacoviello

et al. 2022

Material Design & Processing Communications

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The employment of hybrid materials is frequently a solution for applications demanding high structural performances. FMLs (Fibre Metal Laminates) represent a group of hybrid materials, composed of metal sheets and composite material layers, and they exhibit good mechanical properties due to the presence of both types of material. The aim of this article is to introduce an FEM numerical model suitable for the prediction of the flexural behaviour of aluminium sheets/carbon fibre composite FMLs. Particular attention was paid to the simulation of the interface between the metal and the composite material. Therefore, the model for the three-point bending loading of two types of specimens was prepared: a specimen type presented a structural adhesive at the interface, while the other one was bonded by using the resin of the composite material. Experimental tests were carried out to validate the numerical model, and both the obtained load-displacement curves and the failure characteristics were compared with the results of numerical simulation. The appropriateness of the proposed model was witnessed by the correspondence between experimental and numerical results.

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Interlaminar shear strength study on CFRP/Al hybrid laminates with different properties

Cited by 7 publications

References 19 publications

Damage to inverse hybrid laminate structures: an analysis of shear strength test

Damage to inverse hybrid laminate structures: an analysis of shear strength test

Analysis of Hydrothermal Ageing on Mechanical Performances of Fibre Metal Laminates

Numerical Modelling of Fibre Metal Laminate Flexural Behaviour

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