The Influence of the Thickness and Areal Density on the Mechanical Properties of Carbon Fibre Reinforced Aluminium Laminates (CARAL)

Frattura Ed Integrità Strutturale

Cocco²,

Iacoviello³

et al. 2019

Industry needs new materials that present very high structural characteristic, such as high strength, low weight and high damage tolerance. To obtain these characteristics a new class of materials has been introduced: Fibre Metal Laminate (FML); they consist in metal sheets alternated to composite material layers: in such manner, the good characteristics of each constituent material confer the utmost properties to the FMLs. However, the mechanical properties depend, among other factors, on the thickness and the numerousness of the layers constituting the FML, as well as the interface between metal and composite. Therefore, in this paper, the influence of the abovementioned factors on the material answer to flexural load was investigated. In particular, different kinds of laminates were produced varying the layers adhesion and the layers thickness, but maintaining unaltered the metal/composite volume ratio and the total laminate thickness. Then their structural behaviour was investigated through three-point bending test, and it was found that the flexural behaviour was affected by both the investigated factors; in fact, the maximum flexural load diminished incrementing the number of layers and inserting an adhesive layer at the metal/composite interface.

Section: Resultssupporting

confidence: 90%

Experimental analysis of aluminium/carbon epoxy hybrid laminates under flexural load

Frattura Ed Integrità Strutturale

Cocco²,

Iacoviello³

et al. 2019

“…As concerns the laminates with two aluminium sheets, the type C, which was bonded with the adhesive, had a flexural strength of 514 MPa, while the type D, which was the other one without adhesive, reached a value of 561 MPa. The results of the experimental campaign carried out for this investigation are in good agreement with the results obtained by Pan et al, 21 Rajian and Kumar, 22 and Dhaliwal and Newaz. 12 The excellent repeatability of the obtained data is testified by the low value of the CoV (coefficient of variation), which reached its maximum value, equal to 10%, only on a single occasion.…”

Section: Resultssupporting

confidence: 91%

Failure energy and strength of Al/CFRP hybrid laminates under flexural load

Mat Design & Process Comms

Cocco

Iacoviello

et al. 2019

Fibre metal laminates (FMLs) are a class of hybrid laminates made of composite material plies and metal sheets; they are used for applications where extraordinary mechanical properties are needed, due to their high damage tolerance, low weight, and high strength. In the present work the behaviour of different types of aluminium-carbon fibres FMLs was studied; in particular, hybrid laminates were produced varying the layer thickness and the bonding conditions, and then they were tested according to the three-point bending procedure to evaluate the relevant flexural strength and the fracture energy. These mechanical properties were influenced by both the bonding conditions and the layer thickness; in fact, the presence of the adhesive at the composite/metal interface made the flexural strength decrease and the fracture energy increase, while the presence of a unique aluminium sheet caused the increment of the flexural strength and a slight decrease of the fracture energy.

“…As concerns the CARALL with two metal layers, the flexural strength interval went from 468.88 to 553.30 MPa for the laminate with adhesive (type C) and from 498.38 to 641.38 MPa for that one without adhesive (type D). It is worth to note that the results found in this experimental campaign are in accordance with other works on this class of material . For all the CARALL types, the coefficient of variation (CoV) was very low; in fact, it was equal to about 5.5% to 7.3%, and only for the FML with two metal sheets bonded with resin it reached 10%.…”

Section: Materials Methods and Main Resultssupporting

confidence: 90%

Flexural strength of aluminium carbon/epoxy fibre metal laminates

Mat Design Process Comm

Cocco

Iacoviello

et al. 2019

Fibre‐metal laminate (FML) is a material constituted by composite laminae and metal sheets, whose mechanical properties can be tailored by varying the thickness and the number of layers. For this reason, in the present work different types of FML made of carbon‐fibre–reinforced polymer and aluminium sheets were produced and tested; in particular, the influence of both the layer thickness and the layer adhesion was analysed through three‐point bending tests. It was found that both the abovementioned factors influenced the flexural strength of FML; precisely, the presence of an adhesive layer between the composite plies and the metal sheet made the flexural strength decrease, while this mechanical parameter increased passing from two metal sheets to only one.