Abstract
FML (Fibre Metal Laminate) is a hybrid material that presents outstanding structural properties, such as resistance to cyclic and dynamic loads, together with low specific weight. This material consists of metal sheets alternating to composite material layers. In the present work, the ILSS (Interlaminar Shear Strength) was evaluated for different types of carbon fibre/aluminium FML, produced varying the layer thickness and the bonding solution of layers. In fact, FMLs consisting of one or two metal sheets (a parameter strictly connected to the layer thickness, as the metal/composite volume fraction was kept at constant value) and bonded with structural adhesive or prepreg resin were considered for this study. The ILSS was determined according to the three-point bending method with short beam specimens. The experimental tests evidenced an effect of the adhesion methodology on the ILSS value, while the layer thickness did not influence the interlaminar strength. The mechanical behaviour after the maximum load point was investigated too, evaluating the trend of the shear stress as a function of the loading nose displacement.
Highlights
F ML is a particular hybrid material constituted by metal sheets alternated to composite material laminates
The composite material nature strongly determines the structural characteristics of the whole hybrid laminate; a higher impact toughness is given by the aramid fibres, while carbon fibres are not suitable for this purpose; the latter is more appropriate for high-cycle fatigue applications, while the former for low-cycle fatigue ones [5]
It can be noted that the highest shear strength was equal to 49.03 MPa and it was reached by the laminate characterised by a single metal sheet and metal/composite bonding assured by structural adhesive, while the lowest value was equal to 39.08 MPa and was obtained by the other laminate with a singular metal sheet, that one without structural adhesive
Summary
F ML is a particular hybrid material constituted by metal sheets alternated to composite material laminates. The influence of both the metal/composite bonding and the layer thickness on the ILSS value of different hybrid laminates was investigated. This kind of mechanical test was chosen because it highlights the characteristics of the interface between the constituents of the FML. The effects of adhesive thickness between metal and composite on the structural characteristics of GLARE was investigated by Li et al [12]; instead, the influence of loading conditions on the shear strength and the damage mechanism were studied by Liu et al [13]. An in-depth study on the flexural behaviour of different types of CARALL, characterized by different layer thickness and composite/metal bonding, was carried out by Bellini et al [17,18,19,20]
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