Issue 51

C. Bellini et alii, Frattura ed Integrità Strutturale, 51 (2020) 442-448; DOI: 10.3221/IGF-ESIS.51.32 442 Interlaminar shear strength study on CFRP/Al hybrid laminates with different properties Costanzo Bellini, Vittorio Di Cocco, Luca Sorrentino Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, 03043 Cassino, Italy costanzo.bellini@unicas.it, http://orcid.org/0000-0003-4804-6588 vittorio.dicocco@unicas.it , http://orcid.org/0000-0002-1668-3729 luca.sorrentino@unicas.it, http://orcid.org/0000-0002-5278-7357 A BSTRACT . 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. K EYWORDS . CARALL; Short beam flexural test; Bonding strength. Citation: Bellini, C., Di Cocco, V., Sorrentino, L., Interlaminar shear strength variation of CFRP/Al hybrid laminates with different properties, Frattura ed Integrità Strutturale, 51 (2020) 442-448. Received: 17.10.2018 Accepted: 03.12.2019 Published: 01.01.2020 Copyright: © 2020 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION ML is a particular hybrid material constituted by metal sheets alternated to composite material laminates. The mechanical properties of this material are very interesting, since it combines the high strength/weight ratio of composite materials with the ductility of metals [1]. One of the most widespread FML is the GLARE (Glass Laminate Aluminium Reinforced Epoxy), that consists in aeronautical grade aluminium sheets joined with glass fibre laminates. However, this kind of FML does not possess high stiffness, so in the past other types of FML have been investigated [2,3]. In particular, carbon fibre composites were considered for this application, giving rise to CARALLs (Carbon Fibre Reinforced Aluminium Laminates), that have higher stiffness, but they also are troubled with galvanic F