Adhesion and Tensile Properties of a Novel Fiber-Metal Laminate Based on Polypropylene Reinforced with Aramid Fibers.
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Adhesion and Tensile Properties of a Novel Fiber-Metal Laminate Based on Polypropylene Reinforced with Aramid Fibers. Nancy G. González-Canché, J.G. Carrillo* and R.A. Gamboa. Centro de Investigación Científica de Yucatán, A.C., Mérida, Yucatán, México. *[email protected] ABSTRACT The aim of the present study is to analyze interfacial adhesion and characterize the tensile properties of a FML elaborated from thin layers of an aluminum alloy and layers of maleic anhydride modified polypropylene (MAHPP) reinforced with an aramid woven fabric. For the analysis of interfacial adhesion, a microbond test is carried out on the MAHPP-aramid fiber system and a single lap joint test is performed on FML constituent materials, as well as the tensile characterization of the FML and its constituents is conducted accordingly. Microbond testing revealed an improvement in interfacial shear strength for the MAHPP-aramid fiber system in comparison with that of polypropylene-aramid fiber systems reported in the literature. The apparent shear strength between the FML constituent materials is comparable to that for bonding of aluminum with MAHPP. Tensile characterization of the FML and its constituents showed that the FML presented greater tensile strength than the aluminum alloy; and a more ductile behavior in comparison with its individual components due to the degree of adhesion between the constituents which allows the material to deform in unison. INTRODUCTION Fiber Metal Laminates (FMLs) are structural hybrid composite materials, consisting of layers of an aluminum alloy alternated with layers of a fiber-reinforced composite material. The development of FMLs originated in the aeronautic industry to cover the need for materials with greater resistance to fatigue and slower crack growth rate than that of aeronautical grade aluminum alloys. Initially, FMLs are elaborated using thermoset matrix composite materials, reinforced with aramid, glass or carbon fibers [1, 2]. The conventional elaboration process of FMLs is rather long due to the curing time of the thermoset matrix, which increases production time and costs. Thus, it is used mainly in aerospace and defense applications. Recent investigations have focused on the development of FMLs with a thermoplastic matrix, as an alternative to reduce production time, thereby allowing them to be used in markets such as the transport industry. Polypropylene (PP) has been used as the matrix for the development of these thermoplastic FMLs, reinforced with glass fiber or as self-reinforced PP (SRPP). FMLs based on these materials present a tensile strength greater than that of their composite material; and in particular, FMLs based on SRPP show a more ductile tensile behavior in comparison with aluminum, while both FMLs are more tenacious under impact than their metal counterpart [3-5]. MAHPP is a thermoplastic polymer which has been widely used as a coupling agent of composite materials and as an adhesive in the elaboration of FMLs given its good adhesion to aluminum [3-7]; aspects which can be well
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