Abstract
AbstractFiber‐metal laminates (FMLs) offer the superior characteristics of polymer composites (i.e., light weight, high strength and stiffness) with the ductility and fracture strength of metals. The bond strength between the two dissimilar materials, composite and metal, dictates the properties and performance of the FMLs. The bonding becomes more critical when the polymer matrix is thermoplastic and hydrophobic in nature. This work employed a novel bonding technique between thermoplastic composites and a metal layer using six different combinations of organic coatings. The flexural, and interlaminar shear strength of the thermoplastic fiber metal laminates (TP‐FMLs) were examined to investigate the bond strengths in the different cases along with fracture characteristics revealed from the tested samples using scanning electron microscopy. The viscoelastic performance of the fabricated TP‐FMLs were also investigated using the dynamic mechanical thermal analysis method.
Highlights
Thermoplastic fiber-metal laminates (TP-Fiber-metal laminates (FMLs)), where thin metal sheets and fiber-reinforced composites are integrated, offer the superior characteristics of the composites combined with the ductility of the metals
The flexural stiffnesses of thermoplastic fiber metal laminates (TP-FML) presented in Figure 4a displayed a light trend upward from epoxy acrylates to methacrylate adhesives and to the mixed ones
The flexural modulus values of the TP-FMLs are in acrylicagreement with our previously published work on GF/acrylic composites.[32]
Summary
Thermoplastic fiber-metal laminates (TP-FMLs), where thin metal sheets and fiber-reinforced composites are integrated, offer the superior characteristics of the composites combined with the ductility of the metals. In combination with appropriate metal surface treatments and suitably selected bonding agents, the low viscosity and in situ polymerization mechanism of the acrylic resin could be exploited for the fabrication of new-generation TP-FMLs achieving good interfacial bond strengths This has been demonstrated in our previous work[13] where various metal surface treatments and epoxy acrylate coatings were used as the bonding agents between aluminium and the composite layers. The bonding agents, which were acrylic adhesives (without hardener) mixed with epoxy acrylates, were polymerized in-situ with the liquid acrylic resin during composite fabrication, bonding the metal to the composite via covalent bonding This unique bonding technique via in-situ polymerization has been employed for the first time for this new generation of acrylic-based TP-FMLs. Mechanical characterization of the TP-FMLs in terms of flexural and short beam shear strength was performed to assess their structural integrity. The fracture surfaces were examined under a scanning electron microscope (SEM) to study the adhesion between composite and the metal layers
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