Abstract
Fiber metal laminates (FML) are a new class of laminated composite materials having superior mechanical properties such as excellent strength to weight ratio and fatigue life. These characteristics have significantly increased their applications in aerospace industry and high performance sports equipment. Laminates in FML are bonded together by adhesive joints using high grade epoxy resins. These adhesive joints are weak regions and may result in inter-ply failure i.e., delamination due to debonding of adhesive in joint under transverse loading conditions. This work aims at strengthening of adhesive joints using modified epoxy resins containing different weight percentage (wt %) of multiwalled carbon nano-tubes (MWCNTs). Finite element analysis (FEA) was used for simulating mode-I fracture in adhesive joint. ABAQUS v13.0 is commercially available software used for this analysis. Simulation in this paper was done using extended finite element method (XFEM) approach as this numerical technique is very popular and successfully used for precisely simulating delamination failure due to debonding. The simulations were carried out on double cantilever beam (DCB) test as per ASTM D5528 standard. Multiple simulations were carried out and in these simulations Double Cantilever Beam (DCB) was adhesive bonded by epoxy containing 0 wt% (neat epoxy), 1 wt% and 2 wt% MWCNTs. The results were obtained as force_x0002_displacement curves for each simulation carried out by XFEM and these curves were used for development of toughness_x0002_delamination curves. Later these results were compared with the results of specimen bonded by neat epoxy
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