Abstract
The paper presents an experimental investigation of the mode II fracture toughness behavior of dissimilar metal-composite adhesive joints using the end-notched flexure (ENF) test. The adhesive joint under study consists of a thin titanium sheet joined with a thin CFRP laminate and is envisioned tobe applied in the hybrid laminar flow control system of future aircraft. Four different industrial technologies for the manufacturing of the joint areevaluated; co-bonding with and without adhesive and secondary bonding using either a thermoset or a thermoplastic composite. The vacuum-assisted resin transfer molding (VARTM) technique is employed for the manufacturing of the titanium-CFRP joint. After manufacturing, the joint is stiffened from its both sides with two aluminum backing beams to prevent large deformations during the subsequent ENF tests. Towards the fracture toughness determination from the experimental data, an analytical model recently reported by the authors is applied; that model considers the bending-extension coupling of each sub-laminate of the joint as well as the effect of the manufacturing-induced residual thermal stresses. The load-displacement behaviors, failure patterns, and fracture toughness performances for each of the four manufacturing options (MO) investigated are presented and compared.
Highlights
Dissimilar adhesive joints are finding increasing usage in many high-performance structural applications in several industries
The analytical model presented in [6] was used for the calculation of the strain energy release rates (SERR) and mode mixities of the end-notched flexure (ENF) tests
We investigate the mode II fracture toughness of the adhesive joint shown in Figure 1, whose both titanium and CFRP adherents are very thin
Summary
Dissimilar adhesive joints are finding increasing usage in many high-performance structural applications in several industries (e.g. aerospace, automotive, wind energy, etc.). The last decades, intense scientific interest has been expressed towards the experimental investigation and characterization of the quasi-static mode I, mode II, and mixed-mode I/II interfacial fracture toughness of structural adhesive joints consisting of either similar (e.g. metal-metal or composite-composite) or dissimilar (e.g. metal-composite) adherents. A review of the related literature is presented in our previous paper [1] The quasistatic mode II fracture toughness behavior of adhesively bonded joints between titanium and carbon-epoxy composite adherents under ENF loading is experimentally investigated. The four MO used were compared in terms of their load-displacement responses, failure patterns, and SERR performances
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