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Analysis of Fracture in Aluminum Joints Bonded with a Bi-Component Epoxy Adhesive

2010; ASM International; Volume: 39; Issue: 2 Linguagem: Inglês

10.1520/jte102753

1945-7553

Marco Alfano, Franco Furgiuele, Leonardo Pagnotta, Gláucio H. Paulino,

Numerical methods in engineering

Abstract Adhesive bonding is a viable alternative to traditional joining systems (e.g., riveting or welding) for a wide class of components belonging to electronic, automotive, and aerospace industries. However, adhesive joints often contain flaws; therefore, the development of such technology requires reliable knowledge of the corresponding fracture properties. In the present paper, the candidate mode I fracture toughness of aluminum/epoxy joints is determined using a double cantilever beam fracture specimen. A proper data reduction scheme for fracture energy calculation has been selected based on the results of a sensitivity analysis. Furthermore, a scanning electron microscope is used in order to explore the locus of failure. Finally, the experimental findings are assessed by means of numerical simulations of crack growth carried out using a cohesive zone model.