Fracture toughness characterization of aluminium-epoxy adhesive joints reinforced with electrospun Nylon 6,6 nanofibers

Leoni, Enrico (2019) Fracture toughness characterization of aluminium-epoxy adhesive joints reinforced with electrospun Nylon 6,6 nanofibers. [Laurea magistrale], Università di Bologna, Corso di Studio in Chimica industriale [LM-DM270], Documento ad accesso riservato.
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Abstract

The use of adhesives to join two different substrates is an efficient replacement to classic joining technologies such as welding and soldering. One the one hand adhesion has different advantages over those techniques such as an improved stress distribution and the potential weight reduction of the structure; on the other hand, two of the most important drawbacks are a relatively low fracture toughness and the need of an accurate surface preparation. These two aspects will be accurately analysed in the present work: the use of Nylon nanofibers as reinforcement for the adhesive should increase fracture toughness, while a surface preparation method consisting of mechanical and chemical treatments will be developed. After the specimens are produced, they will be tested in mode I fracture using a DCB (Double Beam Cantilever) test, which allows to measure the fracture toughness during crack propagation. At the end of the test, the surfaces of the adherends will be visually observed and SEM (Scanning Electronic Microscope) analysed in order to evaluate if adhesive or cohesive fracture occurred, and thus if surface treatments has been well developed to allow a better adhesive-aluminium joining.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Leoni, Enrico
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
CHIMICA INDUSTRIALE
Ordinamento Cds
DM270
Parole chiave
nanofibers electrospinning fracture toughness mode I fracture epoxy adhesive aluminium chemical etching
Data di discussione della Tesi
25 Ottobre 2019
URI

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