Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/7387
Título: Adhesive thickness effects of a ductile adhesive by optical measurement techniques
Autor: Campilho, Raul
Moura, D.C.
Banea, Mariana D.
Silva, L.F.M. da
Palavras-chave: Polyurethane
Aluminium and alloys
Fracture toughness
Fracture
Joint design
Data: 2015
Editora: Elsevier
Relatório da Série N.º: International Journal of Adhesion and Adhesives;Vol. 57
Resumo: Adhesive bonding is an excellent alternative to traditional joining techniques such as welding, mechanical fastening or riveting. However, there are many factors that have to be accounted for during joint design to accurately predict the joint strength. One of these is the adhesive layer thickness (tA). Most of the results are for epoxy structural adhesives, tailored to perform best with small values of tA, and these show that the lap joint strength decreases with increase of tA (the optimum joint strength is usually obtained with tA values between 0.1 and 0.2 mm). Recently, polyurethane adhesives were made available in the market, designed to perform with larger tA values, and whose fracture behaviour is still not studied. In this work, the effect of tA on the tensile fracture toughness (View the MathML source) of a bonded joint is studied, considering a novel high strength and ductile polyurethane adhesive for the automotive industry. This work consists on the fracture characterization of the bond by a conventional and the J-integral techniques, which accurately account for root rotation effects. An optical measurement method is used for the evaluation of crack tip opening (δn) and adherends rotation at the crack tip (θo) during the test, supported by a Matlab® sub-routine for the automated extraction of these parameters. As output of this work, fracture data is provided in traction for the selected adhesive, enabling the subsequent strength prediction of bonded joints.
Peer review: yes
URI: http://hdl.handle.net/10400.22/7387
DOI: 10.1016/j.ijadhadh.2014.12.004
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0143749614002097
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