Effect of Temperature on Tensile Strength and Mode I Fracture Toughness of a High Temperature Epoxy Adhesive

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Banea, MD (Author) FEUP; da Silva, LFM (Author) FEUP; Campilho, RDSG (Author) Other

Journal

Title: Journal of Adhesion Science and Technology

Vol. 26

Pages: 939-953

ISSN: 0169-4243

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 96 Citations

Scopus - 105 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-002-FBE

DOI: 10.1163/156856111x593649

Abstract (EN): There has been a growing requirement in the last years, particularly in the aerospace industry, for adhesives to withstand high temperatures. The most important factor to consider when studying the effect of temperature on adhesively-bonded joints is the variation of adhesive mechanical properties with temperature such as the stress-strain curve and the toughness. Adhesive strength and strain show temperature dependence, especially near the glass transition temperature (T-g) of the adhesive. Similarly, the fracture toughness is expected to show temperature dependence. In this work, an experimental study was performed to evaluate the effect of the temperature on the adhesive strength and fracture toughness of a high temperature epoxy adhesive. Bulk specimens of cured adhesive were produced and tested in tension at room temperature (RT), 100, 150 and 200 degrees C, in order to obtain a strength profile of the adhesive over this temperature range. Results showed that as the temperature increases the adhesive tensile strength reduces but the ductility increases. Pure mode I adhesive fracture toughness (G(Ic)) tests were performed on double cantilever beam (DCB) specimens at room (RT) and high temperatures (100, 150 and 200 degrees C) and the fracture toughness G(Ic) as a function of temperature was obtained. It is shown that at temperatures below T-g, the fracture toughness, G(Ic), is relatively insensitive to temperature, while above T-g (at 200 degrees C) a drastic decrease in fracture toughness was observed. (C) Koninklijke Brill NV, Leiden, 2012

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15