Strength of resin-coated-adhesive-bonded double lap-shear pultrusion joints at ambient temperature

The inherited adhesion limitation of polyester and vinyl ester resin-based pultruded GFRP makes pultrusions difficult to bond, especially when a thixotropic adhesive is used. While such an adhesive is necessary for gap filling, it has a limited wettability. Therefore, coating the adherend with low-v...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2009-04, Vol.29 (3), p.294-301
Main Author: Hashim, S.A.
Format: Article
Language:English
Subjects:
Application fields
Applied sciences
Composites
Epoxy
Exact sciences and technology
Finite element stress analysis
Forms of application and semi-finished materials
Laminates
Lap-shear
Polymer industry, paints, wood
Technology of polymers
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Summary:The inherited adhesion limitation of polyester and vinyl ester resin-based pultruded GFRP makes pultrusions difficult to bond, especially when a thixotropic adhesive is used. While such an adhesive is necessary for gap filling, it has a limited wettability. Therefore, coating the adherend with low-viscosity epoxy resin, prior to bonding, improves wetting and hence increases joint strength. The paper describes the experimental methodology to achieve this, using double lap-shear (DLS) joints with various materials combinations. A significant strength improvement was reached as a result of coating the inner adherend in conjunction with using a “high adhesion” outer adherend. To further understand the effect of coating, numerical stress analysis was undertaken, including preliminary micro-models representing the composite/adhesive interface as well as overall DLS models.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2008.07.003