Joint strength optimization by the mixed-adhesive technique

An ideal adhesive lap joint is one in which the adhesive flexibility and strength properties vary along the overlap length. Because of greater adhesive shear strains at the edges of the overlap, a ductile and flexible adhesive should be used at the overlap ends, while in the middle a stiff and less-...

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Bibliographic Details
Published in:	International journal of adhesion and adhesives Vol. 29; no. 5; pp. 509 - 514
Main Authors:	da Silva, Lucas F.M., Lopes, Maria João C.Q.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-07-2009 Elsevier
Subjects:	Application fields Applied sciences Epoxy/epoxides Exact sciences and technology Joint design Lap shear Polymer industry, paints, wood Steels Stress distribution Structural acrylics Technology of polymers Lap shear Stress distribution Steels Epoxy/epoxides Structural acrylics Joint design Methacrylate polymer Polymer blends Lap joint Mechanical model Epoxy resin Mechanical properties Shear strength Adhesive bonding Curing (plastics) Experimental study Property processing relationship Modeling Optimization Adhesive joint Acrylic polymer Adhesive
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Summary:	An ideal adhesive lap joint is one in which the adhesive flexibility and strength properties vary along the overlap length. Because of greater adhesive shear strains at the edges of the overlap, a ductile and flexible adhesive should be used at the overlap ends, while in the middle a stiff and less-ductile adhesive should be used. This technique has been investigated in the past but only a few studies have reported any experimental evidence. In the present study, single-lap adhesive joints were manufactured and tested maintaining the same brittle adhesive in the middle of the overlap and using three different ductile adhesives of increasing ductility at the ends of the overlap. A simple joint strength prediction is proposed for mixed-adhesive joints. The mixed-adhesive technique gives joint strength improvements in relation to a brittle adhesive alone in all cases. For a mixed adhesive joint to be stronger than the brittle adhesive and the ductile adhesive used individually, the load carried by the brittle adhesive must be higher than that carried by the ductile adhesive.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0143-7496 1879-0127
DOI:	10.1016/j.ijadhadh.2008.09.009