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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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The effect of design on adhesive joints of thick composite sandwich structures

Canyurt O. E., Meran C., Uslu M.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 31, nr 2

301-305

Purpose: of this paper is to provide the joint the behavior caused by the material, pre-stress, bonding thickness and the tongue length. Design/methodology/approach: A simple but effective design can considerably improve the joint strength of thick adhesive composite joints. The joint under investigation consists of thick woven E-glass/vinyl ester laminates joined together with tongue and groove geometry. Longitudinal tensile loads were applied to the joints, resulting in large concentrated shear and peel stresses near the free edges of bondlines. Findings: The new design intends to reduce the adhesive peel stress by application compressive pre-stress on the free edges of bondlines and thus leads to an increase of joint strength. The bonding clearances, tongue length, pre-stress and using different tongue made of steel/aluminum have an effect on the joint strength. The tests further confirm that joint strength increases significantly by applying the transverse pre-stress. There is a 2 times increment on the joint strength by applying pre-stress on the edge of tongue and groove geometry. Practical implications: Selection of Steel SAE-235 insert materials and selection of Aluminum 5083 insert materials 1.7 times and 1.2 times increased the joint strength compared with the selection of composite insert materials, respectively. Originality/value: The results indicate that the better quality joint can be obtained by selecting the steel as an insert.