Abstract
We developed a device that applied contact stress to glass fiber reinforced plastics/stainless steel double lap adhesive joints. Using this device, we investigated the effect of contact stress on the strength of adhesive joints. The device was composed of a bolt adhered to a strain gauge to control the applying load. Tensile shear stress was applied to double lap adhesive joints in condition to apply contact stress to adhesive interfaces. We found that the strength of the adhesive joints increased according to increasing contact stress. We conclude that adhesive strength applied contact stress can be evaluated with stress singularity parameters for normal stress.
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