Abstract
Recently, adhesive techniques are widely used for fiber reinforced plastics (FRP) constructions from the requirements of a large size structure and efficiency of constructions using a parts system.
The adhesive strength of FRP has been examined for carbon and boron FRP, which have high strength and high rigidity, to meet the demand for the usage in an aircraft. But studies on the glass/polyester FRP adhesive constructions used widely in various areas have not been carried out extensively.
This paper reports the adhesive strength and stress distributions of FRP adherents, which are constructed with glass/polyester FRP adhesive joints. The configuration of adhesive joints used was of a single lap construction and they were loaded with tension-shear to consider the pure shear stress at the adhesive layers. The measurements of stress distribution were made with electric strain gages and moiré method. The bending moment and yielding at FRP adherents were investigated on these FRP adhesive joints. Three kinds of adhesives used were hard type polyester (widely used for FRP adhesive constructions), soft type polyester and epoxy-polyamide, and the shear strength of these adhesives was examined. Then, the factors affecting the strength of adhesive FRP joints subjected to bending loads, such as the dimensions of adhesive joints and the shear strength of these adhesives, were discussed.
