Kosuke Haraga

Fatigue Strength of Adhesive/Rivet Combined Lap Joints

Abstract Adbesive/rivet combined bonding has attracted special interest recently as a joining technique of highstrength steel because of its high joint efficiency. In the present study, the strength characteristics of adhesive/rivet combined lap joints were investigated. To darify bonding conditions capable of improving the fatigue strength of combined joints, fatigue tests were conducted on the rivet, adhesive and adhesive/rivet combined joints with different lap widths, adhesive and rivet strengths. Furthermore, to compare fatigue crack initiation and propagation behavior of the adhesive joint with that of the combined joint, the strain changes were measured by strain gauges bonded onto the adherend plate near the lap end. The results indicate that the fatigue strength of adhesive joints can be improved through combination with rivets of nearly equal or slightly higher fatigue strength than the adhesive joint. Furthermore, we also confirmed that fatigue cracks propagate more gradually in combined joints...

Assembly technique for control panel enclosures with the combined use of adhesive and rivets and the reduction of energy consumption

Abstract We have developed a new assembly method of metal enclosures in which the combined use of acrylic adhesives and rivets (fasteners) are adopted as an alternative to arc welding. We have achieved the following effects: (1) elimination of skill working such as welding operation and strain correction, (2) improvement of working environment by the elimination of welding operation and putty work, (3) simplification of manufacturing process and cost reduction by introducing heatless bonding method (adhesive bonding), (4) compatibility of rigidity with weight reduction of products, (5) total energy consumption decrease to 78% by adopting this new assembly method, to 64% by thinner galvanized steel and to 51% by pre-coated steel.