Multi-material structure and dissimilar material joining for weight reduction of motorcycles

Abstract

This paper looks back on the history of motorcycle material technology, which has always challenged the creation of new value by improving engine output and fuel consumption rate and reducing the weight of the vehicle. Weight reduction began with the use of aluminum for engine blocks, mainframes and wheels, and progressed to efforts to improve design freedom and productivity using thin-walled large die-castings. When various materials are used, including material replacement from steel to titanium and aluminum to magnesium, and resin materials, there are situations where there are restrictions on fastening and welding alone. If not only stress is transmitted but also function is transmitted, it is preferable that the joints are joined so that the characteristics do not change. In such a case, dissimilar material joining is selected. We hope to elucidate the mechanism of various phenomena that occur at the interface in order to improve the reliability of the joint.