Stiffness and Strength Changes of 3D Printed Parts Due to Bonding

3D printed parts have anisotropic characteristics depending on the infill structure, and strength changes with infill rate. Recently, some researches have being conducted to elucidate their characteristics, and it is expected that 3D printed parts will be used as robot parts. However, since the size of the 3D printed parts depends on the size of the printers. It has been required to combine to make 3D printed parts. There are few strength evaluations that consider the combination of 3D printed parts. In this study, three-point bending experiments were conducted on 3D printed parts when two or more parts were adhered as one assembled 3D printed component, and the changes in strength and stiffness were confirmed to compare with non-bonded parts. In addition, experiments were also conducted for different bonded shapes and infill structures. As a result, the bonded parts exhibited 0.73 times the strength of the non-bonded parts, with no significant change in stiffness. And it was also shown that the strength changes depending on the bonding shape. Furthermore, the strength of the bond also showed increases depending on the infill structure and the infill rate.