Exploring the Mechanical Behavior of a Traditional Japanese Joint for Flexible Structural Design

Abstract

This research examines the mechanical behavior of a traditional Japanese joint, the Mortised Rabbeted Oblique (MRO) splice. Through computational simulations employing Finite Element Analysis (FEA), the study examines a continuous beam and an unmodified MRO splice, revealing expected behavior in the beam and unexpected tress concentration and displacement asymmetry in the splice. Topology optimization of the splice’s end sections yields iterations with varying volume reductions (50%, 70%, and 90%), showing significant topology differences between the two ends. Subsequently, all iterations were fabricated through 3D printing using PLA and subjected to three-point bending testing. Experimental results confirm the computational findings, demonstrating reduced strength in the MRO splice compared to the continuous beam. A surprising increase in ductility and maximum load resisted by the iterations with 50% and 70% volume reductions is observed. This finding underscores how modifying the end beams significantly influences the overall behavior of the splice mechanism.