Box-joints are type of finger-joint which connect two planar elements at a 90° angle. This makes them a valuable tool when rapid prototyping because they enable quick construction of 3-dimensional structures from flat materials. Even so, there has been little research on the best way to design a robust box joint. To investigate this problem, I constructed chipboard beams with 5, 9, and 13 fingers and placed them in a 3-point bending test to measure their respective flexural moduli, moduli of rupture, and ultimate failure loads. The 13-finger samples had a flexural modulus of 260.05±1.27 N/mm2, approximately 30% higher than the 5- and 9-finger samples. They also had the smallest variability across all parameters.
You can read more about my research in my paper or on my poster.
Special Thanks to Dr. Barbara Hughey and Dr. Dawn Wendell for their support throughout my research process.