Withdrawal Properties of Single Dovetail Joints

Abstract

T-shaped dovetail joints were designed to conduct withdrawal tests using hard maple (Acers pp.) and Japanese cedar (Cryptomeria japonica). The effects of ten on sizes (length, width, and thickness), application of glues, tail angles, and fitness levels were studied. The results showed that hard maple had significantly greater withdrawal strength than Japanese cedar. It was also found that there was no significant difference in the withdrawal strength among ten on sizes (width, length, and thickness), except for cedar with a narrow ten on thickness. No significant effects of tail angle, application of glues, or fitness levels on the withdrawal strength of the dovetail joints were observed. The withdrawal strength of dovetail joints was higher than those of the through mortise and ten on joints and dowel joints tested in this study. The failure modes of hard maple joints included (A) a longitudinal split in the mortise, (B) a shearing off of the ten on tip, (C) a mixture of modes A and B, and (D) compression of the ten on tip. Among these, the most frequent mode was mode A, followed by mode C. For Japanese cedar, only modes B and C were observed, with mode C being found more often. Thus, the findings showed that the failure modes of dovetail joints for the 2 wood species all resulted from failure of the materials.