Withdrawal Properties of Single Dovetail Joints

鳩尾榫的引拔性質

蘇文清(Wen-Ching Su) ； 王怡仁(Yi-Ren Wang)

《台灣林業科學》 22卷3期 (2007/09) Pp. 321-328

https://doi.org/10.7075/TJFS.200709.0321

摘要

本研究使用硬槭及柳杉製作T型鳩尾榫進行引拔試驗，以探討鳩尾榫頭的尺寸（榫長、榫寬和榫厚）佈膠與否，鳩尾斜度及嵌合度等對於引拔強度的影響。結果顯示硬槭鳩尾榫的引拔強度高於柳杉榫的引拔強度。除了柳杉窄榫厚的場合之外，不同榫頭尺寸（榫長、榫寬和榫厚）之引拔強度並沒有顯著的差異。而鳩尾斜度、佈膠與否及嵌合度等的改變對於鳩尾榫的引拔強度也沒有顯著的影響。鳩尾榫的引拔強度高於方型通榫和單木釘接合。硬槭鳩尾榫的引拔破壞模式包括有(A)榫孔材縱裂、(B)榫角剪斷、(C)榫孔材縱裂併同榫角剪斷和(D)榫角壓縮。其中以模式A為最多，模式C次之。而在柳杉場合，只有破壞模式B和C，以C較多。由破壞模式觀察，可發現鳩尾榫的破壞都是發生在木材而不是鳩尾榫本身。

關鍵字

鳩尾榫 ； 引拔強度 ； 鳩尾斜度 ； 嵌合度

並列摘要

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.

並列關鍵字

dovetail joint ； withdrawal strength ； dovetail angles ； fitness