查詢結果分析
來源資料
頁籤選單縮合
題名 | 木材單鳩尾榫接之的抗彎性質=Bending Properties of Wood with Single Dovetail Joint |
---|---|
作者 | 王怡仁; 古鎮維; | 書刊名 | 林產工業 |
卷期 | 35:2 2016.06[民105.06] |
頁次 | 頁59-66 |
分類號 | 474.1 |
關鍵詞 | 鳩尾榫接; 抗彎力矩; 剛性效率; 鳩尾斜度; 嵌合度; Dovetail joint; Bending moment; Joint rigidity efficiency; Dovetail angles; Fitness; |
語文 | 中文(Chinese) |
中文摘要 | 本研究製作鳩尾榫T-型試件進行抗彎試驗,以了解鳩尾榫的抗彎力矩、抗彎剛性效率與破壞模式。藉由改變材種、鳩尾榫幾何如榫寬、榫長、榫厚及鳩尾斜度、膠合狀態和嵌合度等因子,以了解鳩尾榫在不同條件下的抗彎行為。實驗材種主要為硬槭(Acer spp.),部份為柳杉(Cryptomeria japonica)。硬槭鳩尾榫幾何的變化包括榫寬(W)(30、25、20 mm)、榫長(L)(15、12、9 mm)、榫厚(T)(30、15 mm)及鳩尾斜度(8°、11°、14°、17°、20°)。嵌合度變化有餘隙配合(+0.3 mm)、過渡配合(+0.0 mm)及干涉配合(-0.3 mm)。膠合狀態包括乳膠膠合、尿素膠膠合及未上膠。各組合以單次單因子試驗與標準控制組進行比較,控制組的鳩尾榫使用硬槭、榫寬(W)30 mm、榫長(L)15 mm、榫厚(T)30 mm、鳩尾斜度14°,餘隙配合並以乳膠膠合。每組製作12支試件。就材種而言,硬槭之抗彎力矩顯著大於柳杉的抗彎力矩;但柳杉鳩尾榫的剛性效率反而大於硬槭鳩尾榫的剛性效率。抗彎力矩隨榫長(L)的增長而增加,亦隨嵌合度的緊鬆而增減。榫寬、榫厚、鳩尾斜度及膠合狀態等因子對抗彎力矩無顯著影響。榫寬及膠合狀態對剛性效率具顯著影響,剛性效率隨榫寬(W)的增加而增加。本實驗中,使用乳膠的鳩尾榫的剛性效率大於尿素膠和未上膠的鳩尾榫的剛性效率。其餘因子如榫長、榫厚、鳩尾斜度及嵌合度對剛性效率均無顯著影響。 硬槭鳩尾榫的抗彎破壞模式包含(A)榫孔材縱裂、 (B)榫角剪斷和(C)榫孔材縱裂併同榫角剪斷的混合模式等3種 破壞模式,其中以混合模式的破壞最多,榫孔材縱裂次之。 |
英文摘要 | The purpose of this study was to investigate the bending behavior of dovetail joints. T-type joints were bended as cantilever beam to obtain the bending moment, the joint rigidity efficiency and failure modes for varioust wood species, tenon sizes, dovetail angles, adhesion conditions and fitness levels. The wood species used were mainly hard maple (Acer spp.) and partly Japanese cedar (Cryptomeria japonica). Changes in the geometry of hard maple dovetail joint included tenon width (W) (30, 25, 20 mm), tenon length (L) (15, 12, 9 mm), tenon thickness (T) (30, 15 mm) and five dovetail angles (8°, 11°, 14°, 17°, 20°). Fitness levels included clearance fit (+0.3 mm), transitional fit (+0.0 mm) and interference fit (-0.3 mm). Adhesion conditions included joints glued with polyvinyl acetate (PVAc), joints glued with urea formaldehyde resin (UF) and joints without glue. The experiment design was one-variable-at-a-time. Bending moment and rigidity efficiency of each test combination were compared with the controlled specimen which had tenon width of 30 mm, tenon length of 15 mm, tenon thickness of 30 mm, tail angle of 14° and glued with PVAc. Each test had 12 replicates. The experimental result showed that the hard maple dovetail joints had significantly greater bending moment and smaller efficiency of rigidity than those of Japanese cedar. The bending moment became greater with the increase of the tenon length and tightness of the fitness. Other factors such as tenon width, tenon thickness, dovetail angle and adhesion condition had no significant effect on the bending moment. The joint rigidity efficiency increased with the increase of the tenon width. Dovetail joints glued with PVAc had higher rigidity. Tenon length, tenon thickness, tail angle and fitness had no significant effect on the joint rigidity. The failure modes included (A) a longitudinal split in the mortise, (B) a shearing off in the tenon tip and (C) a mixture of modes A and B. Among these, the most frequent mode was mode C, followed by mode A. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。