查詢結果分析
相關文獻
- Within Trunk Variation of the Strength Property of Wood from Formosan Alder, Long Glans Oak and Formosan Michelia in Taiwan
- 臺灣主要經濟樹種材質之基礎研究(13):臺灣赤楊、錐果櫟及烏心石之誘電率、誘電體力率及電阻係數之變異性
- 臺灣主要經濟樹種材質之基礎研究(14):烏心石、錐果櫟及臺灣赤楊之單面與全面水分移動速度之變異性
- 臺灣主要經濟樹種材質之基礎研究(12):臺灣赤楊、錐果櫟及烏心石之比重、收縮率與纖維飽和點之變異性
- 省產闊葉樹材之重要機械強度性質試驗
- 省產闊葉樹材之重要機械強度性質試驗
- 超音波檢測技術應用於臺灣古蹟大木構件新料擇用之初探
- 錐果櫟幹材之組織構造的研究
- 臺灣赤楊、木荷種子不同溫度貯藏之研究
- 臺灣赤楊之育林
頁籤選單縮合
題 名 | Within Trunk Variation of the Strength Property of Wood from Formosan Alder, Long Glans Oak and Formosan Michelia in Taiwan=臺灣產赤楊、錐果櫟及烏心石樹幹內木材強度性質變異 |
---|---|
作 者 | 唐讓雷; | 書刊名 | 林業試驗所研究報告季刊 |
卷 期 | 10:1 1995.03[民84.03] |
頁 次 | 頁83-91 |
分類號 | 436.18 |
關鍵詞 | 木材性質變異性; 強度性質; 臺灣省產木材; 闊葉樹材; 赤楊; 錐果櫟; 烏心石; Wood variation; Mechanical property; Native wood in Taiwan; Hardwood; Formosa alder; Long glans oak; Formosan michelia; |
語 文 | 英文(English) |
中文摘要 | 木材係一生物材料,由不同大小及形狀細胞組成,這些以及由其隨伴發生之顯微構造差異,為木材性質變異之一主因,因此,隨生長方向、樹種、以及同樹種之單株內而有變異,同時影響其加工利用。本研究就赤楊、錐果櫟及烏心石三種重要木省固有樹種,進行單株內強度性質變異分析,在試驗中,曾取得赤楊、錐果櫟及烏心石各一株,每株均外觀生長優良、不含不正常木質者。結果發現破壞係數以烏心石優於錐果櫟,而赤楊材最弱,但靜力抗壓強度則以錐果櫟材優於烏心石,三樹種中,錐果櫟材比重最大,烏心石材次之楊材最低,綜合各強度性質而言,錐果櫟及烏心石有隨樹高而強度漸減之趨勢,然而赤楊材則隨樹高而漸增,各強度在樹幹之東南西北方位間,並無明顯或一致之變異趨向,由樹心沿年輪至樹皮方向則均顯現增加材料之強度,似拋物線形曲線,惟其間因不同強度性質及樹種而稍有不同,一般而言,赤楊材生長較為迅速,因而其強度性質之變異性亦大於另二種試驗之樹材。 |
英文摘要 | Wood is a biological material and composed of cells of various shapes and sizes. These and the associated changes in the anatomical structure of wood play a major role in the property variations, such as between and within species, growth directions, etc., which have a great effect on the wood utilization. The main purpose of this study is to examine the within trunk variation in the wood strength properties of three important hardwood species native to Taiwan. They are Alnus formosana or Formosan Alder (FA), Cyclobalanopsis longinux or Long Glans Oak (LGO), and Michelia formosana or Formosan Michelia (FM). One tree with straight trunk and no signs of abnormal wood for each species was chosen. The measured DBH values were 60.5, 44.0, and 78.0 cm for FA, LGO, and FM, respectively. Small, clear and streight grained specimen was made from the wood taken from three different heights of each smaple tree trunk. It was found that the MOR of FM wood was stronger than that of LOG. The MOR of FA wood was the weakest among the three. For specific gravity and compression strength, they were shown in decreasing order as LGO, FM, and FA. No consistent variation patterns were found for various strength properties when comparing the results obtained from the different locations, i.e., north, south, east, and west aspect, of the cross section areas at the selected heights of a trunk. The wood strength for FM and LGO showed a decreasing trend with increasing in the trunk height. The reverse was true, however, for FA. From pith toward sapwood, a gradual increase in the strength properties was noted. In general, FA showed a faster rate of growth and larger variation than those of the other two hardwood species tested. |
本系統中英文摘要資訊取自各篇刊載內容。