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題名 | 含水率、適割期及草莖部位對狼尾草莖彎曲特性之影響=Effects of Moisture Content, Maturity Age and Stem Level on the Bending Characteristics of Napier Grass Stems |
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作者 | 連振昌; 劉宏偉; 林正亮; 洪滉祐; | 書刊名 | 台灣農學會報 |
卷期 | 14:1 2013.02[民102.02] |
頁次 | 頁53-65 |
分類號 | 434.4 |
關鍵詞 | 狼尾草莖; 含水率; 適割期; 草莖部位; Napier grass stem; Maturity age; Moisture content; Stem level; |
語文 | 中文(Chinese) |
中文摘要 | 狼尾草莖利用物性分析儀進行三點彎曲試驗,由力量位移圖得到彎曲力量, 探討在不同的含水率、適割期及草莖部位條件下,其對狼尾草莖之彎曲應力及彈 性模數之影響。由實驗結果與分析可得:狼尾草莖之的彎曲應力及彈性模數均隨 含水率的增加而減低,而隨適割期的增長而提高,以狼尾草莖的下部位草莖有較 高的彎曲應力及彈性模數,上、中、下部位草莖之彎曲應力及彈性模數彼此間均 有顯著差異;在適割期為 50 天時,狼尾草下部位草莖的彎曲應力σb (MPa) 對濕基含水率 M wb (%) 的線性迴方程式σb = -1.78×M wb + 12.68,決定係 數 R 2= 0.90, 而 彈 性 模 數 E (MPa) 對含 水 率 M wb 的 指 數 迴 歸 方 程 式 E = 228.96×exp (-0.373M wb ),決定係數 R 2= 0.95。 |
英文摘要 | Three bending tests of Napier grass stems were conducted at the forage stage using a universal testing machine. The stem specimens were deformed to obtain the bending force from the force-displacement curve. The effects of bending stress and elasticity modulus of Napier grass stems were investigated a different moisture contents, maturity age and stem levels. The result showed that the bending stress and elasticity modulus of Napier grass stems decreased as moisture content was increased and both increased as maturity age was increased. Higher bending stress and elasticity modulus were found at lower stem levels. The bending stress and elasticity modulus of the Napier grass stems showed significantly different results at upper, middle and lower level. When the maturity age of the lower stems of Napier grass is at 50 days, the linear regression formula is σb = -1.78×Mwb + 12.68 and the determination coefficient is R 2= 0.90. Where σb (MPa) is the bending stress, Mob (%) is the moisture content, the exponent regression formula is E = 228.96×exp (-0.373M wb ) and the determination coefficient is R 2= 0.95. |
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