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Assessment of the effects of density on the mechanical properties variations of Borassus aethiopum

机译：评估密度对鲍鱼（Bassus aethiopum）力学性能变化的影响

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The effect of density variation on the mechanical properties of Borassus aethiopum was assessed. Five trees were selected from the transitional zone in Ghana.“Wood” samples were collected from the three distinct zone of the tree: the dermal zone, sub-dermal zone, and the central at 15%, 30%, 45%, 60%, 75% and 90% of the tree merchantable height. One-half of the boards were used in the green state and the other half air dried for the dry tests. Mechanical strength test specimens and Density were prepared and tested in accordance with the British Standard BS 373:1957.The mean basic density and [density at 12%MC]for each of the zones in Kg/m3were 636.0 [793.3], 476.4 [579.1], and 251.2 [293.9] respectively. The mean strength values in N/mm2 in the ‘green’ [and dry] conditions for the dermal zone, sub-dermal zone, and central zone were carried on Modulus of Rupture, Modulus of Elasticity, Compression parallel to the grain, Shear parallel to the grain: 8.53 [11.64], 5.36 [7.74 ], and 1.15[1.80]; Hardness in kNW here as the “wood” density and mechanical properties increased from the central zone to the dermal zone, they however decreased from base to top at any particular height. There was a good correlation between the Density and the various mechanical strength values at (p 0.001).Hence “wood” density can be used in predicting the mechanical properties of Borassus aethiopum wood.
机译：评估了密度变化对鲍鱼（Bassus aethiopum）机械性能的影响。从加纳过渡区选择了五棵树。从树木的三个不同区域收集了“木材”样品：真皮区，皮下区和中央区，分别为15％，30％，45％，60％ ，适销树高的75％和90％。一半的电路板以绿色状态使用，另一半空气干燥以进行干燥测试。机械强度测试样品和密度根据英国标准BS 373：1957进行制备和测试。每个区域的平均基本密度和[在12％MC下的密度] Kg / m3分别为636.0 [793.3]，476.4 [579.1] ]和251.2 [293.9]。真皮区域，皮下区域和中央区域在“绿色” [和干燥]条件下的平均强度值（N / mm2）以破裂模量，弹性模量，平行于谷物的压缩模量，平行于剪切的模量进行计算晶粒：8.53 [11.64]，5.36 [7.74]和1.15 [1.80];这里的硬度以kNW为单位，从中心区域到真皮区域的“木材”密度和机械性能有所提高，但是在任何特定高度，它们从底部到顶部的硬度都降低了。在（p <0.001）时，密度与各种机械强度值之间具有良好的相关性。因此，“木材”密度可用于预测刺槐木的力学性能。

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