Effect of Size on Tension Perpendicular-To-Grain Strength of Douglas-Fir
Effect of Size on Tension Perpendicular-To-Grain Strength of Douglas-Fir
复制标题
尺寸对花旗松垂直纹理拉伸强度的影响
DOI：
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发表时间：
2007
影响因子：
1.4
通讯作者：
J. D. Barrett
中科院分区：
文献类型：
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作者：
J. D. Barrett
几位作者对木材垂直于纹理拉伸的强度进行了研究，发现其取决于试件的几何形状。本文应用最弱环概念预测了垂直于颗粒均匀拉伸下的道格拉斯-冷杉试件的体积与承载能力之间的关系。该理论允许预测最大强度的对数应随体积的对数线性下降。用文献中的实验数据对理论模型进行了评价，发现符合程度较高(R2≥为0.85)。单位体积的平均强度约为460磅/平方英寸，而10-X 10-X 20英寸试件(2000英寸3)的预计强度约为100磅/平方英寸。尺寸效应的大小可能取决于试件中材料的质量，但可以肯定的是，任何垂直于颗粒拉伸的工作应力的合理发展都必须考虑试件(或结构部件)尺寸的影响。
The strength of wood in tension perpendicular-to-grain has been studied by several authors and found to depend on specimen geometry. In this paper, the weakest-link concept has been applied to predict the relationship between specimen volume and load-carrying capacity for Douglas-fir specimens loaded in uniform tension perpendicular-to-grain. The theory allowed the prediction that logarithm of maximum strength should decrease linearly with logarithm of volume. Experimental data taken from the literature were used to evaluate the theoretical model and agreement was found to be high (R 2 ≥ 0.85). Average strength of a unit volume is approximately 460 psi, whereas the predicted strength of a 10- X 10- X 20-inch specimen (2000 inches 3 ) is approximately 100 psi. The magnitude of the size effect may depend on the quality of material in the specimens, but certainly any rational development of working stresses for tension perpendicular-to-grain must consider effects of specimen (or structural component) size.