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首页> 外文期刊>Wood and Fiber Science >TENSILE PROPERTIES OF EARLYWOOD AND LATEWOOD FROM LOBLOLLY PINE (PINUS TAEDA) USING DIGITAL IMAGE CORRELATION
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TENSILE PROPERTIES OF EARLYWOOD AND LATEWOOD FROM LOBLOLLY PINE (PINUS TAEDA) USING DIGITAL IMAGE CORRELATION

机译：基于数字图像相关性的松柏早材和阔叶材的拉伸性能

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摘要

The goal of this research was to measure the elastic properties and strength of earlywood and latewood from two growth-ring positions of loblolly pine. Because of the small specimen size, a contact-less strain measurement was applied using a microscope with an appropriate field of view. The tensile properties of the earlywood and latewood were calculated from load data from a Minimat tester coupled with elastic strain data from a digital image correlation technique. Incremental loading was applied until specimen failure occurred. Elastic modulus, Poisson ratio, and strength generally increased as the growth-ring numbers increased, except for the strength of latewood that slightly decreased. Elastic properties and strength were significantly different for different growth-ring positions and intraring layers. The elastic modulus for earlywood and latewood were best fitted by Weibull distributions regardless of growth-ring positions, whereas Poisson ratios were best fitted by Weibull distributions forearlywood 1-10 and latewood 11 - 20 groups, and gamma distributions for earlywood 11 - 20 and latewood 1-10 groups. Strain distribution analysis showed nonuniform strain distributions for the four groups and also showed more resistance to load for earlywood and latewood from a higher growth-ring position.
机译：这项研究的目的是从火炬松的两个生长环位置测量早材和晚材的弹性和强度。由于样品尺寸小，因此使用具有适当视场的显微镜进行非接触式应变测量。早材和晚材的拉伸性能是根据Minimat测试仪的载荷数据以及数字图像相关技术的弹性应变数据计算得出的。施加增量载荷直到发生样品破坏。弹性模量，泊松比和强度通常随年轮数的增加而增加，除了胶木的强度略有下降。对于不同的生长环位置和环内层，弹性性能和强度显着不同。无论生长环的位置如何，早木和晚木的弹性模量最适合于威布尔分布，而泊松比最适合早木1-10和晚木11-20组的威布尔分布，以及伽玛分布用于早木11-20和晚木1-10组。应变分布分析显示四组的应变分布不均匀，并且从较高的生长环位置显示出对早木和晚木的更大抵抗力。

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