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首页> 外文期刊>Wood Science and Technology >Influence of bark on the mapping of mechanical strain using digital image correlation
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Influence of bark on the mapping of mechanical strain using digital image correlation

机译：树皮对使用数字图像相关的机械应变映射的影响

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Stereoscopic photogrammetry digital image correlation systems (DIC) are being used to remotely measure deformation and movement in a number of industrial research programs. The incorporation of DIC into ecology, forestry or arboricultural research can help understand how trees and other plants react during static or dynamic biomechanical trials. In the case of deformation, DIC systems map strain which will help understand how a load is transferred from one section of tree to another (i.e., from a branch to the central stem). DIC often utilizes a stochastic paint speckling (contrasting black on white) to create a series of reference points that can be tracked during testing to map strain. During previous field trials, researches have elected to remove the bark and apply the paint directly on the xylem in order to have a smooth or flat surface for the application of speckling. This potentially limits the application of DIC systems only to destructive sampling. Percent strain on Quercus rubra L. stump sprouts was mapped, and no difference between the strains was found whether the bark was intact or removed, suggesting that the presence or absence of bark does not influence strain, at least in thin bark situations. As such, it is not always necessary to remove the bark, opening up the applicability of DIC systems to nondestructive testing in ecological and arboricultural research, inclusive of repeat testing over a series of months or years.
机译：立体摄影测量数字图像相关系统（DIC）在许多工业研究程序中用于远程测量变形和运动。将DIC纳入生态，林业或树木栽培研究可以帮助理解树木和其他植物在静态或动态生物力学试验中的反应。在变形的情况下，DIC系统绘制应变图，这将有助于了解载荷如何从树的一个部分转移到另一部分（即，从树枝到中央茎）。 DIC通常利用随机的油漆斑点（白底黑字对比）来创建一系列参考点，这些参考点可以在测试过程中进行跟踪以绘制应变图。在先前的田间试验中，研究人员选择去除树皮，并将涂料直接涂在木质部上，以使表面光滑或平坦，以进行斑点处理。这潜在地将DIC系统的应用仅限于破坏性采样。绘制了栎栎树桩芽上的菌株的百分含量，并且无论树皮是完整的还是除去的，菌株之间都没有差异，这表明，至少在稀薄的树皮情况下，树皮的存在或不存在均不影响菌株。因此，并非总是必须去除树皮，从而使DIC系统在生态学和树木学研究中的无损检测（包括在数月或数月的重复检测中）的适用性得以开放。

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    《Wood Science and Technology》 |2017年第6期|1469-1477|共9页
  • 作者

    Dahle Gregory A.;

  • 作者单位

    West Virginia Univ, Sch Nat Resources, POB 6125, Morgantown, WV 26508 USA;

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