3D micro-scale deformations of wood in bending: Synchrotron radiation μCT data analyzed with digital volume correlation
3D micro-scale deformations of wood in bending: Synchrotron radiation μCT data analyzed with digital volume correlation
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DOI：
10.1016/j.jsb.2008.08.004
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发表时间：
2008-12-01
影响因子：
3
通讯作者：
Wyss, P.
中科院分区：
文献类型：
--
作者：
Forsberg, F.;Mooser, R.;Wyss, P.
采用同步辐射微计算机断层扫描技术对木材试件进行了微尺度三点弯曲实验。在不同加载状态下，在细胞水平上重建了1.57 x 3.42 x 0.75 mm(3)试件的全三维木结构。在此基础上，采用数字体积相关方法确定了加载木材试件的三维变形场，并将其应用于连续加载状态下的重建数据。木材试样内两个选定区域的结果呈现为二维和三维的连续位移和应变场。将同步辐射微计算机断层扫描技术与数字体积相关技术相结合用于木材弯曲应力变形分析是木材材料科学中的一项新应用。该方法提供了在原位微力学实验中同时观察结构变化和量化变形的潜力。此外，高空间分辨率允许研究解剖特征对木材断裂行为的影响。该方法的可能应用范围从新鲜植物组织的生物力学观察到结构木材的断裂力学方面。(C) 2008爱思唯尔公司版权所有。
A micro-scale three-point-bending experiment with a wood specimen was carried out and monitored by synchrotron radiation micro-computed tomography. The full three-dimensional wood structure of the 1.57 x 3.42 x 0.75 mm(3) specimen was reconstructed at cellular level in different loading states. Furthermore, the full three-dimensional deformation field of the loaded wood specimen was determined by digital volume correlation, applied to the reconstructed data at successive loading states. Results from two selected regions within the wood specimen are presented as continuous displacement and strain fields in both 2D and 3D. The applied combination of synchrotron radiation micro-computed tomography and digital volume correlation for the deformation analysis of wood under bending stress is a novel application in wood material science. The method offers the potential for the simultaneous observation of structural changes and quantified deformations during in situ micro-mechanical experiments. Moreover, the high spatial resolution allows studying the influence of anatomical features on the fracture behaviour of wood. Possible applications of this method range from bio-mechanical observations in fresh plant tissue to fracture mechanics aspects in structural timber. (C) 2008 Elsevier Inc. All rights reserved.