In this paper, voxel-based finite element modelling based on spatial geometry and density data is applied to simulate the detailed stress and strain distribution in a large wood element. As example, a moulded wooden tube with a length of 3 m and a diameter of 0.3 m is examined. Gamma-ray computed tomography is used to obtain both, its actual geometric shape and spatial density distribution. Correlation functions (R² ≈ 0.6) between density and elastic material properties are experimentally determined and serve as link for defining the non-uniform distribution of the material properties in the finite element model. Considering the geometric imperfections and spatial variation of the material properties, a detailed analysis of the stress and strain distribution of a wood element is performed. Additionally, a non-destructive axial compression test is applied on the wooden tube to analyse the load-bearing behaviour. By means of digital image correlation, the deformation of the surface is obtained, which also serves for validation of the finite element model in terms of strain distributions.

中文翻译：

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基于空间密度和几何数据的计算机体层摄影术基于Voxel的木材元素有限元建模

在本文中，基于空间几何和密度数据的基于体素的有限元建模被用于模拟大型木材元素中详细的应力和应变分布。例如，检查了长度为3 m，直径为0.3 m的模制木管。伽马射线计算机断层扫描用于获得其实际几何形状和空间密度分布。相关函数（R ² 通过实验确定密度和弹性材料特性之间的≈0.6），并用作定义有限元模型中材料特性的非均匀分布的链接。考虑到材料特性的几何缺陷和空间变化，对木质元件的应力和应变分布进行了详细分析。另外，在木管上进行了无损轴向压缩试验，以分析承重行为。通过数字图像相关性，可以获得表面的变形，这也可用于根据应变分布验证有限元模型。