Quantitative Fiber Orientation Analysis of Carbon Fiber Sheet Molding Compounds using Polarization Imaging and X-Ray Computed Tomography

This data set is the supplementary material for the paper[1] M. Duhovic, A. Keilmann, D. Schommer, C. Redenbach, K. Schladitz, 2024. Quantitative Fiber Orientation Analysis of Carbon Fiber Sheet Molding Compounds using Polarization Imaging and X-Ray Computed Tomography.Here, we validated polarization imaging of carbon sheet molding compounds (C-SMC) for fiber orientation estimation.It includes polarization and computed tomography (CT) images of 8 C-SMC specimens. Polarization images: Each specimen has 2 polarization images, one for the top surface and one for the bottom surface, representing the local fiber orientation. The fiber orientations are coded as integer values in degrees, ranging from 1° to 180°, with 0 indicating the image background. The orientation system is anti-clockwise with 0° aligned with the negative y-axis. For example, rotating 30° anti-clockwise from the direction of the x-axis yields 120°. The images are of size 1232x1028 pixels with a pixel spacing of 210 um (filetype: TIF). CT scans: Nine tiles were cut from each specimen, and each tile was scanned using CT to capture the fibers. We provide the aligned x-y-slices of size 1520x1520 with a voxel spacing of 25 um (filetype: PNG). Fiber orientations: The dataset also includes fiber orientations (only within the x-y-plane) derived from the CT images. The fiber orientations are coded as integer values in degrees, ranging from 1° to 180°, with 0 indicating the image background. The orientation system is clockwise with 0° aligned with the negative x-axis. For example, rotating 30° anti-clockwise from the direction of the x-axis yields 150°. These images are 1440x1440 pixels with a voxel spacing of 25 um (filetype: TIF). The fiber orientations were calculated using methods described in the accompanying paper. Note: The images' orientation system differs from the one of the polarization images. This is taken into account in the accompanying code and analyses. Source code: The dataset is processed with a jupyter notebook to register the polarization and CT images and calculate the final similarity measure. Density analysis was conducted in R. Both the jupyter notebook and the R Notebook contain the results for each specimen. ----------------------------------------------------------------------------- For each investigated specimen (stored in directories labeled C-SMC_*), the dataset is structured as follows: polarization_image/: Contains two polarization images for each specimen, representing the top (*t.bmp) and bottom (*b.bmp) surfaces.Example:C-SMC_19/polarization_image/19t.tif (top surface)C-SMC_01/polarization_image/19b.tif (bottom surface) CT/: Contains CT image slices of the CT, organized by tile for each specimen. Each tile consists of multiple x-y aligned slices.Example:C-SMC_19/CT/tile1/Slice000.pngC-SMC_19/CT/tile1/Slice001.pngC-SMC_19/CT/tile2/Slice000.png fiber_orientations/: Contains the fiber orientation results calculated from the CT images for each tile of the specimen.Example:C-SMC_19/fiber_orientations/tile1/Slice000.tifC-SMC_19/fiber_orientations/tile1/Slice001.tifC-SMC_19/fiber_orientations/tile2/Slice000.tif The source code is stored in the directory src. For more details, refer to [1].本数据集为论文[1] M. Duhovic, A. Keilmann, D. Schommer, C. Redenbach, K. Schladitz, 2024. 《基于偏振成像与X射线计算机断层扫描的碳纤维片材模压复合材料定量纤维取向分析（Quantitative Fiber Orientation Analysis of Carbon Fiber Sheet Molding Compounds using Polarization Imaging and X-Ray Computed Tomography）》的补充材料。本工作验证了碳纤维片材模压复合材料（Carbon Fiber Sheet Molding Compounds, C-SMC）的偏振成像（Polarization Imaging）用于纤维取向估计的可行性。数据集包含8个C-SMC试样的偏振成像与计算机断层扫描（Computed Tomography, CT）图像。 偏振图像：每个试样配有2张偏振图像，分别对应试样的上表面与下表面，用于表征局部纤维取向。纤维取向以整数度数编码，取值范围为1°至180°，0代表图像背景。取向坐标系采用逆时针方向，0°与负y轴对齐。例如，从x轴方向逆时针旋转30°，对应的编码值为120°。图像分辨率为1232×1028像素，像素间距为210 μm，文件格式为TIF。 CT扫描：从每个试样上切割9个样本块（tile），并对每个样本块进行CT扫描以捕捉纤维分布。本数据集提供对齐后的x-y平面切片，分辨率为1520×1520，体素间距为25 μm，文件格式为PNG。 纤维取向数据：数据集还包含从CT图像中提取的纤维取向信息（仅x-y平面内）。纤维取向以整数度数编码，取值范围为1°至180°，0代表图像背景。取向坐标系采用顺时针方向，0°与负x轴对齐。例如，从x轴方向逆时针旋转30°，对应的编码值为150°。此类图像分辨率为1440×1440像素，体素间距为25 μm，文件格式为TIF。纤维取向通过配套论文中描述的方法计算得到。注意：CT纤维取向图像的坐标系与偏振图像的坐标系存在差异，该差异已在配套代码与分析流程中完成校正。 源代码：本数据集通过Jupyter Notebook完成处理，用于配准偏振图像与CT图像并计算最终相似度指标。密度分析通过R语言完成。Jupyter Notebook与R Notebook中均包含每个试样的分析结果。 ----------------------------------------------------------------------------- 针对每个待研究的试样（存储于命名为C-SMC_*的目录中），数据集的组织结构如下： polarization_image/：包含每个试样的2张偏振图像，分别对应上表面（命名格式为* t.bmp）与下表面（命名格式为* b.bmp）。示例：C-SMC_19/polarization_image/19t.tif（上表面）；C-SMC_01/polarization_image/19b.tif（下表面）。 CT/：包含试样的CT图像切片，按每个试样的样本块组织。每个样本块包含多张x-y对齐的切片。示例：C-SMC_19/CT/tile1/Slice000.png；C-SMC_19/CT/tile1/Slice001.png；C-SMC_19/CT/tile2/Slice000.png。 fiber_orientations/：包含从每个试样的各样本块的CT图像中计算得到的纤维取向结果。示例：C-SMC_19/fiber_orientations/tile1/Slice000.tif；C-SMC_19/fiber_orientations/tile1/Slice001.tif；C-SMC_19/fiber_orientations/tile2/Slice000.tif。 源代码存储于src目录中。 更多细节请参阅文献[1]。