A benchmark strategy for the experimental measurement of contact fabric
A benchmark strategy for the experimental measurement of contact fabric
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DOI：
10.1007/s10035-019-0902-x
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发表时间：
2019-06
期刊：
影响因子：
2.4
通讯作者：
Max Wiebicke;E. Andò;V. Šmilauer;I. Herle;G. Viggiani
中科院分区：
文献类型：
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作者：
Max Wiebicke;E. Andò;V. Šmilauer;I. Herle;G. Viggiani
通过对织物的实验测量及其在载荷作用下的演化，可以更好地了解颗粒材料的力学性质。X射线层析成像是一种越来越多地用于获取三维图像的工具，从而使这种测量成为可能。我们之前对颗粒间接触的计量学研究表明，最常见的方法要么无法准确测量接触织物，要么引入强烈的偏差。提出了改进这些测量(即接触的检测和定位)的方法，并进行了验证。这项工作开发了一种策略，以基准图像分析工具，可用于确定断层图像接触织物。离散单元法用于创建和加载准确知道织物及其演变的参考样品。考虑到固有的图像属性，例如部分体积效应、模糊和噪声，这种合成样品的选择状态被转换成真实的图像。图像分析工具在这些图像上的应用证实了计量研究的结果，并强调了解决已查明的缺陷的重要性，即在使用公共分水岭时系统地过度检测接触和强烈的定向偏差。
The mechanics of granular materials can be better understood by experimental measurement of fabric and its evolution under load. X-ray tomography is a tool that is increasingly used to acquire three-dimensional images and thus, enables such measurements. Our previous study on the metrology of interparticle contacts revealed that the most common approaches either fail to accurately measure contact fabric or introduce a strong bias. Methods to improve these measurements (i.e., the detection and orientation of contacts) were proposed and validated. This work develops a strategy to benchmark image analysis tools that can be used for the determination of contact fabric from tomographic images. The discrete element method is used to create and load a reference specimen for which the fabric and its evolution is precisely known. Chosen states of this synthetic specimen are turned into realistic images taking into account inherent image properties, such as the partial volume effect, blur and noise. The application of the image analysis tools on these images validates the findings of the metrological study and highlights the importance of addressing the identified shortcomings, i.e., the systematical over-detection of contacts and the strong bias of orientations when using common watersheds.