Modelling method of fibre distribution in steel fibre reinforced concrete based on X-ray image recognition
Modelling method of fibre distribution in steel fibre reinforced concrete based on X-ray image recognition
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DOI：
10.1016/j.compositesb.2021.109124
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发表时间：
2021-07-14
影响因子：
13.1
通讯作者：
Lim, Sopokhem
中科院分区：
文献类型：
--
作者：
Li, Yue;Ruan, Xin;Lim, Sopokhem
钢纤维混凝土（SFRC）准确高效的模拟对其在土木工程中的进一步应用具有重要意义。现有建模方法的问题可以归纳为两点： （1）积分模型仅简化了纤维对混凝土单元中统一峰后延性的贡献，但不能反映真实纤维分布引起的材料变化；（2）分离模型分别构建了混凝土基体和纤维夹杂物，但直接随机纤维分布仍需要根据实际材料进行细化。本文基于真实钢纤维混凝土材料的X射线图像识别结果，提出了用于钢纤维混凝土仿真的纤维分布和取向的数学模型，并对几何参数的详细值分布进行了优化，以方便和准确地进行材料建模。在X射线图像中近4000条纤维的几何提取中，利用像素语义分类、霍夫变换等技术，提出了图像处理、增强和识别的整个综合流程。通过所提出的几何数学模型，通过机械应用说明了由多次细化采样组成的建模方法。通过实验对比对模型进行验证后，还讨论了钢纤维的详细贡献以及纤维分布细化的效果。
The accurate and efficient simulation of steel fibre reinforced concrete (SFRC) is of great significance for its further application in civil engineering. Problems of existing modelling methods can be recognized as two points; (1) the integral model only simplified fibre contribution into the unified post-peak ductility in concrete element but cannot reflect the material variation caused by real fibre distribution, and (2) the separate model built the concrete matrix and fibre inclusions respectively, but the directly random fibre distributions still need to be refined based on the actual material. In this paper, based on the X-ray image recognition results from real SFRC material, a mathematical model of fibre distribution and orientation is proposed for SFRC simulation, and the detailed value distributions of geometrical parameters are optimized for convenience and accuracy of material modelling. In the geometrical extraction of near 4000 fibres from X-ray images, the whole comprehensive procedure of image processing, enhancement and recognition is presented with technologies like pixel semantic classification and Hough transform. With the proposed geometrical mathematical model, the modelling method that consists of multiple refined sampling is illustrated with mechanical applications. After the model verification by experimental comparison, the detailed contribution of steel fibre and the effect of fibre distribution refinement are discussed as well.