Advances in Micro-CT aided numerical simulation of fabric-reinforced composites
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摘要: 精确的数值模型是获得可靠的数值仿真结果的前提。显微计算机断层扫描(Micro-CT)技术可无损成像复合材料的内部结构,据此建立的数值模型比理想化模型更具代表性。本文综述了基于Micro-CT图像的复合材料介观模型构建方法及其在材料虚拟测试中的应用,提出了Micro-CT辅助数值仿真的概念。首先,对Micro-CT成像原理、设备特点和织物增强复合材料的成像难点进行了讨论。其次,梳理了现有的Micro-CT辅助建模技术的特点,将其建立的模型划分为间接模型、体素模型和数字材料孪生模型,重点介绍了构建各类模型的理论基础和技术途径,指出了各自的优势和局限性。然后对Micro-CT辅助数值仿真技术在织物增强复合材料的成型工艺和力学性能预测等方面的应用进行了总结,表明了该技术的重要价值。最后,对Micro-CT辅助数值仿真技术的未来发展进行了展望。Abstract: Reliable numerical simulation results depend on the use of accurate numerical models. Micro-computed tomography (Micro-CT) technology is capable of non-destructively imaging the internal structure of composite materials, hence, numerical models reconstructed from it are more representative than the idealized ones. Here, a review is presented for constructing mesoscopic models of composite materials based on Micro-CT images and its application in virtual testing. A novel concept, Micro-CT aided numerical simulation, is proposed. First, the principle of Micro-CT imaging, the characteristics of equipment, and the difficulties with scanning fabric-reinforced composites are discussed. Second, the characteristics of existing Micro-CT aided modeling techniques are analyzed and compared. The models are divided into three types including indirect, voxel, and digital material twin ones. The theoretical basis and technical approaches for constructing each type of model are highlighted, and the advantages and limitations of each are analyzed. Then recent applications of Micro-CT aided numerical simulation in composite molding process and mechanical property prediction of fabric reinforced composites are summarized, showing the potential and importance of the technology. Finally, the future of Micro-CT aided numerical simulation technology is anticipated.
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Key words:
- fabric-reinforced composites /
- Micro-CT /
- numerical simulation /
- image reconstruction /
- digital twin
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表 1 Micro-CT 图像预处理和图像分割方法
Table 1. Micro-CT image pre-processing and image segmentation methods
Textile Resolution/$ \mathrm{\mu }\mathrm{m} $ Denosing Smoothing Segmentation Software Reference Plain weave 10.4 / / Manual segmentation VG studio [67] 25 Pixel intensity averaged with neighbors Sobel operator & Structure tensor MATLAB [77] 1 - 10 Median filter Threshold-texture feature-morphology / [78] 5 A 1 D uniform filter Morphological gradient & Deep Learning ImageJ & SciPy [82] 18.6 Non-local mean filter thresholding based on seed
region growingAvizo [83] 5-directional braided composite 22.1 √ √ √ VG studio/ImageJ [65] Fiber tow 9.3 / Nugget effect Implicit kriging & Indicator function In-house Python code [84] 3 D fabric 2 Median filter Texture analysis / [74] / Gaussian smoothing Structure tensor & Signed distances MATLAB [64] Note: “/” means information of the item was not given by authors, while “√” means the item was done but the method was not given. 表 2 五种常用的多孔介质渗流力学求解器
Table 2. Five commonly used solvers for percolation mechanics in porous media
Category Governing equation Meshing software Reference Computational Fluid Dynamic (CFD) Stokes and Navier-Stokes equations on discretized grid mesh Yes Fluent, OpenFOAM, et al, [92,110,111] Lattice-Boltzmann Method (LBM) Boltzmann equation on voxel mesh No OpenLB et al. [112,113] Voxel Based direct Navier-Stokes
Solvers (VBS)Stokes and Navier-Stokes equations on segmented Micro-CT images No VG studio, Avizo et al. [73,105,107,109,114] Semi-Analytical Solvers (SAS) Analytical up-scaling solutions No / [115] Empirical Kozeny–Carman type
model (EMP)pore size distribution extracted from No / [5,88] -
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