Cracks play an essential role in the degradation of the thermomechanical behavior of ceramic matrix composites. However, characterizing their complex 3D geometries within a complex microstructure is still a challenge. This paper presents a series of procedures, based on X-ray tomographic images, to evaluate the applied 3D strains, including their through-thickness gradients, and to detect and quantify the induced crack networks in ceramic matrix composites. Digital volume correlation and some dedicated image processing algorithms are employed. A novel method is proposed to estimate the opening, orientation and surface area of the detected cracks. The proposed procedures are applied to the images of a SiC/SiC composite tube that has been tested in situ under uniaxial tension with synchrotron X-ray computed tomography.

中文翻译：

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使用 X 射线计算机断层扫描对陶瓷基复合管中的裂纹进行 3D 检测和定量表征

裂纹在陶瓷基复合材料热机械性能的退化中起着至关重要的作用。然而，在复杂的微观结构中表征其复杂的 3D 几何形状仍然是一个挑战。本文介绍了一系列基于 X 射线断层扫描图像的程序，以评估施加的 3D 应变，包括它们的厚度梯度，并检测和量化陶瓷基复合材料中的诱导裂纹网络。采用了数字体积相关和一些专用的图像处理算法。提出了一种估计检测裂纹的开口、方向和表面积的新方法。所提出的程序应用于已使用同步加速器 X 射线计算机断层扫描在单轴张力下原位测试的 SiC/SiC 复合管的图像。