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Optical coherence elastography for measuring the deformation within glass fiber composite

机译:用于测量玻璃纤维复合材料内部变形的光学相干弹性成像

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摘要

Optical coherence elastography (OCE) has been applied to the study of microscopic deformation in biological tissue under compressive stress for more than a decade. In this paper, OCE has been extended for the first time, to the best of our knowledge, to deformation measurement in a glass fiber composite in the field of nondestructive testing. A customized optical coherence tomography system, combined with a mechanical loading setup, was developed to provide pairs of prestressed and stressed structural images. The speckle tracking algorithm, based on 2D cross correlation, was used to estimate the local displacements in micrometer scale. The algorithm was first evaluated by a test of rigid body translation. Then the experiments were carried out with the tensile test and three point bending on a set of glass fiber composites. The structural features and structural variations during the mechanical loadings are clearly observed with the presented displacement maps. The advantages and prospects for OCE application on glass fiber composites are discussed at the end of this paper.
机译:光学相干弹性成像(OCE)已被用于研究生物组织在压缩应力下的微观变形已有十多年的历史。在本文中,就我们所知,OCE首次扩展到了玻璃纤维复合材料在无损检测领域的变形测量​​。开发了定制的光学相干断层扫描系统,并结合了机械加载设置,以提供成对的预应力和应力结构图像。基于2D互相关的散斑跟踪算法用于估计微米级的局部位移。首先通过刚体平移测试对算法进行评估。然后对一组玻璃纤维复合材料进行拉伸测试和三点弯曲实验。通过所提供的位移图可以清楚地观察到机械载荷期间的结构特征和结构变化。本文最后讨论了OCE在玻璃纤维复合材料上应用的优势和前景。

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