Quantitative Evaluation of the Relationship between Strain and Color Change in Opal Photonic Crystal Films and Application into Complex Specimen Geometries
Quantitative Evaluation of the Relationship between Strain and Color Change in Opal Photonic Crystal Films and Application into Complex Specimen Geometries
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DOI：
10.2355/isijinternational.isijint-2022-054
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发表时间：
2022
影响因子：
1.8
通讯作者：
Yutao Zhou;Zhipeng Yang;M. Koyama;Saya Ajito;Tomohiko Hojo;H. Fudouzi;E. Akiyama
中科院分区：
文献类型：
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作者：
Yutao Zhou;Zhipeng Yang;M. Koyama;Saya Ajito;Tomohiko Hojo;H. Fudouzi;E. Akiyama
利用数字图像相关分析技术对蛋白石光子晶体薄膜（OPCF）变形后的颜色变化进行了定量研究。将OPCF粘贴在三种不同规格几何形状的试样上，并在每个试样的相对侧上形成随机图案用于DIC分析。为了评估使用基于OPCF的应变表征分析钢结构部件和相关冶金分析的适用性，在本研究中对光滑、宽度梯度和有孔试样进行了预处理。随着光滑试样中变形的增加，OPCF的颜色发生显著变化。通过色调值分析，可以将OPCF中的颜色变化定量地转换为应变值。异质应变分布也可以使用基于OPCF的分析在亚毫米或毫米尺度上进行定量分析。当应变梯度太高时，例如，在应力集中部位（诸如孔）附近，可能发生OPCF从试样表面的局部剥离。因此，对于定量表征，我们在测量“应变梯度”的上限以及应变时必须小心，这取决于试样的粘附力和表面状况。
The color change of opal photonic crystal films (OPCFs) due to deformation was quantitatively evaluated using digital image correlation (DIC) analysis. OPCFs were pasted on specimens of three different gauge geometries, and random patterns were formed on the opposite side of each specimen for DIC analysis. To assess the applicability of using OPCFs-based strain characterization for analyzing steel structural components and associated metallurgical analyses, smooth, width-gradient, and holed specimens were pre-pared in this study. As deformation increased in the smooth specimen, the color of the OPCFs changed significantly. The color change in the OPCFs could be quantitatively converted into strain values through Hue value analysis. Heterogeneous strain distributions could also be quantitatively analyzed using OPCFs-based analysis at the submillimeter or millimeter scale. When the strain gradient is too high, for example, near a stress concentration site such as a hole, local peeling of the OPCFs away from the specimen surface can occur. Consequently, for quantitative characterization, we must take proper care when measuring this upper limit of the “strain gradient” as well as strain, which would depend on the adhesion and surface condition of the specimen.