Combination of FEM simulations and shearography for defect detection on artwork
Combination of FEM simulations and shearography for defect detection on artwork
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DOI：
10.1111/str.12269
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发表时间：
2018-06
期刊：
影响因子：
2.1
通讯作者：
D. Buchta;C. Heinemann;G. Pedrini;C. Krekel;W. Osten
中科院分区：
文献类型：
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作者：
D. Buchta;C. Heinemann;G. Pedrini;C. Krekel;W. Osten
数字剪切散斑术是一种干涉技术，常用于复合材料结构的缺陷检测。测量快速且非破坏性，因此适合应用于文化遗产。然而，该技术的一个主要缺点是间接测量，因为表面应变用于检测表面下的缺陷。因此，确定缺陷的深度、大小和类型是相当困难的。为了克服这个问题，我们使用有限元法模拟和剪切测量相结合。由于两个数据集的比较，可以以更可靠的方式解决反问题。在本文中，我们研究了有限元模拟的各向异性材料的一种改进的缺陷检测的应用。我们验证了背面有缺口的木制样品上的技术。
Digital shearography is an interferometric technique, which is often used for defect detection on composite structures. The measurement is fast and non‐destructive and thus suitable for the application to cultural heritage. However, a major drawback of the technique is the indirect measurement, because surface strain is used to detect subsurface defects. So the determination of depth, size, and type of the defects is rather difficult. To overcome this issue, we use a combination of finite element method simulation and shearographic measurement. Due to the comparison of both data sets, the inverse problem can be solved in a more reliable way. In this paper, we investigate the application of finite element method simulation for an improved defect detection on anisotropic material. We validate the technique on a wooden sample with notches on the backside.