Fringe 2013 - 7th International Workshop on Advanced Optical Imaging and Metrology
Fringe 2013 - 7th International Workshop on Advanced Optical Imaging and Metrology
复制标题
2013边缘艺术节 - 第七届先进光学成像与计量国际研讨会
DOI：
10.1007/978-3-642-36359-7_21
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Nguyen T
中科院分区：
文献类型：
--
作者：
Nguyen T
零件制造缺陷或使用中损坏的检查通常通过全场光学技术(例如，数字散斑干涉法、数字全息术)进行，其中高灵敏度允许测量载荷引起的变形场中的微小异常。标准相移和相位展开算法提供全场位移，从而提供样品表面的应变数据。然而，问题仍然是如何量化弹性模量的空间变化，例如，由于孔隙率或损伤导致的微裂缝。有限元模型修正(FEMU)是解决这类问题的一种方法，它通过调整近似的有限元模型，使其产生的响应尽可能接近于实验所获得的响应。
Inspection of parts for manufacturing defects or in-service damage is often carried out by full-field optical techniques (e.g., digital speckle pattern interferometry, digital holography) where the high sensitivity allows small anomalies in a load-induced deformation field to be measured. Standard phase shifting and phase unwrapping algorithms provide full-field displacement and hence strain data over the surface of the sample. The problem remains however of how to quantify the spatial variations in modulus due, for example, to porosity or damage-induced micro-cracking. Finite element model updating (FEMU) is one method to solve problems of this type, by adjusting an approximate finite element model until the responses it produces are as close to those acquired from experiments as possible.