Quantitative evaluation of angular defects by pulsed eddy current thermography
Quantitative evaluation of angular defects by pulsed eddy current thermography
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DOI：
10.1016/j.ndteint.2010.05.010
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发表时间：
2010-10-01
影响因子：
4.2
通讯作者：
Almond, Darryl
中科院分区：
文献类型：
--
作者：
Abidin, Ilham Zainal;Tian, Gui Yun;Almond, Darryl
脉冲涡流（PEC）热成像采用PEC和热成像无损检测（NDT）技术的组合。本研究考虑了PEC热成像技术获取与表面成一定角度的裂纹的定量信息的能力。通过时间步进三维有限元分析（FEA）模拟角槽的瞬态热分布，并进行实验验证。提取了瞬态温度分布的斜率倾斜特征，并提出了用于估计与样品内部的槽深和长度无关的槽角的方法。通过识别狭槽角度，然后可以通过最大温度幅度特征来量化样品内狭槽的长度/深度。实验研究已经进行了评价的数值模拟和瞬态特征提取方法。(C)2010爱思唯尔有限公司保留所有权利。
Pulsed eddy current (PEC) thermography employs a combination of PEC and thermographic non-destructive testing (NDT) techniques. This study considers the capabilities of PEC thermography for obtaining quantitative information about cracks set at an angle to the surface. The investigation is implemented by simulating the transient thermal distribution for angular slots, via time-stepping 3D finite element analysis (FEA), with the experimental work undertaken for verification. A slope inclination feature of the transient temperature distribution has been extracted and presented for estimating the angle of slots that is independent of slot depth and length inside the sample. With the identification of the slot angle, quantification of the length/depth of the slot inside the sample can then be made through a maximum temperature amplitude feature. Experimental studies have been undertaken for evaluation of the numerical simulation and transient feature extraction methods. (C) 2010 Elsevier Ltd. All rights reserved.