MECHANISMS AND MODELS FOR CRACK DETECTION WITH INDUCTION THERMOGRAPHY
MECHANISMS AND MODELS FOR CRACK DETECTION WITH INDUCTION THERMOGRAPHY
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DOI：
10.1063/1.2902698
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
Johannes Ludwig Vrana;M. Goldammer;J. Baumann;M. Rothenfusser;W. Arnold
中科院分区：
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作者：
Johannes Ludwig Vrana;M. Goldammer;J. Baumann;M. Rothenfusser;W. Arnold
感应热像仪是一种非接触、无损的检测方法，有着广泛的应用前景。要更深入地了解裂纹的可探测性，需要了解被测部件中感应电流密度分布的基本知识。电流分布的计算提供了以下信息：在组件的哪个位置流过多少电流，裂纹如何干扰电流密度，在组件的哪个位置产生多少热量，以及热量如何扩散到表面。加热过程取决于裂纹的类型。一方面，由于电流密度的增加，主要通过直接观察加热过程可以检测到裂纹；另一方面，由于热扩散的修正，可以检测到主要是可以检测到的裂纹。本文提出了一种计算电流分布的解析模型，包括回流电流和有限元计算。F.。
Induction thermography is a non‐contacting, non‐destructive evaluation method with a wide range of applications. A deeper understanding of the detectability of cracks requires fundamental knowledge about the induced current density distribution in the component under test. A calculation of the current distribution provides information how much current is flowing at which location of the component, how a crack disturbs the current density, how much heat is produced at which location of the component, and how the heat diffuses to the surface. The heating process depends on the type of crack. On the one hand there are cracks which can be detected mainly by direct observation of the heating process due to an increased current density, and on the other hand there are cracks which can be detected mainly because of a modification of the heat diffusion. This paper presents an analytical model for the calculation of the current distribution, including the back‐flow current along with finite‐element calculations. F...