研究目的
To present a method for nondestructive evaluation (NDE) of advanced materials that makes use of the images in near field and the concentration of flux using the phenomenon of spatial resolution.
研究成果
The method presents the advantage of giving in one representation both the information about amplitude and phase obtained from the sensor. The images are in good concordance with the images obtained by optical microscopy.
研究不足
Further tests on a larger number of specimens with different coating aspects of the surface / number of layers are needed to establish the accuracy of the results and also the correlation between the localized small-sized discontinuities and the resulting MM sensor indication.
1：Experimental Design and Method Selection:
The method uses electromagnetic nondestructive evaluation (eNDE) based on the modification produced by the variation of electrical properties of the examined material due to small inclusions, mechanical /thermal fatigue or of structural components.
2：Sample Selection and Data Sources:
Steel plates AISI 4340 and AISI 316L coated with ZrO2 and ZrO2 and 20 % Y2O3 were studied.
3：List of Experimental Equipment and Materials:
An electromagnetic sensor with MM lens, absolute send-receiver-type, was used. The lens is made using two conical Swiss rolls (CSR).
4：Experimental Procedures and Operational Workflow:
The sensor is maintained in fix position, the relative displacement sensor – object to be controlled is made with a XY motorized stage Newmark.
5：Data Analysis Methods:
The scanning, measurements, acquisition and the processing of data were commanded by a PC using programs developed in Matlab 2014b.
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