A Study on Corrosion Defect Evaluation of Painted Metal by Using Nondestructive Tests

2008 ◽  
Vol 47-50 ◽  
pp. 1071-1075
Author(s):  
Kyung Seok Song ◽  
Myung Seok Ko ◽  
Jae Yeol Kim
Keyword(s):  
Detection System ◽  
Surface Condition ◽  
Economic Loss ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ir Camera ◽  
Nondestructive Tests ◽  
Coated Metal ◽  
Related Defect ◽  
Non Destructive

Importance on the detection of corrosion-related defect is undeniable from the fact that it can prevent significant economic loss and enhanced safety in mechanical equipments, pipes, ships, bridges, and other applications. Conventionally researched measurement methods for defect and thinning from corrosion are acoustic emission, EMAT using ultrasound, laser induced ultrasound, etc. However, these non-destructive testing methods have the shortcoming of accessibility to on-site. For instance, EMAT should be close to several millimeters to generate magnetic field in structure. For laser application, it can be applied to remote non-destructive testing, but some defect might not be possible to be detected by the surface condition of structure. In this study, infrared thermography camera is utilized to determine the degree of corrosion on paint-coated metal. In addition, fundamental researches to develop corrosion detection system for on-site metallic structure are conducted to provide the applicability of IR camera and possibility of thermal analysis method.

scholarly journals Inductive Thermography as Non-Destructive Testing for Railway Rails

2021 ◽  
Vol 11 (3) ◽  
pp. 1003
Author(s):  
Christoph Tuschl ◽  
Beate Oswald-Tranta ◽  
Sven Eck
Keyword(s):  
Eddy Current ◽  
Electrical Discharge Machining ◽  
Rolling Contact ◽  
Heat Diffusion ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ir Camera ◽  
Advantages And Disadvantages ◽  
Average Crack ◽  
Non Destructive

Inductive thermography is a non-destructive testing method, whereby the specimen is slightly heated with a short heating pulse (0.1–1 s) and the temperature change on the surface is recorded with an infrared (IR) camera. Eddy current is induced by means of high frequency (HF) magnetic field in the surface ‘skin’ of the specimen. Since surface cracks disturb the eddy current distribution and the heat diffusion, they become visible in the IR images. Head checks and squats are specific types of damage in railway rails related to rolling contact fatigue (RCF). Inductive thermography can be excellently used to detect head checks and squats on rails, and the method is also applicable for characterizing individual cracks as well as crack networks. Several rail pieces with head checks, with artificial electrical discharge-machining (EDM)-cuts and with a squat defect were inspected using inductive thermography. Aiming towards rail inspection of the track, 1 m long rail pieces were inspected in two different ways: first via a ‘stop-and-go’ technique, through which their subsequent images are merged together into a panorama image, and secondly via scanning during a continuous movement of the rail. The advantages and disadvantages of both methods are compared and analyzed. Special image processing tools were developed to automatically fully characterize the rail defects (average crack angle, distance between cracks and average crack length) in the recorded IR images. Additionally, finite element simulations were used to investigate the effect of the measurement setup and of the crack parameters, in order to optimize the experiments.

scholarly journals Comparison of Cooled and Uncooled IR Sensors by Means of Signal-to-Noise Ratio for NDT Diagnostics of Aerospace Grade Composites

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3381 ◽  
Author(s):  
Shakeb Deane ◽  
Nicolas P. Avdelidis ◽  
Clemente Ibarra-Castanedo ◽  
Hai Zhang ◽  
Hamed Yazdani Nezhad ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Non Destructive Testing ◽  
Signal To Noise ◽  
Destructive Testing ◽  
Ir Camera ◽  
Thermal Cameras ◽  
Aerial Vehicle ◽  
Noise Ratio ◽  
Processing Techniques ◽  
Non Destructive

This work aims to address the effectiveness and challenges of non-destructive testing (NDT) by active infrared thermography (IRT) for the inspection of aerospace-grade composite samples and seeks to compare uncooled and cooled thermal cameras using the signal-to-noise ratio (SNR) as a performance parameter. It focuses on locating impact damages and optimising the results using several signal processing techniques. The work successfully compares both types of cameras using seven different SNR definitions, to understand if a lower-resolution uncooled IR camera can achieve an acceptable NDT standard. Due to most uncooled cameras being small, lightweight, and cheap, they are more accessible to use on an unmanned aerial vehicle (UAV). The concept of using a UAV for NDT on a composite wing is explored, and the UAV is also tracked using a localisation system to observe the exact movement in millimetres and how it affects the thermal data. It was observed that an NDT UAV can access difficult areas and, therefore, can be suggested for significant reduction of time and cost.

Ultra-Compact Eddy Current Transducer for Corrosion Defect Search in Steel Pipes

2022 ◽  
Vol 1049 ◽  
pp. 282-288
Author(s):  
S.F. Dmitriev ◽  
Vladimir Malikov ◽  
Alexey Ishkov ◽  
Sergey Voinash ◽  
Marat Kalimullin ◽  
...  
Keyword(s):  
Defect Detection ◽  
Eddy Current ◽  
Detection System ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Steel Pipes ◽  
Operational Characteristics ◽  
Margin Of Safety ◽  
Design And Manufacture ◽  
Non Destructive

This research is devoted to the application of non-destructive testing methods for detecting defects of the internal structure of the material in steel pipelines. Despite the use of modern approaches to the design and manufacture of pipelines, which make it possible to lay a significant margin of safety in the created system, the task of developing new approaches to measuring the technical and operational characteristics and parameters of steel parts using software and hardware complexes for non-destructive testing does not lose its relevance. The paper presents the results of the development of defect detection system aimed at detecting damage of the structure of the material with a diameter of 0.2 mm and located at a depth of up to 2 mm. The proposed system is based on the physical principles of the influence of the existing defect on the value of the transformer voltage, which is induced in the measurement circuit of the sensor built on eddy current effects. The focus of the research is the relationship between the linear dimensions of the defect, its location and the generated voltage indications of the developed sensor. Also, within the framework of the study, the results of processing and analysis of the data collected by the defect detection system are presented, the result of which was the determination of the parameters of the detected defects.

scholarly journals An Examination on Queuing Classification in Non-Destructive Testing

2019 ◽  
Vol 9 (1S4) ◽  
pp. 669-674
Keyword(s):  
General Population ◽  
Cleaning Process ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Nondestructive Tests ◽  
Test Strategy ◽  
Quality Dimension ◽  
Maintenance Work ◽  
Generation Costs ◽  
Non Destructive

Nondestructive testing (NDT) is the way toward assessing, testing, or assessing materials, segments or gatherings for discontinuities, or contrasts in attributes without pulverizing the usefulness of the part or framework. Today current nondestructive tests are utilized in assembling, creation and in-administration investigations to guarantee item uprightness and unwavering quality, to control fabricating forms, lower generation costs and to keep up a uniform quality dimension. Amid development, NDT is utilized to guarantee the nature of materials and joining forms amid the manufacture and erection stages, and in-administration. NDT assessments are utilized to guarantee that the items being used keep on having the honesty important to guarantee their value and the security of the general population .Test strategy names regularly allude to the kind of entering medium or the hardware used to play out that test. One of the every now and again utilized test techniques is Liquid infiltrating test. The procedure is carried out in such a way that, to begin with, the penetrant is connected on the specimen which is to be tried, next the utilization of developer is done. In any case, before this designer procedure, there is a delay where other distractive procedure to be discounted. Next after the developer procedure, the procedure is rehashed if the aftereffect of the item isn't true to form. Following, maintenance work, for example, pre cleaning process like showering, brushing, inundating and so on is done. At last if in need another primer nondestructive test is additionally done for the item got. The above procedure is totally changed into a Queuing procedure in which the issue is all around concentrated by hypothesis of lining and it is illuminated by beneficial variable strategy. By the utilization of the above strategy, all the presentation proportions of the line in this procedure can be determined. Numerical delineation and graphical portrayal still amplify the model to a great extent.

Non destructive testing of works of art by terahertz analysis

2013 ◽  
Vol 64 (2) ◽  
pp. 21001 ◽  
Author(s):  
Jean-Luc Bodnar ◽  
Jean-Jacques Metayer ◽  
Kamel Mouhoubi ◽  
Vincent Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Non Destructive

Modeling of a sensitive element on a planar mushroom-shaped metamaterial for non-destructive testing and searching for inhomogeneities in technological media

2020 ◽  
pp. 54-59
Author(s):  
A. A. Yelizarov ◽  
A. A. Skuridin ◽  
E. A. Zakirova
Keyword(s):  
Sensitive Element ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Resonant Frequency Shift ◽  
Maltese Cross ◽  
Informative Parameters ◽  
Non Destructive ◽  
Cross Type ◽  
Electrodynamic Structure ◽  
Electrophysical Parameters

A computer model and the results of a numerical experiment for a sensitive element on a planar mushroom-shaped metamaterial with cells of the “Maltese cross” type are presented. The proposed electrodynamic structure is shown to be applicable for nondestructive testing of geometric and electrophysical parameters of technological media, as well as searching for inhomogeneities in them. Resonant frequency shift and change of the attenuation coefficient value of the structure serve as informative parameters.

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