NDLI: Critical Assessment of the Integrity of Thin Organic Films by Shearography

Content Provider	Springer Nature Link
Author	Habib, K.
Copyright Year	2010
Abstract	The temperature versus thermal deformation (strain) with respect to time, of different coating films was studied by a non-destructive technique (NDT) known as shearography. The behavior of organic coatings, i.e., epoxy, a white enamel, or a yellow acrylic lacquer on carbon steels, was investigated at a temperature range simulating the severe weather temperatures in Kuwait especially 20–60 °C differences between the daylight and the night time temperatures. The investigation focused on determining the in-plane displacement of the coatings, which amounts to the thermal deformation that results from the applied temperature range. Furthermore, the investigation also focused on determining the thermal expansion coefficients of coatings and the slope of the plot of the thermal deformation versus the applied temperature range. A critical (steady state) value of the thermal expansion coefficients of coatings was used to determine the integrity of the coatings with respect to time. This value was determined from the decreasing, time-dependent value of the thermal expansion coefficients of coatings. In fact, determination of critical (steady state) value of the thermal expansion coefficients of coatings could be accomplished independent of parameters such as UV exposure, humidity, presence of chemical species, and other parameters normally considered in conventional methods of the assessing of the integrity of coatings. By using the technique of shearography, one needs only to determine the critical (steady state) value of the thermal expansion coefficients of coatings, regardless of the history of the coating, in order to assess the integrity of coatings. These results indicate that the technique is a very useful NDT method for determining the critical value of the thermal expansion coefficients of different coatings and can be used as a 2D-microscope for monitoring the deformation of the coatings in real-time at a submicroscopic scale.
Starting Page	427
Ending Page	433
Page Count	7
File Format	PDF
ISSN	15477029
Journal	Journal of Failure Analysis and Prevention
Volume Number	10
Issue Number	5
e-ISSN	18641245
Language	English
Publisher	Springer US
Publisher Date	2010-07-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Shearography Optical interferometry Thermal expansion coefficient In-plan displacement High temperatures Carbon steel Organic Coating Epoxy Quality Control, Reliability, Safety and Risk Structural Mechanics Mechanics Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Materials Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Safety, Risk, Reliability and Quality Mechanical Engineering

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