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http://dx.doi.org/10.7779/JKSNT.2015.35.6.398

Detection and Quantification of Defects in Composite Material by Using Thermal Wave Method  

Ranjit, Shrestha (Department of Mechanical Engineering, Kongju National University)
Kim, Wontae (Division of Mechanical & Automotive Engineering, Kongju National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.35, no.6, 2015 , pp. 398-406 More about this Journal
Abstract
This paper explored the results of experimental investigation on carbon fiber reinforced polymer (CFRP) composite sample with thermal wave technique. The thermal wave technique combines the advantages of both conventional thermal wave measurement and thermography using a commercial Infrared camera. The sample comprises the artificial inclusions of foreign material to simulate defects of different shape and size at different depths. Lock-in thermography is employed for the detection of defects. The temperature field of the front surface of sample was observed and analysed at several excitation frequencies ranging from 0.562 Hz down to 0.032 Hz. Four-point methodology was applied to extract the amplitude and phase of thermal wave's harmonic component. The phase images are analyzed to find qualitative and quantitative information about the defects.
Keywords
Infrared Thermography; Lock-in Thermography; Image Processing; Amplitude Image; Phase Image;
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Times Cited By KSCI : 3  (Citation Analysis)
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