Examination of the Optimal Frequency of the Cyclic Load in the Inverse Analyses of the Heat Conduction of Infrared Thermography

2007 ◽  
pp. 507-508 ◽  
Author(s):  
Kenji Machida ◽  
Shohei Miyagawa ◽  
Koich Hayafune
Keyword(s):  
Heat Conduction ◽  
Infrared Thermography ◽  
Cyclic Load ◽  
Optimal Frequency

Effect of the Frequency of the Cyclic Load to the Inverse Analyses of the Heat Conduction in Infrared Thermography

2006 ◽  
Vol 326-328 ◽  
pp. 1137-1140 ◽  
Author(s):  
Kenji Machida ◽  
Shohei Miyagawa
Keyword(s):  
Heat Conduction ◽  
Infrared Thermography ◽  
Hybrid Method ◽  
Inverse Analysis ◽  
Measurement Method ◽  
Cyclic Load ◽  
Stress Measurement ◽  
Hybrid Analysis ◽  
Element Analysis ◽  
Stress Components

Influence of the frequency to the temperature image obtained by an infrared thermography was investigated using specimens of three kinds of materials at four kinds of frequencies of the cyclic load. Then, the infrared hybrid method was developed to separate individual stress components. However, the influence of heat conduction is inevitable in the infrared stress measurement method. Therefore, an error arises in the infrared hybrid analysis. Then, the system which corrects the error by the inverse analysis was developed. Thereby, the accuracy of the stress intensity factor was able to be raised. Furthermore, the accuracy of hybrid method considering to heat conduction was discussed in comparison with the 3-D finite element analysis and 2-D hybrid method.

Identification and Reconstruction of Cracks in Ultrasonic Infrared Thermography

2012 ◽  
Vol 249-250 ◽  
pp. 46-50 ◽  
Author(s):  
Fu Zhou Feng ◽  
Chao Sheng Zhang ◽  
Qing Xu Min ◽  
Peng Cheng Jiang
Keyword(s):  
Image Processing ◽  
Heat Conduction ◽  
Infrared Thermography ◽  
Infrared Imaging ◽  
Ultrasonic Pulse ◽  
Detection Technique ◽  
One Dimension ◽  
Pulse Excitation ◽  
Conduction Model ◽  
Ultrasonic Infrared Thermography

Ultrasonic infrared thermography is a novel nondestructive detection technique, which combines a short ultrasonic pulse excitation and infrared imaging to detect defects, such as crack, in materials and structures. A simplified one-dimension heat-conduction model excited by ultrasonic pulses is put forward in this paper. Based on this model, a serial of image processing methods for recognition and reconstruction of cracks were presented. Results obtained show that the proposed method is creditable and applicable.

Influence of the Thickness and Frequency in the Infrared Hybrid Method in Consideration of Heat Conduction

2007 ◽  
Vol 353-358 ◽  
pp. 3092-3095
Author(s):  
Kenji Machida ◽  
Shohei Miyagawa
Keyword(s):  
Stress Intensity Factor ◽  
Heat Conduction ◽  
Hybrid Method ◽  
Inverse Analysis ◽  
Cyclic Load ◽  
Measuring Method ◽  
Hybrid Analysis ◽  
Element Analysis ◽  
Stress Components ◽  
Stress Measuring

Recently, the influence of heat conduction has been considered to be a big problem. Then, the influence of heat conduction was investigated by the experiment which changed the material, thickness of the specimen and frequency of a cyclic load. Then, the infrared hybrid method was developed to separate individual stress components. However, it has the influence by heat conduction in the infrared stress measuring method. Therefore, an error will arise in the infrared hybrid analysis. Then, the system which corrects the error by the inverse analysis was developed. Thereby, the accuracy of the stress intensity factor was able to be raised. Furthermore, the accuracy of hybrid method considering to heat conduction was discussed in comparison with the 3-D finite-element analysis and 2-D hybrid method.

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