Heating characteristics of metal fatigue crack in ultrasonic IR lock-in thermography

Feng Fuzhou; Min Qingxu; Zhu Junzhen; Xu Chao; Cao Wei

doi:10.3788/IRLA201746.0704004

Ultrasonic infrared lock-in thermography is a novel nondestructive testing technology, which mainly combines the modulated excitation and lock-in technology to achieve infrared thermography test. With the lack of study on the frictional heating simulation and interior heating mechanism during the defect heating and diffusion, the electric-force analogy method was utilized to build the finite element model of the ultrasonic transducer and the metal plate with the fatigue crack. Simulation results show that the crack heating periodically increases with the modulated ultrasonic excitation, and the heating area of crack faces is closed to the excitation side by the influence of the engagement force. Based on the simulation results and the Green function, a theoretic model was introduced to describe the heat diffusion of the crack frictional heating and the heat distribution of the crack vicinity was demonstrated. Further,the depth of the heat source was estimated with the ratio between top and lower surface of the test plate(P-value), which shows consistency between simulation and theoretic results. This study aims to enrich the theoretic basis in ultrasonic infrared lock-in thermography.

Heating characteristics of metal fatigue crack in ultrasonic IR lock-in thermography

1. Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China;

2. Department of Mechanical Engineering,Academy of Armored Forces Engineering,Beijing 100072,China;

3. Beijing Special Vehicle Research Institute,Beijing 100072,China

Received Date: 2016-11-05

Rev Recd Date: 2016-12-03

Publish Date: 2017-07-25

Key words:

Abstract: Ultrasonic infrared lock-in thermography is a novel nondestructive testing technology, which mainly combines the modulated excitation and lock-in technology to achieve infrared thermography test. With the lack of study on the frictional heating simulation and interior heating mechanism during the defect heating and diffusion, the electric-force analogy method was utilized to build the finite element model of the ultrasonic transducer and the metal plate with the fatigue crack. Simulation results show that the crack heating periodically increases with the modulated ultrasonic excitation, and the heating area of crack faces is closed to the excitation side by the influence of the engagement force. Based on the simulation results and the Green function, a theoretic model was introduced to describe the heat diffusion of the crack frictional heating and the heat distribution of the crack vicinity was demonstrated. Further,the depth of the heat source was estimated with the ratio between top and lower surface of the test plate(P-value), which shows consistency between simulation and theoretic results. This study aims to enrich the theoretic basis in ultrasonic infrared lock-in thermography.

HTML

Reference (11)

[1]	Rantala J, Wu D, Busse G. Amplitude-modulated lock-in vibrothermography for NDE of polymers and composites[J]. Research in Nondestructive Evaluation, 1996, 7(4):215-228.
[2]	Busse G, Wu D, Karpen W. Thermal wave imaging with phase sensitive modulated thermography[J]. Journal of Applied Physics, 1992, 71(8):3962-3965.
[3]	Wang Zijun, Liu Junyan, Dai Jingmin, et al. Heat transfer analysis and finite element simulation of phase infrared nondestructive testing[J]. Journal of Millimeter Waves, 2008, 27(5):361-364. (in Chinese)
[4]	Peng D, Jones R. Modelling of the lock-in thermography process through finite element method for estimating the rail squat defects[J]. Engineering Failure Analysis, 2013, 28(3):275-288.
[5]	Qin Lei, Liu Junyan, Gong Jinlong, et al. Testing surface crack defects of sheet metal with ultrasonic lock-in thermography[J]. Infrared and Laser Engineering, 2013, 42(5):1123-1130. (in Chinese)
[6]	Busse G, Gleiter A, Spiessberger C. NDE using lock-in thermography principle and recent developments[J]. Nondestructive Testing of Materials and Structures, 2013, 6(1):627-632.
[7]	Feng Fuzhou, Min Qingxu, Zhang Chaosheng, et al. The electric-mechanic analogous excitation method for the analog simulation of ultrasonic infrared imaging technique[J]. Nondestructive Testing, 2014, 36(7):1-5. (in Chinese)
[8]	Xu Weihua, Bao Hai, Yang Yihan, et al. Voltage signal transmission principle based on the inverse piezoelectric effect of piezoelectric ceramic[J]. Automation of Electric Power Systems, 2010, 34(4):80-83. (in Chinese)
[9]	Zhang Chaosheng, Feng Fuzhou, Min Qingxu, et al. Effect of engagement force on vibration characteristics and frictional heating in sonic IR imaging[J]. NDT E International, 2015, 76(1):52-60.
[10]	Feng Fuzhou, Zhang Chaosheng, Min Qingxu, et al. Heating characteristics of metal plate crack in sonic IR imaging[J]. Infrared and Laser Engineering, 2015, 44(5):1456-1461. (in Chinese)
[11]	Zhang Chaosheng. Research on detection of metal plate crack based on sonic infrared imaging[D]. Beijing:Academy of Armored Forces Engineering, 2015. (in Chinese)

Heating characteristics of metal fatigue crack in ultrasonic IR lock-in thermography

doi: 10.3788/IRLA201746.0704004

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Related

Proportional views