In this paper, experiment work and a three-dimensional thermo-mechanical coupled finite element model are purposed to study relationships of dependency energy consumption on transducer tip size as well as crack length in the crack area. Different crack length is experimented and simulated in this study. Their acoustic energy and thermal energy are obtained and analyzed to demonstrate a general relationship of dependency energy consumption on transducer tip size as well as crack length presented in this paper.

Sonic infrared imaging is received progressive attention as a novel hybrid, thermal-based nondestructive testing technique. \[1-4\]. The high power-intensive ultrasonic pulse is utilized to induce nonlinearity vibration between defect contact surfaces. Such mechanical vibration will cause frictional heating, thus, defects will be revealed due to irreversible temperature change and captured by the on-site infrared camera.

The nonlinearity phenomena which also referred to as ‘acoustic chaos’ is observed and verified it can improve the detectability in sonic infrared imaging technique. The pure driving frequency can result in a complex spectrum: besides pure driving frequency, multiples of fractions of the driving frequency also appear. The nonlinearity is associated with a strong heat signature in the defect area, but the relationships of dependency energy consumption on transducer tip size as well as crack length in the crack area haven’t been studied. The corresponding research and data will be discussed, analyzed and presented in Sonic Infrared Imaging.

The different transducer tip provides different output energy; when the output energy from the transducer tip is changed, the consumed energy in the crack area is changed. When the output energy is adjusted and constrained to the same, the consumed energy of three different transducer tip condition has a similar level at the same crack length. By looking into these scenarios, the energy consumption trend is similar. Such patterns mean the energy is more determined by the crack length rather than the transducer tip size; therefore, the transducer tip size can be considered as a non-important variable in the energy function. The above-discussed energy data shows the energy is proportional to the square of crack length to the power of b


Studying Relationships of Dependency Energy Consumption on Transducer Tip Size and Crack Length in Sonic Infrared Imaging

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