Abstract
Vibrothermography often employs a high-power actuator to generate heat on a specimen to reveal damage, however, the high-power actuator brings inconvenience to the application and possibly introduces additional damage to the inspected objects. This study uses a low-power piezoceramic transducer as the actuator of vibrothermography and explores its ability to detect multiple surface cracks in a metal part. Experiments were conducted on a thin aluminum beam with three cracks in different orientations. Detailed analyses of both thermograms and temperature data are presented to validate the proposed vibrothermography method. To further investigate the performance of the proposed vibrothermography method, we experimentally studied the effects of several critical factors, including the amplitude of excitation signal, specimen constraints, relative position between the transducer and cracks (the transducer is mounted on the same or the opposite side with the cracks). The results demonstrate that all cracks can be detected conveniently and simultaneously by using the proposed low-power vibrothermography. We also found that the magnitude of excitation signal and the specimen constraints have a great influence on detection results. Combined with effective data processing methods, such as Fourier transformation employed in this study, the proposed method provides a promising potential to detect multiple cracks on a metal surface in a safe and effective manner.
Highlights
Active infrared thermography (IRT) has received increasing attention in recent years due to its advantages of non-contact detection, high efficiency, and clear visualization
Based on different heating excitations, IRT techniques can be classified as pulsed phase thermography [6], step heating thermography [7], lock-in thermography [8], microwave thermography [9], laser thermography [10], inductive thermography [11], and vibrothermography
Vibrothermography, known as ultrasonic thermography or thermosonics, is a nondestructive testing (NDT) technique to detect the defects in materials using the combination of mechanical vibration and infrared imaging
Summary
Active infrared thermography (IRT) has received increasing attention in recent years due to its advantages of non-contact detection, high efficiency, and clear visualization. Based on different heating excitations, IRT techniques can be classified as pulsed phase thermography [6], step heating thermography [7], lock-in thermography [8], microwave thermography [9], laser thermography [10], inductive thermography [11], and vibrothermography. Among these techniques, vibrothermography, known as ultrasonic thermography or thermosonics, is a nondestructive testing (NDT) technique to detect the defects in materials using the combination of mechanical vibration and infrared imaging.
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