Abstract
Considering the influence of the fixing method of the component in the system on its results in ultrasonic infrared thermography testing, the detection experiments of the cracked plat structure with fixing at one end and fixing at two ends are carried out through different fixing methods of the equivalent structure. The results show that for the same structure to be detected, the more the bounds are fixed, the more the degrees of freedom are restricted, the less ultrasonic energy is dissipated during the inspection process, and the better the inspection effect. The work has positive significance for the selection of detection parameters in ultrasonic infrared thermography testing, helpful to provide some references for it.
Highlights
Safety accidents caused by micro-cracks, fatigue and fracture of key structures are not uncommon
The windshield burst of Sichuan Airlines Flight 8633 caused a moment of fright [1], the fatigue crack of the US F15C fighter jet's nose caused air disintegration [2], and the US KC the propeller of the 130T transport/tanker broke in the air, causing the plane to crash [3]
During the operation of equipment, some key structures need to withstand external loads such as pressure, temperature, corrosion, or alternating stress during service, which are prone to cracks, fatigue and other damages, which can lead to structural fractures in severe cases, bringing serious hidden dangers to equipment safety
Summary
Safety accidents caused by micro-cracks, fatigue and fracture of key structures are not uncommon. Ultrasonic infrared thermography testing technology is an emerging non-destructive testing technology in recent years [8]. It has the characteristic of selective heating of defects, especially suitable for damage detection of complex structures and micro-cracks [9][10]. To realize the real-time inspection of key structures, it is necessary to analyse the influence of the component fixing method on the crack heat generation. This is helpful to select the detection parameters under the external conditions to achieve good detection results
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