Effects of structural parameters on crack heating based on finite elements modeling

The sonic infrared imaging technology is a new nondestructive detection technology combining ultrasonic excitation and infrared imaging which can detect the defects of structure. In this paper, a ferruginous plate is considered as the research object to open out mechanism of crack heating in this technology. A finite element model based on the transducer and plate is established, heating characteristics in the crack are studied here under different excitation time and different structural parameters, such as crack shape and location. Research results show that temperature in the crack area increase with the excitation time, but increasing rate becomes more and more small. And the influence of crack shape on crack heating presenting a monotonous function situation, while heating of cracks at different location demonstrates a phenomenon of rise and fall. The research of structural parameters on crack heating will establish the theory basis for mechanism research on crack heating in the sonic infrared imaging technology.