Evaluation of Thermal Damage in Pipe by Nonlinear Guided Wave

Abstract

This work investigates the evaluation of thermal damage in aluminum pipe by using nonlinear guided wave. Thermal loading was imposed on the specimens to cause thermal degradation. Flexible Polyvinylidene Fluoride (PVDF) comb transducers are used to generate and receive the ultrasonic waves. The second harmonic wave generation technique was used to check the material nonlinearity change after different heat loading. Conventional linear ultrasonic approach based on the acoustic attenuation was also used to evaluate the thermal damages in specimens. These results show that the proposed experimental setup can be used to assess the thermal damages in tube-like structures. Ultrasonic nonlinear parameter is a more promising potential candidate for the prediction of micro-damages in a tube-like structure than linear ones.