Phase ultrasonic testing of joints in multilayered composite materials

One of the new promising methods of nondestructive testing (NDT) is the ultrasonic harmonic wave method. The method uses wave phase characteristics that can be measured with high accuracy. It has proved to be very sensitive to structural changes in materials with regular structures. The application of the harmonic waves method for testing of composite materials with irregular structures as well as for joints of materials with distinctive properties may allow characterization of a wider class of materials such as ceramics, concrete, and metal-ceramic-plastic composites. Stochastic approaches are used to analyze distribution of mechanical properties for characterization of materials. Results of mathematical simulation of ultrasonic testing of joints in multilayered composites are shown. The method sensitivity is analyzed and some practical applications are presented in this paper.