Concrete High-frequency Elastic Wave Scattering

Structural health monitoring of real-time online is the trend of the structure monitoring. In the new research (based on piezoelectric smart / sensor integration technology), through the piezoelectric chip adhesion or in the surface of the structure, the internal voltage pulse generated under the high-frequency elastic waves, can range in local area identified within the structure of early injury. And the work in this article is the analysis of high-frequency elastic waves in concrete structure of the wave field of information dissemination for the local damage within the scope of identification criteria.This article introduces the concrete structure and high-frequency characteristics of elastic waves, and the research background is introduced. Then, based on the basic theory of elastodynamics, the use of wave function expansion method, concrete structure on the high-frequency scattering of elastic waves are analyzed. Given the structure of solutions of elastic wave field analysis of the expression. According to the displacement and stress in the scatterer continuous interface conditions, to determine the unknown coefficients. After the numerical analysis of the incident wave at different frequency characteristics of the scattering wave field, wave propagation in order to determine the effective domain. Concrete structure in a mixture of different types, the high-frequency elastic wave scattering wave field characteristics vary, but they have similar basic features. Lower frequency in the incident cases, scatterer size no significant effect on the wave field, as the frequency increases, the impact became apparent, wave-field information is also complicated. In individual frequency bands, and in special frequency bands, even the sudden emergence of an effective field growing or standing wave characteristics appear.Finally, the results are analyzed and the size of a valid domain is discussed. And follow-up is presented.