FREQUENCY IMPEDANCE PHYSICAL AND MATHEMATICAL MODELS AKUSTOELEKTROMAGNITNOGO METHOD OF NONDESTRUCTIVE TESTING COMPOSITE MATERIALS
On the basis of the theory of propagation of elastic waves in layered materials sold impedance mathematical modeling akustoelektromagnitnym NDT method of composite materials. Using this model, the model obtained resonance frequencies of the composite material. The structure of the composite material laid defects. The first type of defects in the form of a lack of adhesive – neprokley disclosed. The second type of defect no adhesive - pressed neprokley. The resulting mathematical model to find the resonant frequency of composite materials having no defects, as well as having defects such as lack of adhesive and clamped in the open state. As an example, the three-layer model that calculated resonant frequencies are in good agreement with the results of the acoustic resonance method. Of work that the resonant frequency shift of defective samples. So for samples with defect type disclosed neprokley resonance frequencies are shifted to lower frequencies. For samples with defects such as pressed neprokley resonance frequencies are shifted to higher frequencies. We have thus shown that the activated adhesive is a sensor defect in activated adhesive joint and neighboring.