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Information × Registration Number 0222U000029, 0117U000521 , R & D reports Title Development of the methods for diagnostic layered composites based on the solving boundary and spectral problems of diffraction of elastic waves popup.stage_title Head Kuryliak Dozyslav B, Registration Date 02-01-2022 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description2  The Wiener-Hopf method is applied to solve the scalar and vector mixed boundary-value problems of the theory of diffraction of elastic waves from the internal and interfacial thin defects such as cracks, delamination, and inclusions in the plane layers and their joints. The structures under consideration are modeled by flat elastic waveguides and studied under the conditions of their harmonic excitation. The defects are specified by the surfaces on which the different types of boundary conditions are satisfied. The ideal boundary conditions are considered for describing formed defects such as rigid inclusions and cracks, and impedance-type boundary conditions are used for assessing the degree of damage to plane-layered structures. Based on the solution of the diffraction problems, the physical features of the scattered fields are analyzed. The effects of the transformation of modes at the tops of the defects for various types of damages are studied for different geometrical parameters of the scattering structure and the probing frequency. The identification signs of defects are determined using the peculiarities of the distribution of the displacement field on the surfaces free from the load. The obtained solutions of diffraction problems are used to solve spectral problems and determine the identification parameters under conditions of resonant excitation Product Description popup.authors Ivansʹka Nadiya I. Ivasenko Iryna Bohdanivna Voytko Myron V. Dzhala Vasylʹ R. Kotsyuba Yuriy M. Kulynych Yaroslav P. Kuryliak Dozyslav Bogdanivych Lysechko Viktor O. Maksymenko Oleksandr P. Nazarchuk Zinovij Teodorovich Stasyshyn Ihor Viktorovych Trishchuk Oksana B. Sharabura Oleksiy M. popup.nrat_date 2022-03-09 Close