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Information × Registration Number 0223U003290, 0120U101118 , R & D reports Title The mathematical modeling of layered composites with subsurface defects and the development of an optical-acoustic method for their detection popup.stage_title Head Nazarchuk Zinoviy T., Доктор фізико-математичних наук Registration Date 12-04-2023 Organization Western Scientific Center of the National Academy of Sciences of Ukraine and the Ministry of Education and Science of Ukraine popup.description2  A technique for determining the non-stationary thermal and thermal stress states of radially inhomogeneous hollow cylindrical bodies in the absence of information about the thermal load on one of the boundary surfaces, resistant to small input data errors, is proposed. On the basis of the proposed mathematical model of the description of deformation processes in solid bodies under complex loading using the finite element method, software was developed to determine the stress-strain state of structural elements made of non-homogeneous thermosensitive materials. A model of an optical-digital system with a scheme of registration of digital holograms of focused images and speckle images was built, and on its basis an experimental setup was created for the reconstruction of the fields of surface movements and deformations of sheet composite materials and the study of crumpling processes near round holes. A series of holograms of focused images, Fresnel holograms, and speckle images of the surface area of a sheet layered composite with a round hole that was loaded by tension were obtained experimentally, and three-dimensional fields of surface displacements were reproduced after them. Product Description popup.authors popup.nrat_date 2023-04-12 Close