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Information × Registration Number 0226U002091, (0124U005021) , R & D reports Title The development of the nonlinear three-dimensional creep theory of hereditary type and elaborating the heredity kernel methods identification. popup.stage_title Побудова системи визначальних рівнянь теорії повзучості спадкового типу за умов одновісного напруженого стану Head Golub Vladyslav P., д.т.н. Registration Date 06-02-2026 Organization S.P. Tymoshenka Institute of Mechanics of the National Academy of Sciences of Ukraine popup.description1 The derivation of the system of constitutive equations of the nonlinear three-dimensional creep theory of hereditary type, selection and justification of the structure of heredity kernels, the development of methods for determining the parameters of heredity kernels and solving the problems of calculation of creep deformations and stresses relaxation in structural elements made of viscoelastic materials, taking into account the influence of the type of stress state and history load. popup.description2 REPORT A system of constitutive equations for hereditary creep theory under uniaxial stress conditions is developed. Recommendations are proposed for determining the material constants of hereditary creep in structural materials and for predicting critical creep-induced deformations of structural elements. The nonlinearity of material behavior is described through the nonlinearity of instantaneous stress–strain diagrams, based on the hypothesis of a unified isochronous diagram. The structure of the heredity kernels is represented by fractional-exponential functions. Experimental validation of the constitutive equations and the procedures for identifying the parameters of the heredity kernels is carried out by solving creep and relaxation problems under stationary loading conditions. Product Description popup.authors Yaroslav V. Pavluyk Svyatoslav I. Motrunich Vladymir M. Pelykh Vira S. Ushakova Alla V. Plashchynska Oleksandr V. Romanov Yurii Y. Yarovynskyi Svitlana B. Danylchenko Serhii O. Solovei Olena A. Kaminska Dmytro P. Chernous Zoia V. Kovhanych Borys P. Maslov Pavlo D. Chernous popup.nrat_date 2026-02-06 Close