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Information × Registration Number 0219U003656, 0117U004969 , R & D reports Title A development of methods for mathematical modeling of new and composite materials behavior for the lifetime estimation and reliability prediction of engineering elements popup.stage_title Head Larin Oleksiy, Registration Date 07-02-2019 Organization National Technical University 'Kharkiv Polytechnic Institute" popup.description2 The object of the research is deforming processes of elements of constructions from new and composite materials, as well as processes of development of non-localized damage and localized volume surface defects, which are formed in elements of structures during operation due to fatigue, creep and corrosion. The objectives of the work is to develop calculation methods for predicting reliability and analysis of the structural strength of new and composite materials, as well as determination of the laws of the influence of degradation processes caused by fatigue, creep, corrosion and aging of such materials on the resource of elements of machine-building constructions in the conditions of operation under the proposed approaches. The subject of the work is the parameters of the stress-strain state of machine-building constructions, which is formed in operation under conditions of the action of elevated temperatures and mechanical loading, in particular for elements with operation defects, life-time and reliability according to the criteria of long-term durability. Models and algorithms of statistical numerical simulations for the estimation of residual static and cyclic strength of structural elements with corrosion damage are considered. It takesinto account the random task of the geometry of this damage and pridction of its stochastic development in operation. A calculated approach to the estimation of the accumulation of fatigue damage in corrosion-damaged structural elements in operation has been proposed, which provided an opportunity to predict their reliability. An experimental study of orthotropic viscoelastic properties of glass fiber has been carried out, and tabular and approximated dependences of the relaxation curves of relaxation tensor components and technical viscoelastic parameters have been found. The theoretical and experimental features of the anisotropy of viscoelastic properties of two-directional polymer composite materials are investigated. In addition, it was established that the character and parameters of the temperature shift function of the reinforced composites quantitatively and qualitatively coincide with the nature and parameters of the shift function of the polymer matrix. A series of experimental tests have been carried out on the formation of visco-elastic characteristics of rubber composites in conditions of different static temperature states and in cyclic self-warming on different amplitudes of deformations and loading frequencies. The technical reception of imposed netting for the simulation of anise is proposed. The filamentous visco-elastic properties of materials in the software complexes of finite-element analysis, which provides a significant expansion of the possibilities of using existing software tools for the modeling of mechanical behavior of anisotropic viscoelastic composites.An algorithm for theoretical modeling of nonlinear cyclic deformation of rubber composites based on an artificial neural network and a computer system for the intelligent analysis of the mechanical properties of heterogeneous materials. There is a scientific novelty, and the developed algorithms and software tools are used in practical engineering studies of structural elements. Product Description popup.authors Бескровний Я.Ю Водка О.О. Вязовиченко Ю.А. Ларін О.О. Львов І.Г. Мартиненко В.Г. Осетров А.О. Потопальська К.Є. Суханова О.І. Шаповалова М.І. popup.nrat_date 2020-04-02 Close