Перегляд за Автор "Morachkovsky, O. K."
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Документ Asymptotic methods and finite element method in cyclic creep-damage problems(Львівський національний університет ім. І. Франка, 2015) Breslavsky, D. V.; Mietielov, V. O.; Morachkovsky, O. K.; Pashchenko, S. O.; Tatarinova, О. А.Документ Creep damage anisotropy of thinwalled elements structures(IPPT PAN, Poland, 2004) Morachkovsky, O. K.; Burlayenko, V. N.The paper is devoted to the development and theoretical justification of an anisotropy creep damage material model. For the description of initial anisotropy and damage-induced anisotropy the second-order damage tensor has been used. The numerical method of anisotropy creep damage lifetime prediction in thin-walled elements of structures was elaborated on the basis of the proposed model and FE scheme. The results of anisotropy creep damage analysis in models of plates were discussed.Документ Nonlinear vibrations and long-term strength of turbine blades(National Technical University "Kharkov Polytechnic Institute", 2010) Breslavsky, D. V.; Morachkovsky, O. K.; Shyriaieva, N. V.The method of a durability estimation of rotating turbomachinery blades at forced flexural-flexural-torsional vibrations is offered. The method is based on the methods of Continuous Damage Mechanics and the accurate strain analysis of the pre-twisted blades at the nonlinear vibrations with moderate displacements. The method to solve the strain analysis problem and turbomachinery blades high-cycle fatigue damage estimation as a result of nonlinear vibrations is presented.Документ On the accuracy of creep-damage predictions in thinwalled structures using the finite element method(Springer-Verlag, 2000) Altenbach, H.; Kolarow, G.; Morachkovsky, O. K.; Naumenko, K.The constitutive model with a single damage parameter describing creep-damage behaviour of metals with respect to the different sensitivity of the damage process due to tension and compression is incorporated into the ANSYS finite element code by modifying the user defined creep material subroutine. The procedure is verified by comparison with solutions for beams and rectangular plates in bending based on the Ritz method. Various numerical tests show the sensitivity of long-term predictions to the mesh sizes and element types available for the creep analysis of thinwalled structures.Документ Problem statement of dynamic creep for isotropic and оrthotropic bodies(National Technical University "Kharkov Polytechnic Institute", 2010) Morachkovsky, O. K.; Sobol, V. N.Mathematical problem statement of dynamic creep for isotropic and orthotropic bodies is presented in the paper. The cyclic creep-damage theory of Breslavsky-Morachkovsky is used. Numerical methods for the solution of such creep problems is considered, where the mixed variational functional and RFM (Rvachov’s Functions method), or finite element method (FEM), are applied. Numerical results of the creep problem analysis for plate with centered hole under tension are given.