Sklepus S. Creep and creep-damage of bodies with complex shape from materials with characteristics dependent on the kind of loading

The object of the study are the processes of nonlinear deformation and damages accumulation in bodies from materials with characteristics dependt on the kind of loading (MCDKL). The aim of the work is to develop a method for studying the creep and creep-damage of bodies with complex shape from MCDKL. Research methods: the R-functions method, the variational methods, the Runge-Kutta-Merson method (RKM). The obtained constitutive equations and the method for solving of creep and creep-damage problems constitute the theoretical basis of engineering methods for calculating the creep and long-term strength of structural elements of complex shape. The obtained results can be used in organizations engaged in calculating the long-term strength and durability of structural elements made from modern materials. Scientific novelty: new constitutive equations of creep are constructed; a new method based on the joint application of methods of R-functions, Ritz and RKM for solving nonlinear initial-boundary problems of creep and creep-damage for bodies of complex shape is developed; number of new problems of creep and damageability of bodies from MCDKL have been solved. The results of the work are used in the Kharkiv National Automobile and Highway University to calculations of road clothes with elastic-viscous properties. Areas of application are mechanical engineering, power engineering and construction.