Yakovenko N. Dynamic problem for cylindrical solids of inelastic materials with the microstructural transformations under pulse thermomechanical loading.

Thesis is devoted to development of approach to simulation of the coupled thermostructural-mechanical processes in cylindrical solids made of inelastic materials and subjected to the pulse thermomechanical loading. Volume strain caused by the microstructural transformations of the martensitic type under cooling as well as into consideration and dependence inelastic characteristics of material for multiphase state are taken. A flow model is used to describe of innelastic material behaviour. Tempera-ture dependence of the parameters of model for each phase by experimental data is determined. Parameters of model for arbitrary of phase state by the mixture rule to determined. Time step integration and dual iterative methods as well as finite element method are used for numerical solving of the problem of thermomechanics. Equations of the evolution for the inelastic flow model are integrated by the Euler method. The Newmark time integration method is used to deal with the motion equations. The im-plicit schemes of the integration were adopted. Main regularities of the transient and residual stress-strain state as well as mi-croctructural state of the elongated cylinder, disk and half-space subjected to thermal and mechanical pulse are investigated. Effects caused by the microstructural trans-formation upon cooling and thermostructural-mechanical coupling are investigated.