Vasilyeva L. Coupled thermomechanical processes and structural transformations in the inelastic cylindrical solids under axysimmetric pulse thermal loading

Theses is devoted to development of approach to simulation of the coupled thermomechanical processes in cylindrical solids made of inelastic materials and subjected to the pulse thermal loading. Spherical strain caused by the microstructural transformations of the martensitic type under cooling are taken into consideration. A modified nonisothermal flow model is used to describe of nonelastic material behaviour under high rate temperature change. Temperature dependence of mechanical and physical characteristics as well as thermomechanical coupling are taken into account. Time step integration and dual iterative methods as well as finite element method are used for numerical solving of the problem of thermomechanics. Equation of the evolution for the inelastic flow model is integrated by the Euler method. The Newmark time integration method is used to deal with the motion and heat conduction equations. The implicit schemes of the methods were adopted. Main regularities of the transient and residual stress-strain state as well as microctructural state of the cylinder, disk and half-space subjected to simultaneous thermal and stress pulse are studied. Effects caused by the microstructural transformation upon cooling are investigated.