Pashchenko S. Solution of three-dimensional problems of thermal and radiation creep in structural elements

Solutions of three-dimensional creep problems, characterizing by complex action of thermal, mechanical and radiation fields and having constant and periodically varying parts, as well as of non-stationary heat problems, are given. The method of solution, basing on Finite Element Method for boundary problems and Finite Differences method for initial ones, is refined. The possibility of consideration both physical non-linearities of different type as well as periodical loading, is realized. The method was realized in the form of developed software with support of distributed calculations. New regularities of the work of fiber-optic gyroscopes and platform of navigation device were determined with the help of experimental and numerical modeling. The processes of deformation and damage accumulation in fiber-optic cable for the case of the action of space radiation and temperature periodic varying during satellite’s orbital motion are investigated. New regularities of creep deformation of structural elements, such as suppressors and console elements of solar batteries of spacecrafts, T-joints of nuclear reactor’s cooling system are obtained.