Micjuk S. The influence of initial defects on the life-time of bodies of revolution under high-cycle loading

Thesis for degree of candidate of technical sciences, specialty 05.23.17 - structural mechanics. - Kyiv national university of construction and architecture of Ministry of education and science, young people and sport of Ukraine, Kуiv, 2011. Solving correlation of semianalytical finite element method (SFEM) for circular finite elements (FE) with a variable after characteristic direction geometry and for special FE with a variable physical-mechanical characteristics for descriptions for the design of features of stress-strain state at presence of zones of destruction are obtained. The algorithm of calculation of continual damage mechanics parameters is worked out in the conditions of the high-cycle loading on the basis of SFEM, and methodology of continual destruction zones in the bodies of rotation. The efficiency of procedure of stress intensity factor (SIF) calculation by a direct method for the bodies of rotation is investigated. The effective algorithm of design of cracks development is worked out in the bodies of rotation at the action of the high-cycle loading that takes into account evolutional character of destruction at the decision of the systems of equalizations of FEM. It allows more than on an order to decrease calculable charges. The software for automated solving of nonlinear fracture mechanical problems is created. The analysis of authenticity of the got results is executed by comparing to the known upshots of test problems, comparing to experimental data, and also researches of convergence depending on the number of unknowns of finite-element model, and at the design of evolutional processes of destruction - additionally from the size of steps after loading. Practical problems about life-time determination of responsible spatial objects of tehnological equipmetnt under continual and discrete fracture untied.