BEHAVIOR OF A CYLINDRICAL SHELL WITH PARTIALLY DESTROYED HEAT-RESISTING COATING IN THE FIELD OF TEMPERATURES WITH SUBSEQUENT LOCAL COOLDOWN
N. I. Obodan, N. B. Makarenko, N. A. Guk, E. M. Kiselev
VANT. Ser.: Mat. Mod. Fiz. Proc 2004. Вып.3. С. 66-71.
The paper considers the behavior of a cylindrical shell with the damaged heat-resisting coating in the field of temperatures that leads to heating the damaged area. After the heated area has been forcedly cooled down, residual stresses occur in it. The mathematical model is represented by equilibrium equations, elasticity correlations and boundary conditions on the shell edges. The method of additional deformations is used to determine plastic deformations. Cherepanov-Raise criterion was chosen for the destruction model. The fracture growth conditions are the result of varying the total energy of the distorted shell with regard to energy consumed for generation of the new surface of defect. The stress-strained state is determined using the method of finite elements by COSMOS complex of application codes. Computation results are given, the dependence of critical heating temperature on the size of the heated area of damages is determined.
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