Technical Diagnostics and Non-Destructive Testing #3, 2019, pp. 8-12
Modeling a circumferential crack in pipe area of a flat bottom of thick-walled pressure vessel
V.V. Kirichok, V.M. Torop
E.O.Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevich str., 03150, Kyiv, Ukraine. E-mail: email@example.com
The pipe area of a flat bottom of thick-walled pressure vessel was considered. The field of residual welding stresses was calculated by finite element method, taking into account many welding passes. In order to study the process of fracture of a multipass weld in operation, the approximation method for transferring stress tensors, deformations and displacements of the residual state in the form of initial boundary conditions to a new finite element mesh with crack simulation is presented. Analysis of the change of structure safety with increase of the crack depth was performed in the work. 4 Ref., 1 Table, 5 Fig.
residual stresses, field mapping, thermal cycle of welding, crack, stress intensity factor
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