3D Finite Element Analysis of the Tube Plate Stress-Strain State

The choice of optimal tube plate thickness of high-pressure preheaters of chamber-type (HPCP) by modern computation methods is an actual engineer problem. In the paper the scheme, which allows defining the tube plate thickness of the HPCP by finite element (FE) modeling with application of the composite structure mechanics methods is presented. Tube plate thickness was chosen with the use of axisymmetric modeling in accordance with the R.F. atomic norms and regulations. The axisymmetric FE model of the HPCP with the spherical bottom and the U-tube bunch was researched and the stress-strain state for a plane plate was defined. FE research of the tube plate 3D stress-strain state was carried out on basis of the HPCP model accounting the design features in the shape of rigid inclusions and technological fillets. In the last part of the work, were defined the effective properties of the periodicity cell of the material by means of the homogenization method. There was carried out FE simulation of the HPCP with the substitution of a homogeneous material for the tube plate material and with the application of the step-by-step heterogenezation in the areas of the connections of solid and holed material as well as in the maximum stress area. Account of the new design features influence and application of the composite structure mechanics methods made it possible to determine more exactly the stress-strain state of the HPCP in the jointing places between the uniform and holed materials as well as in the maximum stress area.
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