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THE ANALYSIS OF THE STRESS-STATE
IN CONSTRUCTIONS IN EXPLOATATION
Taško Maneski
University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia
Vesna Milošević-Mitić
University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia
1. INTRODUCTION
The analysis of the constructions behaviour exposed to thermo-mechanical loading is
presented. Calculations were done using finite element (FE) method, Program Package
KOMIPS (author T. Maneski /1/). The basic elements for this analysis are disposition of
loading, distribution of membrane and bending stresses and distribution of deformation
energy. Membrane and bending stress might be calculated by beam and plate finite
elements. Relations between these two types of stresses in all elements of considered
construction are given for critical cross sections. Distribution of the deformation energy
across the groups of finite elements (elements of structure) is effective indicator for the
applicability of considered construction. Energy method in analysis is effective for the
selection of the reconstruction of the structure, if required.
Program package KOMIPS is presented here as applied for the analysis of stress and
strain fields, fields of deformation energy and eigen-frequences of different structures.
Following examples are presented:
1. Thermo-mechanical calculation of the reactors
2. Calculation of the strength of the claws
3. Thermo-mechanical calculation of the strain of the gas pipeline RTB BOR
4. Stressstate in the construction of an autoclave
5. Numerical and experimental diagnostic of the behaviour of the palet-pack machine
6. Diagnostic of the dynamic behaviour of a drive unit.
2. THERMO-MECHANICAL CALCULATION OF THE REACTORS
Models of different constructions of reactors (pressure vessel) were considered using
FE of thin plate. Consideration is performed for two loading situations:
1. combined effect of working pressure, weight and temperature;
2. pressure in hydraulic proof test and weight.
The appropriate values of pressure are presented in Table 2.1.
Dynamic calculation of eigen-oscilations had been performed for all types of analysed
reactors.
Reactors DC-301 and DC3-3, as typical, are presented and discussed more detailed.
Table 2.1: Working pressure and proof test pressure of analysed reactors
Reactor DC-301 DC-302 DC-303 DC-304 DC-401
Working pressure,bar 50 35 25 26 671
Proof testpressure, bar 106,9 108 109,39 108 112