We study the regularities of deformation of 1Kh18N9T steel under long-term static loading along different paths of radial loading with regard for the influence of the type of stressed state. The viscoplastic properties of 08Kh18N10T-VD steel subjected to stepwise static loading under conditions of complex stressed state are analyzed.Keywords: heat-resistant steels, long-term and stepwise static loading, complex stressed state, degree of damage, viscoplastic properties of steel.Introduction. The major part of actual structural elements suffer the action of complex thermomechanical loading in the process of operation, which substantially affects their load-carrying capacity. From the viewpoint of improvement of the numerical methods used for the analyses of structural elements, it is necessary to perform comprehensive investigations of the properties of various metals and alloys in the process of creep under conditions of complex stressed state.The analysis of the well-known data obtained as a result of long-term testing of structural materials operating under conditions of complex stressed state shows that the processes of plastic deformation of materials in creep strongly depend on the type of stressed state [1-7 and others].The results of numerical analyses of the structural elements operating under conditions of creep are, as a rule, based on the data obtained in the case of uniaxial tension. At the same time, the attempts to generalize the equations of creep deduced and experimentally substantiated for the uniaxial stressed state to the case of arbitrary systems of stresses by introducing certain generalized stresses without taking into account the influence of the first invariant of the stress tensor and the third invariant of the stress deviator on the mechanical properties of materials are not always correct.In the present work, we consider the regularities of deformation of heat-resistant steels subjected to long-term static loading along different paths of radial loading (1Kh18N9T, T =°600 C) and stepwise static loading (08Kh18N10T-VD, T =°320 C) under conditions of complex stressed state.Influence of the Form of Stressed State on the Minimum Intensity of Creep Strain Rates. In Fig. 1, we present the experimental dependences of the minimum intensity of creep rates x ic min on the intensity of stresses s i constructed for 1Kh18N9T steel at 600°C according to the results from [8]. It is easy to see that these plots depend on the form of the stressed state. This is explained by the fact that the same value of s i obtained for different paths of radial loading (Fig. 2) [9] leads to the accumulation of different degrees of damage w j to the material for different types of the stressed state.
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