CONSTRUCTIONAL MATERIALS DURABILITY REGARDING THE THIRD INVARIANT INFLUENCE OF A STRESS DEVIATOR IN THE CONDITION OF COMBINED STRESS
DOI:
https://doi.org/10.20535/2305-9001.2014.70.34576Keywords:
creep-rupture strength, third invariant of the stress deviator, long-term static loadingAbstract
The paper deals with the problem of estimating the durability of a thin-walled cylindrical shell involving plastoelastic deformation under the conditions of a prolonged static loading and combined stress that is relevant to the resource evaluation of constructional elements operating under the influence of a wide range of factors that have a significant impact on their load carrying capability.
The paper presents the experimental patterns of long-term strength of 15Х2МФА steel and a conjoint curve of long-term strength of 1Х18Н9Т steel in relative coordinates and in the condition of creeping and combined stress which strongly prove that the processes of a plastic deformation and damage by a prolonged static loading for different trajectories of a proportional loading significantly depend on the type of a stress state.
The influence of the third invariant of a stress deviator is examined on the basic characteristic of constructional materials durability that will further allow to prove approaches to the resource evaluation regarding operational factors.References
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