CONSTRUCTIONAL MATERIALS DURABILITY REGARDING THE THIRD INVARIANT INFLUENCE OF A STRESS DEVIATOR IN THE CONDITION OF COMBINED STRESS

Authors

  • Т. Н. Можаровская National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine
  • В. Н. Можаровский National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine

DOI:

https://doi.org/10.20535/2305-9001.2014.70.34576

Keywords:

creep-rupture strength, third invariant of the stress deviator, long-term static loading

Abstract

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.

Author Biographies

Т. Н. Можаровская, National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv

к.т.н., доц.

В. Н. Можаровский, National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv

к.т.н., доц.

References

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Published

2014-12-22

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