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Theory of creep of initially strain-hardening isotropic materials

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Conclusions

We analyzed the status of the problem of developing governing equations of isotropic creep within the framework of a mechanical equation of state. The feasibility of using equations of the hereditary type to describe the third stage of creep was evaluated.

We also constructed a creep theory based on a refinement of the principle of the similarity of isochronic curves. This can be regarded as an attempt to generalize the concepts of mechanical equation of state and nonlinear heredity. The theory makes it possible to consider the initial strain-hardening of the medium, evaluate the third stage of creep, and take into account the history and cyclicity of loading.

It was shown that nonsteady creep develops in media which exhibit linear strain-hardening, while the development of all three stages of creep is possible in media characterized by exponential strain-hardening. It was discovered that there is a sudden increase in the rate of nonsteady creep under constant stress. The creep of certain structural materials under steady, stepped, and cyclic loading was calculated and satisfactory agreement was obtained with experimental results.

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Additional information

Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Prikladnaya Mekhanika, Vol. 25, No. 2, pp. 90–100, February, 1989.

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Golub, V.P. Theory of creep of initially strain-hardening isotropic materials. Soviet Applied Mechanics 25, 184–194 (1989). https://doi.org/10.1007/BF00888135

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Keywords

  • Structural Material
  • Cyclic Loading
  • Isotropic Material
  • Satisfactory Agreement
  • Sudden Increase