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Creep analysis with a stress range dependent constitutive model

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Abstract

Many materials exhibit the stress range dependent creep behavior. The power law creep observed for a certain stress range changes to the viscous type creep as the stress value decreases. Recently published experimental data for advanced heat resistant steels indicate that the high creep exponent (in the range 7–12) may decrease to the low value of approximately unity within the stress range relevant for engineering structures. The aim of this paper is to analyze the influence of the stress range dependent power-law-viscous creep transition on the behavior of structures at elevated temperature. A constitutive model for the minimum creep rate is introduced to describe both the linear and the power law creep depending upon the stress level. To demonstrate basic features of the stress range dependent creep modeling, several elementary examples from structural mechanics are presented. They include a stress relaxation problem, a beam subjected to pure bending and a pressurized thick-walled cylinder. Based on the uni-axial transition stress the transition value of the external load is estimated such that above this value the power law can be applied. For the loading levels below this value the character of the stress distribution as well as the stress values are essentially influenced by the viscous creep.

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Authors and Affiliations

  1. Center for Engineering Sciences, Martin-Luther-University Halle-Wittenberg, 06099, Halle, Germany

    Konstantin Naumenko, Holm Altenbach & Yevgen Gorash

Authors
  1. Konstantin Naumenko
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  2. Holm Altenbach
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  3. Yevgen Gorash
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Correspondence to Konstantin Naumenko.

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Naumenko, K., Altenbach, H. & Gorash, Y. Creep analysis with a stress range dependent constitutive model. Arch Appl Mech 79, 619–630 (2009). https://doi.org/10.1007/s00419-008-0287-5

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  • DOI: https://doi.org/10.1007/s00419-008-0287-5

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