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Creep and Long-Term Strength at Stationary Stresses and Temperatures

  • Boris F. ShorrEmail author
Chapter
Part of the Foundations of Engineering Mechanics book series (FOUNDATIONS)

Abstract

The developed computational models for creep and long-term strength of structural materials under multi-axial proportional loading associated with steady or monotonically varying mechanical and thermal disturbances are justified using numerous experimental data. Specialized and generalized models for non-isothermal creep and ranges of applicability are discussed. A complete three-stage creep diagram is also presented. The latter may be described by six material parameters depending upon stress and temperature. Creep of statically determinate and indeterminate mechanical systems is considered along with computational methods oriented to the prescribed kinematic laws of steady creep velocity distribution over a body. Several examples for various creep conditions show that the stress field resulting from external loading, and especially induced by non-uniform thermal expansion, may deviate considerably from the field corresponding to purely elastic calculation and also from that related to the average body temperature. In case of creep, temperature variation makes a major impact on stress redistribution caused by stress relaxation as well as on the magnitude of residual stresses originated from unloading and cooling. The possibility for predicting structure durability in case of long-term maintenance is addressed, including equivalent trials under heavier stress and temperature conditions.

Keywords

Creep Rate Creep Strain Creep Deformation Creep Curve Steady Creep 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Central Institute of Aviation Motors (CIAM)MoskvaRussia

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