The σ0 Approach to Creep and Fracture of Metals and Alloys

  • B. Wilshire
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


The different values reported for the stress and temperature dependences of the creep rates for a wide range of metals and alloys can be rationalized as
$$ \dot \varepsilon _s = A*(\sigma - \sigma _o )^P \exp ^{ - Q*_c } /RT $$
The parameter, σo, varies with stress and temperature such that p ≃ 4 and Q c * for particle-strengthened alloys is equal to the activation energy for creep of the single-phase matrix material. The physical significance of σo is considered in terms of the mechanisms controlling creep in various stress/temperature regimes and the approach developed is used to examine the effects of microstructural changes during long-term exposure of low-alloy steels and nickel-base super-alloys at elevated temperatures.


Creep Rate Creep Behaviour Stress Exponent Minimum Creep Rate Rupture Life 
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Copyright information

© Springer-Verlag, Berlin, Heidelberg 1981

Authors and Affiliations

  • B. Wilshire
    • 1
  1. 1.Department of Metallurgy and Materials TechnologyUniversity CollegeSingleton Park, SwanseaUK

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