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Modelling Creep and Fracture in Engineering Alloys

  • B. F. Dyson

Abstract

Metallic materials exhibit three stages of creep; a primary decelerating rate, a secondary constant rate and a tertiary accelerating rate. Fig. 1 illustrates the three stages in terms of a graph of creep strain, ∈, as a function of the dimensionless parameters t/tf, where t is time and tf the time to fracture. The life-fraction, t/tf, occupied by each stage is not invariant, even within a single alloy system : test data indicate that the relative fractions depend upon :
  1. i

    metallurgical variables — trace element content and processing history

     
  2. ii

    engineering variables — testing temperature, stress level and stress state. Chemical reactivity and pressure of the surrounding fluid phase.

     

Keywords

Creep Rate Creep Strain Creep Curve Processing History Trace Element Content 
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

© ECSC, EEC, EAEC, Brussels and Luxembourg 1987

Authors and Affiliations

  • B. F. Dyson
    • 1
  1. 1.Division of Materials ApplicationsNational Physical LaboratoryMiddlesexUK

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