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Crack Initiation and Growth During Thermal Transients

  • R. P. Skelton
Part of the International Centre for Mechanical Sciences book series (CISM, volume 389)

Abstract

This chapter follows the course of a crack in a typical component from the initiation and short crack growth stage, through to the deep crack growth stage and on to the possibility of complete penetration across the wall thickness. The causes of such growth are considered, such as thermal shock and other constraints against expansion or contraction and the many ways of simulating propagation behaviour in the laboratory are discussed, where a cyclic event in service is identified with a fatigue cycle performed in the laboratory. Parameters which are used to describe crack growth in the various regions are explained, together with methods of accounting for internal structural damage in the material (‘creep-fatigue interaction’) which is observed to enhance crack growth rates. Many worked examples are given, either to illustrate a technical point or based on service experience. Finally, a complete case study (retrospective analysis) of crack propagation across a component in power plant is undertaken together with a validation of the calculations.

Keywords

Crack Initiation Crack Growth Rate Crack Depth Plastic Zone Size Creep Damage 
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 Wien 1998

Authors and Affiliations

  • R. P. Skelton
    • 1
  1. 1.Technology and MedicineImperial College of ScienceLondonUK

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