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Design and material issues in improving fracture/fatigue resistance and structural integrity in power plants

J.F. Knott,    The University of Birmingham, UK

Abstract:

The chapter begins by giving examples of ‘fast fracture’ in power plant components in normal design, conforming to standard codes. Fracture requires the presence of stress concentrators, which may be features of design, such as keyways, often in combination with defects produced by the manufacturing processes. The principles of fracture mechanics are described and the failure assessment diagram (FAD) is introduced. Particular attention is paid to the grain-boundary embrittlement of power plant steels, both during heat treatment and in service. Traditional approaches to design ...

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