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By Uwe Zerbst, Manfred Schodel, Stephen Webster, Robert Ainsworth

ISBN-10: 0080449476

ISBN-13: 9780080449470

ISBN-10: 0080552838

ISBN-13: 9780080552835

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Extra resources for Fitness-for-Service Fracture Assessment of Structures Containing Cracks: A Workbook based on the European SINTAP FITNET procedure (Advances in Structural Integrity)

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In contrast to the FAD philosophy used in R6, the CDF philosophy strictly separates the applied and material sides. The determination of the crack driving force in the component and its comparison with the fracture resistance of the material are two separate steps. 19]. In contrast to the CEGB-FAD, the EPRI-FAD is based on the yield load FY instead of the collapse load Fpc of the cracked component and the FAD line becomes a function of the strain hardening of the material. The advantage of the EPRI approach is that it is based on finite element analyses although the solutions in the EPRI handbook are restricted to 2D calculations.

Caution has to be exercised when the crack is small compared to the spatial extent of the secondary stress distribution, or in cases with significant elastic follow-up from the rest of the structure. If it is uncertain whether a stress is primary or secondary, its treatment as primary is conservative. 3. Definition of the Stress Profile for Use with the K-Factor The stress profile can be approximated by a polynomial expression or it can be linearized. If possible, the former method is to be preferred.

18]. The following explanations refer to the J-integral as the crack driving force parameter. Note, however, that solutions for CTOD in terms of the 45 definition (see the Glossary “crack tip opening displacement”) are available as well. 4) The small scale yielding part, Jssy , is obtained from the elastic stress intensity factor with minor adjustments based on plastic zone corrections to the crack size (see the Glossary “crack tip plasticity”). For the plastic part, the HRR (Hutchinson-Rice-Rosengreen) field equation (see the Glossary “crack tip opening 12 Fitness-for-Service Fracture Assessment of Structures Containing Cracks displacement” and “J-integral”) is solved for J.

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Fitness-for-Service Fracture Assessment of Structures Containing Cracks: A Workbook based on the European SINTAP FITNET procedure (Advances in Structural Integrity) by Uwe Zerbst, Manfred Schodel, Stephen Webster, Robert Ainsworth


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