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

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

Sample text

Note, however, that caution has to be exercised for structures with multiple load paths, as the failure of one load path will affect the stress distribution on the remaining uncracked path(s). 2. Primary and Secondary Stresses In the analyses, the stresses are categorised as primary or secondary. As a rule, primary stresses arise from the applied mechanical load, including any dead weight or inertia effects, whilst secondary stresses result from suppressed local distortions, for example during the welding process, or are due to thermal gradients.

If the component is stiffer than the substitute geometry the resulting K-factor will be over-estimated and, thus, conservative. According to Fig. 4), a special feature of the membrane and bending stress components is their dependency on the crack length. 2, the bending stress will become smaller and the membrane stress larger for a crack size greater than the assumed a/t = 0 3. 4: Determination of K-factors using substitute geometries. The Input Parameters 35 with F being the tensile force, A the cross section area, Mb the bending moment and Wb the section modulus.

2. Basic Crack Types Flaw characterisation means that an existing or postulated crack is modelled by a simpler geometry such as a through crack with a straight crack front, an embedded crack with elliptical shape or a surface crack with a semi-elliptical shape. The basic types of idealised planar flaws are given in Fig. 5. 11. 3. Crack Shape Idealisation Crack shape idealisation becomes necessary when real cracks have been detected during an inspection. Idealisation means that a flaw or crack with a complex The Input Parameters 37 shape is modelled as one of the basic crack types shown in Fig.

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