Creep crack growth testing of P91 and P22 pipe bends

Gampe, Uwe; Seliger, P.

doi:10.1016/s0308-0161(01)00100-4

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…This is mainly due to the low frequency dwell times of 10 -4 Hz used. Furthermore, in all cases the fracture surfaces were seen to be predominantly intergranular [19,22] suggesting pre-dominance of time-dependant cracking behaviour in the cyclic tests.…”

Section: Andmentioning

confidence: 85%

“…All the pipe and compact tension specimens were taken from the same batch of steel. The study formed part of a European Union collaborative programme called 'HIDA' [7,[18][19]. A total of 2 straight and 2 bent pipes was examined and all testing was carried out at 625°C.…”

Section: Methodsmentioning

confidence: 99%

“…3. All defects were made using EDM, as described earlier, and their initial dimensions are given in Table 3 [19].…”

Section: Methodsmentioning

confidence: 99%

“…The test procedure for each pipe was very similar to each other [18][19]. The straight pipe tests were performed at JRC (Petten) and the bend pipe tests at SPG in Dresden.…”

Section: Methodsmentioning

confidence: 99%

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Creep crack initiation and growth in thick section steel pipes under internal pressure

Wasmer

Nikbin

Webster

2003

International Journal of Pressure Vessels and Piping

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In this study, creep crack growth in pre-cracked straight and bent pipes of a 9% Cr-steel, containing multiple cracks and tested at 625°C under static and slow cyclic pressure loading, is investigated. The results have been interpreted in terms of the creep fracture mechanics parameter C* and compared with data obtained on standard compact tension (CT) specimens of the same material and batch. In making the assessments, reference stress methods have been used to determine C* for the pipes. Several formulae can be employed for calculating reference stress depending on whether it is based on a 'global' or a 'local' collapse mechanism. When using this approach, it is shown that the values obtained for C* are sensitive to the material properties, geometric dimensions and crack lengths chosen in the analysis. However, it has been found that, the most satisfactory comparison of crack growth rates with standard CT specimen data is obtained when the 'global' reference stress solution is used in conjunction with the nominal thickness of a pipe and the mean parent uniaxial creep properties. Also, no difference has been observed between the crack growth rates measured in the straight and bent pipes. The main effect of the slow pressure cycling was to cause an acceleration in the early stages of cracking.

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Section: Andmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Creep crack initiation and growth in thick section steel pipes under internal pressure

Wasmer

Nikbin

Webster

2003

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

show abstract

“…Results of CCI and CCG tests on the pressurized tubes and pipes have been reported previously [26,[27][28][29]. The dimensions of the pipes and tubes and pressures applied are given in Table 6.…”

Section: Experimental Datamentioning

confidence: 99%