The behaviour of ferritic weldments in thick section pipe at elevated temperature

Coleman, M.C.; Parker, J.D.; Walters, Donald L.

doi:10.1016/0308-0161(85)90015-8

Cited by 61 publications

(38 citation statements)

References 2 publications

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“…This approach has been shown to predict successfully the deformation, damage, and failure history of the full-size pressure vessel weldment tests of Coleman et al [7]. The research highlighted the important role of the difference in the creep characteristics of the weld metal, the heat-affected zone (HAZ) material, and the parent material.…”

Section: Introductionmentioning

confidence: 95%

CDM predictions of creep damage initiation and growth in ferritic steel weldments in a medium-bore branched pipe under constant pressure at 590° C using a four-material weld model

Mustata

Hayhurst

et al. 2006

Arch Appl Mech

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The paper reports the use of three-dimensional creep continuum damage mechanics techniques to study the creep failure of a medium-bore low-alloy ferritic-steel cylinder-cylinder branched pressure vessel welded connection, tested at a constant pressure of 4 MPa, at a uniform temperature of 590 • C. The development of computational techniques is reported to analyse this problem with a four-material model of the welded connection which includes: parent, type IV, heat-affected zone (HAZ) and weld materials. The results of analyses are presented for two sets of creep damage constitutive equations. For both equation sets, lifetimes are conservatively, yet accurately predicted; however, the results of metallographic examinations of a tested vessel are not accurately predicted. To overcome this deficiency further analyses of the vessel are recommended which include: a coarse-grained HAZ (CGHAZ), adjacent to the weld material; and, more-refined finite element modelling.

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Section: Introductionmentioning

confidence: 95%

CDM predictions of creep damage initiation and growth in ferritic steel weldments in a medium-bore branched pipe under constant pressure at 590° C using a four-material weld model

Mustata

Hayhurst

et al. 2006

Arch Appl Mech

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show abstract

“…This approach has been shown to predict successfully the deformation, damage and failure history of the full-size pressure vessel weldment tests of Coleman et al (1985). The research highlighted the important role of the difference in the creep characteristics of the weld metal, the heat affected zone (HAZ) material, and the parent material.…”

Section: Introductionmentioning

confidence: 99%

“…(b ) Material behaviour at 620 8C Coleman et al (1985) have shown that Norton's power law adequately describes the creep behaviour of the low alloy ferritic steel. Since the conventional single damage state variable theory (Hayhurst et al 1975;Hall & Hayhurst 1991;Wang & Hayhurst 1994a) is not capable of predicting softening due to carbide coarsening in low alloy ferritic steels, an additional state variable, F, has been introduced by Perrin & Hayhurst (1994a).…”

Section: Constitutive Equationsmentioning

confidence: 99%

High-temperature creep rupture of low alloy ferritic steel butt-welded pipes subjected to combined internal pressure and end loadings

Vakili‐Tahami

Hayhurst²,

Wong

2005

Phil. Trans. R. Soc. A.

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Constitutive equations are reviewed and presented for low alloy ferritic steels which undergo creep deformation and damage at high temperatures; and, a thermodynamic framework is provided for the deformation rate potentials used in the equations. Finite element continuum damage mechanics studies have been carried out using these constitutive equations on butt-welded low alloy ferritic steel pipes subjected to combined internal pressure and axial loads at 590 and 620 8C. Two dominant modes of failure have been identified: firstly, fusion boundary failure at high stresses; and, secondly, Type IV failure at low stresses. The stress level at which the switch in failure mechanism takes place has been found to be associated with the relative creep resistance and lifetimes, over a wide range of uniaxial stresses, for parent, heat affected zone, Type IV and weld materials. The equi-biaxial stress loading condition (mean diameter stress equal to the axial stress) has been confirmed to be the worst loading condition. For this condition, simple design formulae are proposed for both 590 and 620 8C.

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“…Most theoretical work has involved finite element models and results for pipe welds have been found, for instance, by Goodall and Waiters [1], Waiters [2], Coleman et al [3], Hall and Hayhurst [4] and Tu and SandstrOm [5]. Obtaining accurate finite element solutions for weldments is difficult and time consuming, however, due to the presence of very narrow material regions and stress singularities.…”

Section: Introductionmentioning

confidence: 99%

Modelling the creep of a pipe weld using Cosserat theory

Hawkes

Craine

1995

J Eng Math

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A mathematical model is developed which describes the steady state creep in a welded pipe which is subjected to a constant uniaxial end load and/or uniform internal and external pressure. The model is based on the Cosserat theory of plates and shells and a generalisation of Norton's law. Both asymptotic and analytical solutions are found and the results reveal that bending and thinning of the pipe take place on different length scales.

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The behaviour of ferritic weldments in thick section pipe at elevated temperature

Cited by 61 publications

References 2 publications

CDM predictions of creep damage initiation and growth in ferritic steel weldments in a medium-bore branched pipe under constant pressure at 590° C using a four-material weld model

CDM predictions of creep damage initiation and growth in ferritic steel weldments in a medium-bore branched pipe under constant pressure at 590° C using a four-material weld model

High-temperature creep rupture of low alloy ferritic steel butt-welded pipes subjected to combined internal pressure and end loadings

Modelling the creep of a pipe weld using Cosserat theory

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