Impact against X65 steel pipes – An experimental investigation

Kristoffersen, Martin; Westermann, Ida; Langseth, Magnus; Hopperstad, Odd Sture

doi:10.1016/j.ijsolstr.2013.06.013

Cited by 31 publications

(58 citation statements)

References 36 publications

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“…Jiang et al 2006;Palmer et al 2006;Ng and Shen 2006;Jones and Birch 2010;Jones 2010;Manes et al 2012;Kristoffersen et al 2013a). These pipes have been empty, filled with a variety of different media or pressurized.…”

Section: Introductionmentioning

confidence: 99%

Influence of sigma-phase precipitation on the impact behaviour of duplex stainless steel pipe fittings

Marken

Langseth

Rørvik

et al. 2014

Ships and Offshore Structures

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In this study, the effect of sigma phase precipitation in duplex stainless steel (grade 2205) pipe fittings collected from top-side process systems offshore was investigated under realistic loading conditions. This was done by conducting quasi-static and dynamic impact tests on 3" fittings with nominal outside diameter of 88.9 mm, nominal wall thickness of 3.05 mm and D/t-ratio of nearly 30. The fittings had a sigma phase level between 0 and 15 vol.%, and were loaded by a massive steel indenter with a hemispherical nose of 25 mm radius. In the quasi-static tests, the loading rate was 2 mm/min, while in the dynamic tests the impact velocity was varied between 5 and 10 m/s.A few dynamic impact tests on 2" fittings with an increased wall thickness and low sigma phase levels were carried out for comparison, while some 3" fittings were pre-charged with hydrogen before dynamic testing to examine the effect of sigma phase on cathodic protected subsea components. When the sigma phase level was low (i.e., 5 vol.%   ), no evidence of fracture was found in any of the pipe fittings, whereas at higher sigma phase levels

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Section: Introductionmentioning

confidence: 99%

Influence of sigma-phase precipitation on the impact behaviour of duplex stainless steel pipe fittings

Marken

Langseth

Rørvik

et al. 2014

Ships and Offshore Structures

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“…Quasi-static material tests investigating the cross-sectional homogeneity and possible anisotropy of this material have been carried out [7], and are succinctly summarised here. Specimens of geometry as shown in Fig.…”

Section: Materials Tests 45mentioning

confidence: 99%

“…The material strain hardens to a true peak stress of 1 314 ± 12 MPa and fails at a true strain 55 of 1.61 ± 0.03 in a ductile cup-and-cone fracture mode. This study does not include investigation of fracture, which has been studied elsewhere [7,42]. All tests (both material and component) are carried out at room temperature, so no investigation into temperature effects is made although such effects may be present in both arctic environments and dynamic events [43].…”

Section: Materials Tests 45mentioning

confidence: 99%

“…matrix [7]. Still, no fracture was observed, even close to the particles (dark areas) where fracture is typically found in this material [42].…”

mentioning

confidence: 95%

“…The load sequence 5 of denting followed by stretching was applied quasi-statically to strips of an X65 pipeline material by Manes et al [6], without producing any significant cracks. Further, Kristoffersen et al [7] carried out dynamic impact tests on simply supported pipes followed by quasi-static stretching of the dented pipes to emulate the rebound of a pipeline after release from a hooking event. The subsequent stretching always resulted…”

Section: Introductionmentioning

confidence: 99%

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Combined three-point bending and axial tension of pressurised and unpressurised X65 offshore steel pipes – Experiments and simulations

Kristoffersen

Langseth

2018

Marine Structures

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Subsea pipelines are occasionally struck and hooked by objects such as anchors or trawl gear. The initial denting, followed by potential hooking and displacement of the pipeline, give rise to a complex load and deformation history. Transverse displacements cause a simultaneous increase in tensile axial forces, further complicating the load sequence. This study examines the effect of applying one of three different axial loads (zero, constant, and linearly increasing) to a pipe while simultaneously deforming it transversely. The three tests were repeated with an internal pressure of 10 MPa (100 bar), and all tests were recreated numerically in finite element simulations using both iterative (implicit) and non-iterative (explicit) approaches. As expected, adding an axial load increased the pipe's resistance to bending in terms of force-displacement, and the same can be said of including internal pressure. However, a more localised dent was observed in the pressurised pipes, which in turn could affect the onset of failure. The experimental results were well captured by the finite element simulations.

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A New Method of Fringe Pattern Analysis

Sciammarella

Lamberti

2018

Advancement of Optical Methods &Amp; Digital Image Correlation in Experimental Mechanics, Volume 3

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Impact against X65 steel pipes – An experimental investigation

Cited by 31 publications

References 36 publications

Influence of sigma-phase precipitation on the impact behaviour of duplex stainless steel pipe fittings

Influence of sigma-phase precipitation on the impact behaviour of duplex stainless steel pipe fittings

Combined three-point bending and axial tension of pressurised and unpressurised X65 offshore steel pipes – Experiments and simulations

A New Method of Fringe Pattern Analysis

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