0

Full Content is available to subscribers

Subscribe/Learn More  >

Reeling Analysis Including Strain Concentrations at Girth Welds

[+] Author Affiliations
Tore Soreide, Sigurd Trier

REINERTSEN AS, Trondheim, Norway

Bo Erixon

REINERTSEN Sverige AB, Stockholm, Sweden

Paper No. OMAE2010-20486, pp. 575-580; 6 pages
doi:10.1115/OMAE2010-20486
From:
  • ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
  • 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts A and B
  • Shanghai, China, June 6–11, 2010
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4913-2 | eISBN: 978-0-7918-3873-0
  • Copyright © 2010 by ASME

abstract

Dimensional variations across a girth weld undergoing reeling leads to strain concentrations close to the weld that have to be taken into consideration in crack growth evaluations. The aim of the present paper is to outline an analysis procedure for simulating the complex load history, and to illustrate the effect of material and wall thickness variations between the two joints on each side of the girth weld. Verification analyses are also made towards full-scale tests simulating the cyclic loading during the reeling process. The computer software ANSYS was applied with contact and plasticity formulation, and the load history through reel, aligner and straightener was modelled. A combination of beam and shell elements was applied for the pipe, ending up in an efficient tool for design analysis. The nonlinear material model included kinematic hardening and was based upon a Ramberg-Osgood type of stress-strain curve. The effect of kinematic hardening through cyclic loading was studied in an effort to define the material properties of the as-installed pipe. The numerical model also came out with contact pressures between the reel and the pipe, being of special interest for thermally coated pipes. Ovalisation of the pipe was available, and goes into the bending moment capacity for expansion control. A full-scale bending test of clad pipe around a girth weld was performed, simulating the load history through the reeling process. Measured strains and forces were compared with numerical results as a verification of the analysis model. A separate ANSYS model was created for the test case, based on the material models in the global model. The location of strain concentrations in the vicinity of the girth weld was given special attention in the comparison between tests and numerical simulation. Material tests for backing steel and clad, respectively, around the circumference of the as-tested pipe illustrate the strain hardening effect as basis for evaluation of the kinematic hardening parameters implemented in the numerical models. Analyses were then used for a parameter study on strain concentrations with yield stress and wall thickness variations across the girth weld. Also, the amplifying effect of local buckling during reeling is evaluated, as basis for defining needed back-tension.

Copyright © 2010 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In