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The influence of material anisotropy and spiral welding on tensile strain capacity of spiral welded pipes

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Abstract
The longitudinal strain capacity of spiral welded pipelines displays to some extents unexplained behaviour. Therefore, they are not (yet) used extensively in offshore applications and harsh conditions, demanding a strain based design. An important factor that influences the tensile strain capacity is the quantity of anisotropy in terms of strength and toughness. Starting from an anisotropic hot rolled highstrength steel skelp, the process of helical forming and post-treating of the pipe adds heterogeneity and changes the level of anisotropy of the product. A parameter that should be examined with respect to anisotropy is the crack driving force, a measure for the toughness of the pipeline steel. Additional to the mode I loading (opening of the crack), the mode III component drives the in-plane shear motion of a crack in the spiral weld when the pipe is subjected to longitudinal deformation. This action, not present in longitudinal welded pipes, shows a decreasing contribution with increasing plasticity. FE simulations have demonstrated a rise of crack driving force in anisotropic cases with respect to an isotropic reference. However, exact data and variation of various parameters, along with experimental testing need to be conducted. The outcome analysis of such simulations and tests can validate existing models, or help create a better understanding of anisotropic and heterogenic influences on the tensile strain capacity of spiral welded pipes.
Keywords
Spiral welded pipeline, tensile strain capacity, strain based design, heterogeneity, anisotropy

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Chicago
De Backer, Michiel, Koen Van Minnebruggen, and Wim De Waele. 2015. “The Influence of Material Anisotropy and Spiral Welding on Tensile Strain Capacity of Spiral Welded Pipes.” Ed. Stijn Hertelé and Jeroen Van Wittenberghe. Sustainable Construction and Design 6 (3).
APA
De Backer, Michiel, Van Minnebruggen, K., & De Waele, W. (2015). The influence of material anisotropy and spiral welding on tensile strain capacity of spiral welded pipes. (S. Hertelé & J. Van Wittenberghe, Eds.)SUSTAINABLE CONSTRUCTION AND DESIGN, 6(3).
Vancouver
1.
De Backer M, Van Minnebruggen K, De Waele W. The influence of material anisotropy and spiral welding on tensile strain capacity of spiral welded pipes. Hertelé S, Van Wittenberghe J, editors. SUSTAINABLE CONSTRUCTION AND DESIGN. 2015;6(3).
MLA
De Backer, Michiel, Koen Van Minnebruggen, and Wim De Waele. “The Influence of Material Anisotropy and Spiral Welding on Tensile Strain Capacity of Spiral Welded Pipes.” Ed. Stijn Hertelé & Jeroen Van Wittenberghe. SUSTAINABLE CONSTRUCTION AND DESIGN 6.3 (2015): n. pag. Print.
@article{6868779,
  abstract     = {The longitudinal strain capacity of spiral welded pipelines displays to some extents unexplained behaviour. Therefore, they are not (yet) used extensively in offshore applications and harsh conditions, demanding a strain based design. An important factor that influences the tensile strain capacity is the quantity of anisotropy in terms of strength and toughness. Starting from an anisotropic hot rolled highstrength steel skelp, the process of helical forming and post-treating of the pipe adds heterogeneity and changes the level of anisotropy of the product. A parameter that should be examined with respect to anisotropy is the crack driving force, a measure for the toughness of the pipeline steel. Additional to the mode I loading (opening of the crack), the mode III component drives the in-plane shear motion of a crack in the spiral weld when the pipe is subjected to longitudinal deformation. This action, not present in longitudinal welded pipes, shows a decreasing contribution with increasing plasticity. FE simulations have demonstrated a rise of crack driving force in anisotropic cases with respect to an isotropic reference. However, exact data and variation of various parameters, along with experimental testing need to be conducted. The outcome analysis of such simulations and tests can validate existing models, or help create a better understanding of anisotropic and heterogenic influences on the tensile strain capacity of spiral welded pipes.},
  author       = {De Backer, Michiel and Van Minnebruggen, Koen and De Waele, Wim},
  editor       = {Hertel{\'e}, Stijn and Van Wittenberghe, Jeroen },
  issn         = {2032-7471},
  journal      = {SUSTAINABLE CONSTRUCTION AND DESIGN},
  language     = {eng},
  number       = {3},
  pages        = {9},
  title        = {The influence of material anisotropy and spiral welding on tensile strain capacity of spiral welded pipes},
  url          = {http://ojs.ugent.be/SCAD/article/view/1132},
  volume       = {6},
  year         = {2015},
}