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Abstract
The strain capacity of pipes under combined loading is an important research topic within strain-based design. While strain capacity equations assume homogeneous pipe material properties, a realistic pipeline shows scatter in mechanical properties. Test and simulation programs have indicated that this "pipe heterogeneity" may reduce the tensile strain capacity under uniaxial loading by a factor up to two. To date, its effect in other scenarios (compressive; combined internal pressure and axial plastic deformation) has received little attention. To investigate these scenarios and compare them with uniaxial tensile loading, Europipe, Salzgitter Mannesmann Forschung (SZMF) and Soete Laboratory, UGent have set up a large-scale test program on UOE pipe X70 (OD = 1219 mm, WT = 17.5 mm), comprising a full-scale pressurized bend test and curved wide plate tension tests. All tested welds joined pipes with nominally equal pipe grade from the same pipeline project, with strongly different actual properties. Optical full field strain measurements by means of digital image correlation reveal local effects of pipe heterogeneity on the strain distribution in the vicinity of the girth weld. All tests showed pronounced degrees of non-uniformity in strain development, in some cases even inhibiting plastic deformation in the stronger material as its weaker counterpart collapses. Implications of the observations with respect to strain based design are discussed.
Keywords
PIPE STEEL HETEROGENEITY

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Citation

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MLA
Hoehler, Susanne et al. “Influence of Material Heterogeneity on the Strain Capacity of Pipelines.” PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2. New York: Amer Soc Mechanical Engineers, 2018. Print.
APA
Hoehler, S., Mondry, A., Kalwa, C., Samadian, K., De Waele, W., & Hertelé, S. (2018). Influence of material heterogeneity on the strain capacity of pipelines. PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2. Presented at the 12th International Pipeline Conference (IPC 2018), New York: Amer Soc Mechanical Engineers.
Chicago author-date
Hoehler, Susanne, Andreas Mondry, Christoph Kalwa, Kaveh Samadian, Wim De Waele, and Stijn Hertelé. 2018. “Influence of Material Heterogeneity on the Strain Capacity of Pipelines.” In PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2. New York: Amer Soc Mechanical Engineers.
Chicago author-date (all authors)
Hoehler, Susanne, Andreas Mondry, Christoph Kalwa, Kaveh Samadian, Wim De Waele, and Stijn Hertelé. 2018. “Influence of Material Heterogeneity on the Strain Capacity of Pipelines.” In PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2. New York: Amer Soc Mechanical Engineers.
Vancouver
1.
Hoehler S, Mondry A, Kalwa C, Samadian K, De Waele W, Hertelé S. Influence of material heterogeneity on the strain capacity of pipelines. PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2. New York: Amer Soc Mechanical Engineers; 2018.
IEEE
[1]
S. Hoehler, A. Mondry, C. Kalwa, K. Samadian, W. De Waele, and S. Hertelé, “Influence of material heterogeneity on the strain capacity of pipelines,” in PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2, Calgary, CANADA, 2018.
@inproceedings{8628824,
  abstract     = {The strain capacity of pipes under combined loading is an important research topic within strain-based design. While strain capacity equations assume homogeneous pipe material properties, a realistic pipeline shows scatter in mechanical properties. Test and simulation programs have indicated that this "pipe heterogeneity" may reduce the tensile strain capacity under uniaxial loading by a factor up to two. To date, its effect in other scenarios (compressive; combined internal pressure and axial plastic deformation) has received little attention. To investigate these scenarios and compare them with uniaxial tensile loading, Europipe, Salzgitter Mannesmann Forschung (SZMF) and Soete Laboratory, UGent have set up a large-scale test program on UOE pipe X70 (OD = 1219 mm, WT = 17.5 mm), comprising a full-scale pressurized bend test and curved wide plate tension tests. All tested welds joined pipes with nominally equal pipe grade from the same pipeline project, with strongly different actual properties. Optical full field strain measurements by means of digital image correlation reveal local effects of pipe heterogeneity on the strain distribution in the vicinity of the girth weld. All tests showed pronounced degrees of non-uniformity in strain development, in some cases even inhibiting plastic deformation in the stronger material as its weaker counterpart collapses. Implications of the observations with respect to strain based design are discussed.},
  articleno    = {V002T06A004},
  author       = {Hoehler, Susanne and Mondry, Andreas and Kalwa, Christoph and Samadian, Kaveh and De Waele, Wim and Hertelé, Stijn},
  booktitle    = {PROCEEDINGS OF THE 12TH INTERNATIONAL PIPELINE CONFERENCE, 2018, VOL 2},
  isbn         = {9780791851876},
  issn         = {1537-6788},
  keywords     = {PIPE STEEL HETEROGENEITY},
  language     = {eng},
  location     = {Calgary, CANADA},
  pages        = {11},
  publisher    = {Amer Soc Mechanical Engineers},
  title        = {Influence of material heterogeneity on the strain capacity of pipelines},
  year         = {2018},
}

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