Effects of specimen geometry and anisotropic material response on the tensile strain capacity of flawed spiral welded pipes

Large-diameter spiral-welded pipes are employed in demanding hydrocarbon pipeline applications, which require an efficient strain-based design framework. In the course of a large European project, numerical simulations on spiral-welded pipes are conducted to examine their bending deformation capacity in the presence of internal pressure referring to geohazard actions, as well as their capacity under external pressure for offshore applications in moderate deep water. Numerical models that simulate the manufacturing process (decoiling and spiral cold bending) are employed. Subsequently, the residual stresses due to cold bending are used to examine the capacity of pipe under external pressure and internally-pressurized bending. A parametric analysis is conducted to examine the effect of spiral cold forming process on the structural behavior of spiral welded pipes and the effect of internal pressure on bending capacity. The results from the present study support the argument that spiral-welded pipes can be used in demanding onshore and offshore pipeline applications.

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“…is the elastic trial stress, and (11) Furthermore, integration of the back-stress evolution equation 4…”

Section: Numerical Implementation Of Constitutive Modelmentioning

confidence: 99%

The Effect of Spiral Cold-Bending Manufacturing Process on Pipeline Mechanical Behavior

Chatzopoulou

Sarvanis

Papadaki

et al. 2016

Volume 3: Operations, Monitoring and Maintenance; Materials and Joining

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“…They performed a large series of finite element analysis (FEA) simulations and tests of CWPs to quantify the effect of pipe steel heterogeneity on strain capacity and proposed a new strain capacity equation. Van Minnebruggen et al (Van Minnebruggen et al, 2015), investigated the effect of the pipe forming angle, weld strength overmatch and material strength anisotropy on tensile strain capacity and emphasized that ignoring anisotropy in FEA may overestimate the strain capacity. Bastola et al (2017), carried out a literature review, small-scale testing, full-scale pipe bending and reeling tests, and detailed FEA to investigate the strain capacity of girth-welded X80 pipes.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the strain capacity of girth-welded X80 grade pipes

et al. 2022

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“…The bending deformation response of large-diameter spiral-welded tubes tested in [4] was simulated numerically by Vasilikis et al [10] and a very good comparison with the test results was found; this work has also been a first attempt to account for the manufacturing process effects on structural performance in a rigorous manner. More recently, using parametric finite element analyses, Van Minnebruggen et al [11] studied the influence of pipe forming angle, weld strength overmatch and material strength anisotropy on the tensile strain capacity of flawed spiral welded pipes.…”

Section: Introductionmentioning

confidence: 99%

The effect of spiral cold-bending manufacturing process on pipeline mechanical behavior

Chatzopoulou

Sarvanis

Karamanos

et al. 2019

International Journal of Solids and Structures

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Large-diameter steel pipes, fabricated through the spiral-welding manufacturing process, are extensively used in onshore pipelines for the transmission of energy (hydrocarbon) and water resources. However, their use in demanding applications, such as geohazard areas or in offshore applications has been very limited. Safeguarding the structural integrity in such areas of those pipes requires an efficient strain-based design framework. Bending deformation capacity in the presence of internal pressure is the major loading case under geohazard actions, whereas external pressure capacity governs the mechanical design in moderate-deep offshore applications. To predict accurately the structural performance of spiral-welded pipes, the coldbending manufacturing process should be taken into account. In the present paper, numerical models are developed simulating both the cold-bending process (decoiling and spiral bending) and the structural response of the pipe subjected to the loading conditions under consideration.The numerical modes have been verified against experimental results of spiral pipes conducted in the framework of a European research project. A parametric analysis is also conducted to examine the effect of spiral cold forming process on the structural behavior of spiral welded pipes. The results from the present study indicate that spiral-welded pipes can sustain significant amount of bending deformation and external pressure, in favor of their use in demanding onshore and moderately deep offshore pipeline applications.

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Effects of specimen geometry and anisotropic material response on the tensile strain capacity of flawed spiral welded pipes

Cited by 8 publications

References 30 publications

The Effect of Spiral Cold-Bending Manufacturing Process on Pipeline Mechanical Behavior

The Effect of Spiral Cold-Bending Manufacturing Process on Pipeline Mechanical Behavior

Numerical study on the strain capacity of girth-welded X80 grade pipes

The effect of spiral cold-bending manufacturing process on pipeline mechanical behavior

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