Scipediacontent at 11:35, 28 February 2022

2022-02-28T11:35:10Z

Scipediacontent: Scipediacontent moved page Draft Content 982555034 to Bonisch et al 2022a

2022-02-28T10:29:43Z

Scipediacontent moved page Draft Content 982555034 to Bonisch et al 2022a

Scipediacontent: Created page with "== Abstract == Spiral forming is a widely used industrial method for the manufacture of large diameter welded pipes from levelled steel strip. However, the multi-step helical..."

2022-02-28T10:29:40Z

Created page with "== Abstract == Spiral forming is a widely used industrial method for the manufacture of large diameter welded pipes from levelled steel strip. However, the multi-step helical..."

New page

== Abstract ==

Spiral forming is a widely used industrial method for the manufacture of large diameter welded pipes from levelled steel strip. However, the multi-step helical forming process
and post-treatment of the pipe influence the material behavior and alter the final mechanical
anisotropy of the product. In addition, the complex microstructures of modern pipeline steels
contain various sources of anisotropy including residual stresses, crystallographic and
morphologic textures, and directional dislocation substructures. They do not only affect the
local and global pipe strength, ductility and toughness during monotonic loading but also cause
strong strain path change effects, e.g. a pronounced Bauschinger effect. Anisotropy thus poses
a true challenge to pipeline designers making it difficult to accurately predict the final pipe
behavior from the known properties of the hot-rolled high-strength coil, the starting point of the
forming process. Still, such predictive power is vital to guarantee the structural integrity of
pipelines without failure in case of in-service loads beyond the elastic range. The pipe
manufacturing process can be simplified into two steps: decoiling (incl. levelling) and spiral
forming. For subsequent quality control, samples are extracted from the pipe, per standard
flattened and tensile tested in hoop direction. With regard to developing a computational twin
of the complete manufacturing and testing process, we represent each step by a separate finite
element (FE) model. The full through-process simulation workflow thus necessitates tools to
transfer the material state between individual FE models. Here, we present such a workflow for
the dislocation substructural hardening model by [Peeters et al., Acta Mater. (2001) 49:1607-
1619]. For each material point, macroscopic and microscopic state variables, including residual
stress, crystallographic texture and dislocation densities, are first interpolated and then
transferred to the next model. In this way, the evolution of different anisotropy sources can be
studied starting from coil via pipe and ending with tensile testing

== Video ==
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== Document ==
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Bonisch et al 2022a - Revision history

Scipediacontent at 11:35, 28 February 2022

Scipediacontent: Scipediacontent moved page Draft Content 982555034 to Bonisch et al 2022a

Scipediacontent: Created page with "== Abstract == Spiral forming is a widely used industrial method for the manufacture of large diameter welded pipes from levelled steel strip. However, the multi-step helical..."