Fracture Toughness Testing for Improving the Safety of Gas Pipelines

Ľubomír Gajdoš; Martin Šperl

doi:10.4028/www.scientific.net/AMM.821.464

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 821Fracture Toughness Testing for Improving the...

Fracture Toughness Testing for Improving the Safety of Gas Pipelines

Abstract:

For standard fracture mechanical tests flat specimens (principally CT or SENB) are required. When investigating fracture mechanical properties of thin – walled pipes this brings about a problem because it is necessary to straighten pipe bands. However, this operation causes internal stresses to be induced not only in the semi-product subjected to straightening but also in finished specimens. A question therefore arises to what extent are then the magnitudes of the fracture toughness determined representative for the actual cylindrical wall. To solve this problem fracture mechanics tests were caried out on flat (straightened) CT specimens as well as on curved CT specimens with the natural curvature. The R – curves as well as the resulting parameters of the fracture toughness, obtained for both types of CT specimens, were compared and it was concluded that the fracture toughness of the pipe material determined on straightened CT specimens was practically the same as that obtained on curved CT specimens.

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Periodical:

Applied Mechanics and Materials (Volume 821)

Pages:

464-470

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.821.464

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Online since:

January 2016

Authors:

Ľubomír Gajdoš, Martin Šperl*

Keywords:

CT Specimens, Fracture Toughness, Pipe Bands

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References

[1] Ľ. Gajdoš and M. Šperl: The Effect of Straightening of a Curved Body on Its Fracture Properties (in Czech). Proceedings of the 21st Colloquium Safety and Reliability of Gas Pipelines,. May 15-16, 2012, Prague.

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[3] Ľ. Gajdoš et al.: Safety and Reliability of High Pressure Gas Pipelines (in Czech). Czech Gas Association, Prague, (2011).

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[4] Metallic Materials - Unified Method of Test for the Determination of Quasistatic Fracture Toughness. International Standard ISO 12135, (2002).

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DOI: 10.1016/0013-7944(94)00211-y

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