Original title:
Pressure pipe damage: Numerical estimation of point load effect
Authors:
Zouhar, Michal ; Hutař, Pavel ; Ševčík, Martin ; Náhlík, Luboš Document type: Papers Conference/Event: FDM 2012 - International Conference on Fracture and Damage Mechanics /11./, Xian (CN), 2012-09-12 / 2012-09-18
Year:
2013
Language:
eng Series:
Key Engineering Materials Abstract:
The most relevant loading conditions for real polymer pipe systems are not only internal pressure, but also loading caused by sand embedding including bending or different kinds of point loads. It has been shown that service lifetime of buried pipes can be reduced especially due to stress concentration caused by external point loads. If the pipe is loaded locally the stress is concentrated here and a crack can initiate at this position or the existing crack can be affected by corresponding stress redistribution. In the paper the effect of the hard indenter, Poisson's ratio, hoop stress level and pipe wall thickness on the crack shape was estimated using numerical simulations of the creep crack propagation based on finite element method. Relation between crack length and crack width was found and expressed by simple relationship. A deeper understanding of the point load effect in order to prevent unexpected failure of the pipelines is of paramount importance for pipeline design.
Keywords:
crack shape prediction; failure; point load; polymer pressure pipes; slow crack-growth; stress intensity factor Project no.: GAP108/12/1560 (CEP), GD106/09/H035 (CEP) Funding provider: GA ČR, GA ČR Host item entry: Advances in Fracture and Damage Mechanics XI, ISBN 978-3-03785-463-1, ISSN 1013-9826
Institution: Institute of Physics of Materials AS ČR
(web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0280151