Publication detail

Point load effect on the buried polyolefin pipes lifetime

MAJER, Z. HUTAŘ, P. FRANK, A. ŠEVČÍK, M. ZOUHAR, M. PINTER, G. NÁHLÍK, L.

Original Title

Point load effect on the buried polyolefin pipes lifetime

Type

journal article in Web of Science

Language

English

Original Abstract

Polymer pipe lifetime is conventionally estimated by internal pressure test. However, important for service are also other types of loading as: additional bending, different type of external loading from sand embedding, or effect of the residual stresses. One of the dangerous type of loading is so-called “point load” caused, for example, by stones in the soil. The present article is focused on the numerical prediction of this effect on the pipe lifetime. For the lifetime estimation of a polymer pipe under point loading, an approach based on combination of numerical calculation and experimental measurements was used. A special numerical algorithm, which optimizes modeled crack front shape according to the real one during simulation of crack propagation, was proposed. Finally, an analytical relationship for the estimation of fracture parameters of propagating crack across the pipe wall crucial for the pipe lifetime estimation is presented in the paper. A significant reduction of the residual lifetime was found for the cracked pipe loaded by additional point load (consideration of indentation effects of stones in the soil) in comparison with pipe loaded by internal pressure only. The approach presented contributes to the safer service of polyolefin pipes.

Keywords

lifetime estimation, residual stresses, polyolefin pipe, FEM, crack propagation

Authors

MAJER, Z.; HUTAŘ, P.; FRANK, A.; ŠEVČÍK, M.; ZOUHAR, M.; PINTER, G.; NÁHLÍK, L.

Released

11. 1. 2016

Publisher

WILEY-BLACKWELL, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA

ISBN

1548-2634

Periodical

Polymer Engineering & Science

Year of study

56

Number

1

State

United States of America

Pages from

79

Pages to

86

Pages count

7

URL

http://onlinelibrary.wiley.com/doi/10.1002/pen.24194/abstract

BibTex

@article{BUT121963,
  author="Zdeněk {Majer} and Pavel {Hutař} and Andreas {Frank} and Martin {Ševčík} and Michal {Zouhar} and Gerald {Pinter} and Luboš {Náhlík}",
  title="Point load effect on the buried polyolefin pipes lifetime",
  journal="Polymer Engineering & Science",
  year="2016",
  volume="56",
  number="1",
  pages="79--86",
  doi="10.1002/pen.24194",
  issn="1548-2634",
  url="http://onlinelibrary.wiley.com/doi/10.1002/pen.24194/abstract"
}