Publication detail

Special fracture mechanics specimens for multilayer plastic pipes testing

HUTAŘ, P. ŠESTÁKOVÁ, L. KNÉSL, Z. NEZBEDOVÁ, E. NÁHLÍK, L.

Czech title

Speciální zkušební těleso pro měření lomově-mechanických parametrů vícevrstvých polymerních trubek

English title

Special fracture mechanics specimens for multilayer plastic pipes testing

Type

journal article - other

Language

en

Original abstract

Pipes consisting of layers of different materials (multilayer pipes) are considered. The fracture toughness value of the main pipe is taken into account as a parameter relevant to fracture assessment connected with the resistance of pipe material against slow crack growth. With the aim of simplifying estimation of main pipe material fracture toughness, non-homogeneous test specimens cut directly from multi-layer pipes are suggested and numerically analysed. The values of the corresponding stress intensity factor KI and biaxiality factors B are calculated for the case of two and three layer test specimens. Based on the results obtained, the transferability of fracture toughness values measured on laboratory specimens to pipe systems is discussed. It is shown that in most cases of multilayer commercial pipes and routine fracture toughness measurements the values of the stress intensity factor calculated on the basis of homogeneous specimens can be used.

Czech abstract

Práce se zabývá návrhem speciálního zkušebního tělesa pro měření lomově-mechanických parametrů vícevrstvých polymerních trubek. V práci jsou navrženy 2 typy těles vhodných pro testování 3 bodovým ohybem a tahem.

English abstract

Pipes consisting of layers of different materials (multilayer pipes) are considered. The fracture toughness value of the main pipe is taken into account as a parameter relevant to fracture assessment connected with the resistance of pipe material against slow crack growth. With the aim of simplifying estimation of main pipe material fracture toughness, non-homogeneous test specimens cut directly from multi-layer pipes are suggested and numerically analysed. The values of the corresponding stress intensity factor KI and biaxiality factors B are calculated for the case of two and three layer test specimens. Based on the results obtained, the transferability of fracture toughness values measured on laboratory specimens to pipe systems is discussed. It is shown that in most cases of multilayer commercial pipes and routine fracture toughness measurements the values of the stress intensity factor calculated on the basis of homogeneous specimens can be used.

Keywords in English

Multilayer plastic pipes, C-type specimen, K-calibration, Fracture toughness, Slow crack growth, Non-homogenous specimens

RIV year

2009

Released

07.07.2009

Publisher

Elsevier

Location

Amsterdam, Nizozemí

ISSN

0142-9418

Journal

POLYMER TESTING

Volume

28

Number

8

Pages from–to

785–792

Pages count

7

BIBTEX


@article{BUT49307,
  author="Pavel {Hutař} and Lucie {Malíková} and Zdeněk {Knésl} and Eva {Nezbedová} and Luboš {Náhlík},
  title="Special fracture mechanics specimens for multilayer plastic pipes testing",
  journal="POLYMER TESTING",
  year="2009",
  volume="28",
  number="8",
  month="July",
  pages="785--792",
  publisher="Elsevier",
  address="Amsterdam, Nizozemí",
  issn="0142-9418"
}