Publication detail

Constraint effect on the slow crack growth in polyethylene

HUTAŘ, P. ZOUHAR, M. NEZBEDOVÁ, E. SADÍLEK, J. ŽÍDEK, J. NÁHLÍK, L. KNÉSL, Z.

Czech title

Vliv constraintu na stabilní růst trhliny v polyethylénu

English title

Constraint effect on the slow crack growth in polyethylene

Type

journal article - other

Language

en

Original abstract

From the practical point of view, most relevant damage of the HDPE structures is determined by slow crack growth. In this case plastic deformations are localized just around the crack front. Due to this fact linear elastic fracture mechanics can be used for description of the stress field around the crack tip. The constraint effect is mainly effect of the structure geometry and can be quantified by T-stress. Two different test specimens with different constraint level (T-stress) were prepared: single edge notched specimen and modified SEN specimen. The crack mouth opening displacement, crack tip opening displacement and crack length was measured. Than effect of the constraint and relation between CMOD and crack length was investigated and discussed.

Czech abstract

Z praktického pohledu dochází k nejčastějšímu porušení HDPE konstrukcí vlivem pomalého růstu trhliny. V tomto případě je před čelem malá plastická zóna a pro popis pole napětí v okolí kořene trhliny lze použít lineárně elastickou lomovou mechaniku. Vliv constraintu, který souvisí s geometrií konstrukce může být kvantifikován pomocí T-napětí. V práci jsou studovány dva typy experimentálních vzorků SEN a navržený modifikovaný SEN vzorek. Na základě měření otevření líců trhliny byl diskutován vliv contraintu jednotlivých těles. Byla také nelezena relace mezi otevřením trhliny délkou trhliny.

English abstract

From the practical point of view, most relevant damage of the HDPE structures is determined by slow crack growth. In this case plastic deformations are localized just around the crack front. Due to this fact linear elastic fracture mechanics can be used for description of the stress field around the crack tip. The constraint effect is mainly effect of the structure geometry and can be quantified by T-stress. Two different test specimens with different constraint level (T-stress) were prepared: single edge notched specimen and modified SEN specimen. The crack mouth opening displacement, crack tip opening displacement and crack length was measured. Than effect of the constraint and relation between CMOD and crack length was investigated and discussed.

Keywords in Czech

Constraint, stabilní růst trhliny, polyethylén, T-napětí

Keywords in English

Constraint, slow crack growth, polyethylene, T-stress

RIV year

2012

Released

05.06.2012

ISSN

1757-9864

Volume

3

Number

2

Pages from–to

118–126

Pages count

9

BIBTEX


@article{BUT92624,
  author="Pavel {Hutař} and Michal {Zouhar} and Eva {Nezbedová} and Jiří {Sadílek} and Jan {Žídek} and Luboš {Náhlík} and Zdeněk {Knésl},
  title="Constraint effect on the slow crack growth in polyethylene",
  year="2012",
  volume="3",
  number="2",
  month="June",
  pages="118--126",
  issn="1757-9864"
}