Publication detail
Crack growth modeling in a specimen with polymer weld
ŠEVČÍK, M. HUTAŘ, P. NÁHLÍK, L. LACH, R. KNÉSL, Z. GRELLMANN, W.
Czech title
Simulace šíření trhliny ve svarech polymerních materiálů
English title
Crack growth modeling in a specimen with polymer weld
Type
journal article - other
Language
en
Original abstract
Secure and cost effective joining methods are key points for practical applications of plastic pipelines. The morphology and material structure of welded joints are complicated in comparison with the base pipe material. The formation of the weld is highly dependent on both thermal history and stress state. Consequently, the material parameters characterizing the weld joint and corresponding heated zone influence the reliability and safety of the welded pipe system as a whole. In the contribution a welded polymer-polymer butt joint is considered and its possible damage caused by slow crack growing in the weld zone is numerically analyzed. The numerical model takes into account the geometry of the bead and changes in material properties inside the weld zone. The results obtained from welded specimens are compared with those for a smooth specimen from the base material. The conclusions described in the paper can be used for a better transfer of fracture mechanics characteristics between laboratory specimens and real pipes.
Czech abstract
V práci je provedena lomově-mechanická studie porušování svarů polymerních potrubí. V důsledku technologických podmínek svařování dojde v místě svarového spoje k vytvoření materiálové nehomogenity. Cílem práce je stanovení vlivu materiálové nehomogenity na trajektorii trhliny. Dále je v práci studován vliv geometrie svarového výronu na chování trhliny. Ukázalo se, že vliv geometrie svarového výronu na chování trhliny je poměrně malý.
English abstract
Secure and cost effective joining methods are key points for practical applications of plastic pipelines. The morphology and material structure of welded joints are complicated in comparison with the base pipe material. The formation of the weld is highly dependent on both thermal history and stress state. Consequently, the material parameters characterizing the weld joint and corresponding heated zone influence the reliability and safety of the welded pipe system as a whole. In the contribution a welded polymer-polymer butt joint is considered and its possible damage caused by slow crack growing in the weld zone is numerically analyzed. The numerical model takes into account the geometry of the bead and changes in material properties inside the weld zone. The results obtained from welded specimens are compared with those for a smooth specimen from the base material. The conclusions described in the paper can be used for a better transfer of fracture mechanics characteristics between laboratory specimens and real pipes.
Keywords in Czech
polymerní svar; šíření trhliny; gradientní materiál; lomová mechanika
Keywords in English
polymer weld; crack propagation; graded structure; fracture mechanics
RIV year
2012
Released
02.01.2012
Publisher
Trans Tech Publications
Location
Switzerland
ISSN
1013-9826
Volume
488-489
Number
-
Pages from–to
158–161
Pages count
4
BIBTEX
@article{BUT74940,
author="Martin {Ševčík} and Pavel {Hutař} and Luboš {Náhlík} and Ralf {Lach} and Zdeněk {Knésl} and Wolfgang {Grellmann},
title="Crack growth modeling in a specimen with polymer weld",
year="2012",
volume="488-489",
number="-",
month="January",
pages="158--161",
publisher="Trans Tech Publications",
address="Switzerland",
issn="1013-9826"
}