Publication detail
The effect of polymer pipe weld geometry on creep lifetime
ŠEVČÍK, M. HUTAŘ, P. NÁHLÍK, L. KNÉSL, Z.
Czech title
Vliv geometrie svaru na creepové porušení svařovaných polymerních trubek
English title
The effect of polymer pipe weld geometry on creep lifetime
Type
journal article - other
Language
en
Original abstract
In the case of large diameter HDPE and polypropylene (PP) pipes the most usual joint is butt weld. Usually, a good quality of a butt welded joint means that strength of the joint should be about the same as valid for the basic pipe material. In reality geometry, morphology and material structure of welded joints on micro- and macro-level are more complicated in comparison with the base homogeneous pipe material. The formation of weld structure is highly dependent on both thermal history and corresponding stress state. The geometry of the weld and change of the material properties inside the weld can change failure resistance of the pipe system. The primary objective of this work is to estimate the influence of weld deposit geometry on the failure assessment of the welded polymer pipes under creep loading. To this aim an overlay of the material near the weld is modeled as a notch and corresponding stress distribution and its triaxiality is analyzed. The calculations are performed for real geometry of the butt weld and can help estimate lifetime of the structures considered.
Czech abstract
V práci je numericky odhadnut vliv tvaru svaru na životnost svařované trubky vystavené creepovému zatížení.
English abstract
In the case of large diameter HDPE and polypropylene (PP) pipes the most usual joint is butt weld. Usually, a good quality of a butt welded joint means that strength of the joint should be about the same as valid for the basic pipe material. In reality geometry, morphology and material structure of welded joints on micro- and macro-level are more complicated in comparison with the base homogeneous pipe material. The formation of weld structure is highly dependent on both thermal history and corresponding stress state. The geometry of the weld and change of the material properties inside the weld can change failure resistance of the pipe system. The primary objective of this work is to estimate the influence of weld deposit geometry on the failure assessment of the welded polymer pipes under creep loading. To this aim an overlay of the material near the weld is modeled as a notch and corresponding stress distribution and its triaxiality is analyzed. The calculations are performed for real geometry of the butt weld and can help estimate lifetime of the structures considered.
Keywords in Czech
creep, součinitel koncentrace napětí, životnost, triaxialita,
Keywords in English
creep, stress concentration factor, lifetime, triaxiality
RIV year
2011
Released
05.01.2011
Publisher
Trans Tech Publications
Location
Switzerland
ISSN
1013-9826
Journal
Key Engineering Materials
Volume
465
Number
-
Pages from–to
175–178
Pages count
4
BIBTEX
@article{BUT50878,
author="Martin {Ševčík} and Pavel {Hutař} and Luboš {Náhlík} and Zdeněk {Knésl},
title="The effect of polymer pipe weld geometry on creep lifetime",
journal="Key Engineering Materials",
year="2011",
volume="465",
number="-",
month="January",
pages="175--178",
publisher="Trans Tech Publications",
address="Switzerland",
issn="1013-9826"
}