Visualising creep exhaustion in a P22 girth weld

Stefan Holmström, Anssi Laukkanen, Kim Calonius

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

4 Citations (Scopus)

Abstract

For pipings creep damage will localized to locations with degraded microstructures aggravated by triaxiality constraints. These unfavorable conditions are known to be found in the heat affected zone of welds. The influence of triaxiality in a girth weld has been studied using a new "creep exhaustion" filtering technique named ?-filtering. It has been developed for FEM analysis purposes to localize critical regions for creep exhaustion in components. The creep ductility expression for rigid plastic deformation has been used for visualizing the level of creep exhaustion in a P22 girth weld. The creep response of a 3 zone girth weld was modeled with the logistic creep strain prediction method and l-filtered in Comsol software. For comparison some calculations were performed with the Norton law implemented Abaqus software. Preliminary results of the -filtering show that the regions in the weld that are critical according to experience (interface between heat affected zone and parent material) are indeed highlighted by the filtering method.
Original languageEnglish
Title of host publicationBALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages208-221
ISBN (Electronic)978-951-38-6318-0
ISBN (Print)978-951-38-6317-3
Publication statusPublished - 2007
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 12 Jun 200714 Jun 2007

Publication series

NameVTT Symposium
PublisherVTT
Number247
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Conference

ConferenceBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period12/06/0714/06/07

Fingerprint

Creep
Welds
Heat affected zone
Ductility
Logistics
Plastic deformation
Finite element method
Microstructure

Keywords

  • ProperTune

Cite this

Holmström, S., Laukkanen, A., & Calonius, K. (2007). Visualising creep exhaustion in a P22 girth weld. In BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2 (pp. 208-221). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 247
Holmström, Stefan ; Laukkanen, Anssi ; Calonius, Kim. / Visualising creep exhaustion in a P22 girth weld. BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2007. pp. 208-221 (VTT Symposium; No. 247).
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abstract = "For pipings creep damage will localized to locations with degraded microstructures aggravated by triaxiality constraints. These unfavorable conditions are known to be found in the heat affected zone of welds. The influence of triaxiality in a girth weld has been studied using a new {"}creep exhaustion{"} filtering technique named ?-filtering. It has been developed for FEM analysis purposes to localize critical regions for creep exhaustion in components. The creep ductility expression for rigid plastic deformation has been used for visualizing the level of creep exhaustion in a P22 girth weld. The creep response of a 3 zone girth weld was modeled with the logistic creep strain prediction method and l-filtered in Comsol software. For comparison some calculations were performed with the Norton law implemented Abaqus software. Preliminary results of the -filtering show that the regions in the weld that are critical according to experience (interface between heat affected zone and parent material) are indeed highlighted by the filtering method.",
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Holmström, S, Laukkanen, A & Calonius, K 2007, Visualising creep exhaustion in a P22 girth weld. in BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 247, pp. 208-221, BALTICA VII - International Conference on Life Management and Main-tenance for Power Plants, Helsinki-Stockholm, Finland, 12/06/07.

Visualising creep exhaustion in a P22 girth weld. / Holmström, Stefan; Laukkanen, Anssi; Calonius, Kim.

BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2007. p. 208-221 (VTT Symposium; No. 247).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Visualising creep exhaustion in a P22 girth weld

AU - Holmström, Stefan

AU - Laukkanen, Anssi

AU - Calonius, Kim

PY - 2007

Y1 - 2007

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AB - For pipings creep damage will localized to locations with degraded microstructures aggravated by triaxiality constraints. These unfavorable conditions are known to be found in the heat affected zone of welds. The influence of triaxiality in a girth weld has been studied using a new "creep exhaustion" filtering technique named ?-filtering. It has been developed for FEM analysis purposes to localize critical regions for creep exhaustion in components. The creep ductility expression for rigid plastic deformation has been used for visualizing the level of creep exhaustion in a P22 girth weld. The creep response of a 3 zone girth weld was modeled with the logistic creep strain prediction method and l-filtered in Comsol software. For comparison some calculations were performed with the Norton law implemented Abaqus software. Preliminary results of the -filtering show that the regions in the weld that are critical according to experience (interface between heat affected zone and parent material) are indeed highlighted by the filtering method.

KW - ProperTune

M3 - Conference article in proceedings

SN - 978-951-38-6317-3

T3 - VTT Symposium

SP - 208

EP - 221

BT - BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Holmström S, Laukkanen A, Calonius K. Visualising creep exhaustion in a P22 girth weld. In BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. Espoo: VTT Technical Research Centre of Finland. 2007. p. 208-221. (VTT Symposium; No. 247).