Modeling and verification of creep strain and exhaustion in a welded steam mixer

Stefan Holmström (Corresponding Author), Juhani Rantala, Anssi Laukkanen, Kari Kolari, Heikki Keinänen, Olli Lehtinen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”
Original languageEnglish
Article number061405
Number of pages6
JournalJournal of Pressure Vessel Technology
Volume131
Issue number6
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Creep
Steam
ABAQUS
Logistics
Strain rate
Nozzles
Plastic deformation
Materials properties
Welds
Finite element method
Microstructure
Steel

Keywords

  • ProperTune

Cite this

@article{fec0619155b84f018d20b0e16b8a91c9,
title = "Modeling and verification of creep strain and exhaustion in a welded steam mixer",
abstract = "Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”",
keywords = "ProperTune",
author = "Stefan Holmstr{\"o}m and Juhani Rantala and Anssi Laukkanen and Kari Kolari and Heikki Kein{\"a}nen and Olli Lehtinen",
year = "2009",
doi = "10.1115/1.4000201",
language = "English",
volume = "131",
journal = "Journal of Pressure Vessel Technology",
issn = "0094-9930",
publisher = "American Society of Mechanical Engineers ASME",
number = "6",

}

Modeling and verification of creep strain and exhaustion in a welded steam mixer. / Holmström, Stefan (Corresponding Author); Rantala, Juhani; Laukkanen, Anssi; Kolari, Kari; Keinänen, Heikki; Lehtinen, Olli.

In: Journal of Pressure Vessel Technology, Vol. 131, No. 6, 061405, 2009.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modeling and verification of creep strain and exhaustion in a welded steam mixer

AU - Holmström, Stefan

AU - Rantala, Juhani

AU - Laukkanen, Anssi

AU - Kolari, Kari

AU - Keinänen, Heikki

AU - Lehtinen, Olli

PY - 2009

Y1 - 2009

N2 - Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”

AB - Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”

KW - ProperTune

U2 - 10.1115/1.4000201

DO - 10.1115/1.4000201

M3 - Article

VL - 131

JO - Journal of Pressure Vessel Technology

JF - Journal of Pressure Vessel Technology

SN - 0094-9930

IS - 6

M1 - 061405

ER -