Engineering Tools for Robust Creep Modeling

Dissertation

Stefan Holmström

Research output: ThesisDissertationCollection of Articles

1 Citation (Scopus)

Abstract

High temperature creep is often dealt with simplified models to assess and pre-dict the future behavior of materials and components. Also, for most applications the creep properties of interest require costly long-term testing that limits the available data to support design and life assessment. Such test data sets are even smaller for welded joints that are often the weakest links of structures. It is of considerable interest to be able to reliably predict and extrapolate long term creep behavior from relatively small sets of supporting creep data. For creep strain, the current tools for model verification and quality assurance are very limited. The ECCC PATs can be adapted to some degree but the uncer-tainty and applicability of many models are still questionable outside the range of data. In this thesis tools for improving the model robustness have been devel-oped. The toolkit includes creep rupture, weld strength and creep strain model-ing improvements for uniaxial prediction. The applicability is shown on data set consisting of a selection of common high temperature steels and the oxygen-free phosphorous doped (OFP) copper. The steels assessed are 10CrMo9-10 (P22), 7CrWVMoNb9-6 (P23), 7CrMoVTiB10-10 (P24), 14MoV6-3 (0.5CMV), X20CrMoV11-1 (X20), X10CrMoVNb9-1 (P91) and X11CrMoWVNb9-1-1 (E911).
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Aalto University
Supervisors/Advisors
  • Hänninen, Hannu, Supervisor, External person
Award date5 Feb 2010
Place of PublicationEspoo
Publisher
Print ISBNs978-951-38-7378-3
Electronic ISBNs978-951-38-7379-0
Publication statusPublished - 2010
MoE publication typeG5 Doctoral dissertation (article)

Fingerprint

Creep
Welds
Steel
Quality assurance
Copper
Temperature
Oxygen
Testing

Keywords

  • creep
  • strain
  • damage
  • modeling
  • steel
  • OFP copper

Cite this

Holmström, S. (2010). Engineering Tools for Robust Creep Modeling: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Holmström, Stefan. / Engineering Tools for Robust Creep Modeling : Dissertation. Espoo : VTT Technical Research Centre of Finland, 2010. 139 p.
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title = "Engineering Tools for Robust Creep Modeling: Dissertation",
abstract = "High temperature creep is often dealt with simplified models to assess and pre-dict the future behavior of materials and components. Also, for most applications the creep properties of interest require costly long-term testing that limits the available data to support design and life assessment. Such test data sets are even smaller for welded joints that are often the weakest links of structures. It is of considerable interest to be able to reliably predict and extrapolate long term creep behavior from relatively small sets of supporting creep data. For creep strain, the current tools for model verification and quality assurance are very limited. The ECCC PATs can be adapted to some degree but the uncer-tainty and applicability of many models are still questionable outside the range of data. In this thesis tools for improving the model robustness have been devel-oped. The toolkit includes creep rupture, weld strength and creep strain model-ing improvements for uniaxial prediction. The applicability is shown on data set consisting of a selection of common high temperature steels and the oxygen-free phosphorous doped (OFP) copper. The steels assessed are 10CrMo9-10 (P22), 7CrWVMoNb9-6 (P23), 7CrMoVTiB10-10 (P24), 14MoV6-3 (0.5CMV), X20CrMoV11-1 (X20), X10CrMoVNb9-1 (P91) and X11CrMoWVNb9-1-1 (E911).",
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author = "Stefan Holmstr{\"o}m",
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publisher = "VTT Technical Research Centre of Finland",
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}

Holmström, S 2010, 'Engineering Tools for Robust Creep Modeling: Dissertation', Doctor Degree, Aalto University, Espoo.

Engineering Tools for Robust Creep Modeling : Dissertation. / Holmström, Stefan.

Espoo : VTT Technical Research Centre of Finland, 2010. 139 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - Engineering Tools for Robust Creep Modeling

T2 - Dissertation

AU - Holmström, Stefan

N1 - Project code: 36468

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N2 - High temperature creep is often dealt with simplified models to assess and pre-dict the future behavior of materials and components. Also, for most applications the creep properties of interest require costly long-term testing that limits the available data to support design and life assessment. Such test data sets are even smaller for welded joints that are often the weakest links of structures. It is of considerable interest to be able to reliably predict and extrapolate long term creep behavior from relatively small sets of supporting creep data. For creep strain, the current tools for model verification and quality assurance are very limited. The ECCC PATs can be adapted to some degree but the uncer-tainty and applicability of many models are still questionable outside the range of data. In this thesis tools for improving the model robustness have been devel-oped. The toolkit includes creep rupture, weld strength and creep strain model-ing improvements for uniaxial prediction. The applicability is shown on data set consisting of a selection of common high temperature steels and the oxygen-free phosphorous doped (OFP) copper. The steels assessed are 10CrMo9-10 (P22), 7CrWVMoNb9-6 (P23), 7CrMoVTiB10-10 (P24), 14MoV6-3 (0.5CMV), X20CrMoV11-1 (X20), X10CrMoVNb9-1 (P91) and X11CrMoWVNb9-1-1 (E911).

AB - High temperature creep is often dealt with simplified models to assess and pre-dict the future behavior of materials and components. Also, for most applications the creep properties of interest require costly long-term testing that limits the available data to support design and life assessment. Such test data sets are even smaller for welded joints that are often the weakest links of structures. It is of considerable interest to be able to reliably predict and extrapolate long term creep behavior from relatively small sets of supporting creep data. For creep strain, the current tools for model verification and quality assurance are very limited. The ECCC PATs can be adapted to some degree but the uncer-tainty and applicability of many models are still questionable outside the range of data. In this thesis tools for improving the model robustness have been devel-oped. The toolkit includes creep rupture, weld strength and creep strain model-ing improvements for uniaxial prediction. The applicability is shown on data set consisting of a selection of common high temperature steels and the oxygen-free phosphorous doped (OFP) copper. The steels assessed are 10CrMo9-10 (P22), 7CrWVMoNb9-6 (P23), 7CrMoVTiB10-10 (P24), 14MoV6-3 (0.5CMV), X20CrMoV11-1 (X20), X10CrMoVNb9-1 (P91) and X11CrMoWVNb9-1-1 (E911).

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KW - strain

KW - damage

KW - modeling

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Holmström S. Engineering Tools for Robust Creep Modeling: Dissertation. Espoo: VTT Technical Research Centre of Finland, 2010. 139 p.