Creep damage, ductility and expected life for materials with defects

Pertti Auerkari, Stefan Holmström, Juhani Rantala, Jorma Salonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

Defects can pre-exist and grow by creep in structures subjected to loading at high temperatures. As structural integrity is not necessarily conveniently predicted and managed by applying design and life assessment techniques intended for nominally defect-free material, it is important that methods are available for quantified and safe assessment of defects. In addition to the assessment methods, also materials behaviour will affect the likely outcome. In particular, ductility of the materials is important, and unfortunately ductility tends to decrease when shifting from short-term testing to long term creep conditions. In this paper, two examples are shown of materials with such ductility effects when combined with defects. The first example involves 316H stainless steel subjected to creep loading with an extensive crack-like defect, resulting in a transformation from microscopically ductile to brittle intergranular cracking within a relatively modest time span. The second example will demonstrate a corresponding shift in OFP copper that shows a radical ductility and life reduction in creep when including so small weld defects that they would be undetectable in conventional NDT.
Original languageEnglish
Title of host publicationProceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008
Place of PublicationNew York, NY
PublisherAmerican Society of Mechanical Engineers ASME
Pages605-610
Volume1
ISBN (Print)9780791848241
DOIs
Publication statusPublished - 2008
MoE publication typeA4 Article in a conference publication
EventASME Pressure Vessels and Piping Conference, PVP 2008 - Chicago, Illinois, United States
Duration: 27 Jul 200831 Jul 2008

Conference

ConferenceASME Pressure Vessels and Piping Conference, PVP 2008
Abbreviated titlePVP 2008
CountryUnited States
CityChicago, Illinois
Period27/07/0831/07/08

Fingerprint

Ductility
Creep
Defects
Structural integrity
Nondestructive examination
Welds
Stainless steel
Cracks
Copper
Testing
Temperature

Cite this

Auerkari, P., Holmström, S., Rantala, J., & Salonen, J. (2008). Creep damage, ductility and expected life for materials with defects. In Proceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008 (Vol. 1, pp. 605-610). New York, NY: American Society of Mechanical Engineers ASME. https://doi.org/10.1115/PVP2008-61428
Auerkari, Pertti ; Holmström, Stefan ; Rantala, Juhani ; Salonen, Jorma. / Creep damage, ductility and expected life for materials with defects. Proceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008. Vol. 1 New York, NY : American Society of Mechanical Engineers ASME, 2008. pp. 605-610
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Auerkari, P, Holmström, S, Rantala, J & Salonen, J 2008, Creep damage, ductility and expected life for materials with defects. in Proceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008. vol. 1, American Society of Mechanical Engineers ASME, New York, NY, pp. 605-610, ASME Pressure Vessels and Piping Conference, PVP 2008, Chicago, Illinois, United States, 27/07/08. https://doi.org/10.1115/PVP2008-61428

Creep damage, ductility and expected life for materials with defects. / Auerkari, Pertti; Holmström, Stefan; Rantala, Juhani; Salonen, Jorma.

Proceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008. Vol. 1 New York, NY : American Society of Mechanical Engineers ASME, 2008. p. 605-610.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AB - Defects can pre-exist and grow by creep in structures subjected to loading at high temperatures. As structural integrity is not necessarily conveniently predicted and managed by applying design and life assessment techniques intended for nominally defect-free material, it is important that methods are available for quantified and safe assessment of defects. In addition to the assessment methods, also materials behaviour will affect the likely outcome. In particular, ductility of the materials is important, and unfortunately ductility tends to decrease when shifting from short-term testing to long term creep conditions. In this paper, two examples are shown of materials with such ductility effects when combined with defects. The first example involves 316H stainless steel subjected to creep loading with an extensive crack-like defect, resulting in a transformation from microscopically ductile to brittle intergranular cracking within a relatively modest time span. The second example will demonstrate a corresponding shift in OFP copper that shows a radical ductility and life reduction in creep when including so small weld defects that they would be undetectable in conventional NDT.

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Auerkari P, Holmström S, Rantala J, Salonen J. Creep damage, ductility and expected life for materials with defects. In Proceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008. Vol. 1. New York, NY: American Society of Mechanical Engineers ASME. 2008. p. 605-610 https://doi.org/10.1115/PVP2008-61428