Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading
S.667-674 : Abb.,Tab.,Lit. In a joint project of a German working group supported by the ECSC large scale tubular joints welded from fine grained steels StE 355 and StE 690 and hybrid tubulars with cast steel inserts from GS-8 Mn 7 welded in StE 355 were tested under variable amplitude loading in ar...
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ftfrauneprints:oai:publica.fraunhofer.de:publica/320814 2023-05-15T14:20:50+02:00 Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading Korrosionsschwingfestigkeit von geschweißten und Stahl-Stahlguß-Verbund-Rohrknoten unter Belastungen mit konstanten und veränderlichen Amplituden Sonsino, C.M. Umbach, R. 1993 https://publica.fraunhofer.de/handle/publica/320814 en eng International Conference on Offshore Mechanics and Arctic Engineering 1993 OMAE '93. 12th International Conference on Offshore Mechanics and Arctic Engineering. Vol.III. Part B Materials Engineering https://publica.fraunhofer.de/handle/publica/320814 constant amplitude loading corrosion fatigue strength Einstufenbeanspruchung Korrosionsschwingfestigkeit Mehrstufenbeanspruchung Offshore-Konstruktion offshore structure Rohrknoten Schweißverbindung Stahlguß steel casting tubular joint variable amplitude loading welded joint 620 conference paper 1993 ftfrauneprints 2022-11-01T19:47:37Z S.667-674 : Abb.,Tab.,Lit. In a joint project of a German working group supported by the ECSC large scale tubular joints welded from fine grained steels StE 355 and StE 690 and hybrid tubulars with cast steel inserts from GS-8 Mn 7 welded in StE 355 were tested under variable amplitude loading in artificial seawater. One of the welded StE 355 nodes was tested in air, several under cathodic protection. The welded nodes from the high-strength steel underwent post-weld treatments like shot peening, profile reinforcement, and TIG-dressing. The results were evaluated for the failure criteria fatigue life to crack initiation (A is equal 1mm) and through crack. For the welded nodes from StE 355 fracture mechanical models were applied with satisfactory results. Profile reinforcement with combinded TIG-dressing gave a significantly better fatigue life compared to nodes in as-welded state. However, with hybrid tubulars, where by the use of cast steel inserts the welds were removed into areas of lower stress concentration fatigue lives higher than a factor of 100 were achieved compared to the welded nodes. The results of this investigation do not only show how to improve the fatigue life by a new design using cast steel inserts but indicate also how to revise design codes from the point of damage calculation (damage sum of 0,50 for welded nodes and 0.25 for cast steel inserts instead of the conventional value of 1.00) as well as consideration of fatigue life to initiation of a technically detectable crack with a defined depth, e.g. a is equal 1 mm. Conference Object Arctic Publikationsdatenbank der Fraunhofer-Gesellschaft |
institution |
Open Polar |
collection |
Publikationsdatenbank der Fraunhofer-Gesellschaft |
op_collection_id |
ftfrauneprints |
language |
English |
topic |
constant amplitude loading corrosion fatigue strength Einstufenbeanspruchung Korrosionsschwingfestigkeit Mehrstufenbeanspruchung Offshore-Konstruktion offshore structure Rohrknoten Schweißverbindung Stahlguß steel casting tubular joint variable amplitude loading welded joint 620 |
spellingShingle |
constant amplitude loading corrosion fatigue strength Einstufenbeanspruchung Korrosionsschwingfestigkeit Mehrstufenbeanspruchung Offshore-Konstruktion offshore structure Rohrknoten Schweißverbindung Stahlguß steel casting tubular joint variable amplitude loading welded joint 620 Sonsino, C.M. Umbach, R. Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
topic_facet |
constant amplitude loading corrosion fatigue strength Einstufenbeanspruchung Korrosionsschwingfestigkeit Mehrstufenbeanspruchung Offshore-Konstruktion offshore structure Rohrknoten Schweißverbindung Stahlguß steel casting tubular joint variable amplitude loading welded joint 620 |
description |
S.667-674 : Abb.,Tab.,Lit. In a joint project of a German working group supported by the ECSC large scale tubular joints welded from fine grained steels StE 355 and StE 690 and hybrid tubulars with cast steel inserts from GS-8 Mn 7 welded in StE 355 were tested under variable amplitude loading in artificial seawater. One of the welded StE 355 nodes was tested in air, several under cathodic protection. The welded nodes from the high-strength steel underwent post-weld treatments like shot peening, profile reinforcement, and TIG-dressing. The results were evaluated for the failure criteria fatigue life to crack initiation (A is equal 1mm) and through crack. For the welded nodes from StE 355 fracture mechanical models were applied with satisfactory results. Profile reinforcement with combinded TIG-dressing gave a significantly better fatigue life compared to nodes in as-welded state. However, with hybrid tubulars, where by the use of cast steel inserts the welds were removed into areas of lower stress concentration fatigue lives higher than a factor of 100 were achieved compared to the welded nodes. The results of this investigation do not only show how to improve the fatigue life by a new design using cast steel inserts but indicate also how to revise design codes from the point of damage calculation (damage sum of 0,50 for welded nodes and 0.25 for cast steel inserts instead of the conventional value of 1.00) as well as consideration of fatigue life to initiation of a technically detectable crack with a defined depth, e.g. a is equal 1 mm. |
format |
Conference Object |
author |
Sonsino, C.M. Umbach, R. |
author_facet |
Sonsino, C.M. Umbach, R. |
author_sort |
Sonsino, C.M. |
title |
Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
title_short |
Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
title_full |
Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
title_fullStr |
Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
title_full_unstemmed |
Corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
title_sort |
corrosion fatigue of welded and cast-steel hybrid nodes under constant and variable amplitude loading |
publishDate |
1993 |
url |
https://publica.fraunhofer.de/handle/publica/320814 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
International Conference on Offshore Mechanics and Arctic Engineering 1993 OMAE '93. 12th International Conference on Offshore Mechanics and Arctic Engineering. Vol.III. Part B Materials Engineering https://publica.fraunhofer.de/handle/publica/320814 |
_version_ |
1766293323815845888 |