Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints
Welding is a commonly applied joining method in many applications in arctic and marine conditions, e.g., in ship and offshore structures, and energy production equipment. Such applications are usually subjected to fluctuating load conditions, and during a decades-long service, they may experience mi...
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fttsvojs:oai:journal.fi:article/124670 2023-06-11T04:09:22+02:00 Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints Ahola, Antti Santeri Björk, Timo 2023-05-02 application/pdf https://rakenteidenmekaniikka.journal.fi/article/view/124670 https://doi.org/10.23998/rm.124670 eng eng Rakenteiden Mekaniikan Seura ry https://rakenteidenmekaniikka.journal.fi/article/view/124670/78263 https://rakenteidenmekaniikka.journal.fi/article/view/124670 doi:10.23998/rm.124670 Copyright (c) 2023 Antti Ahola, Timo Björk https://creativecommons.org/licenses/by/4.0 Rakenteiden Mekaniikka; Vol 56 Nro 1 (2023); 41-50 Rakenteiden mekaniikka; Vol 56 Nr 1 (2023); 41-50 Journal of Structural Mechanics; Vol. 56 No. 1 (2023); 41-50 1797-5301 0783-6104 welded joint fatigue stress intensity factor linear elastic fracture mechanics effective notch stress info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 fttsvojs https://doi.org/10.23998/rm.124670 2023-05-03T23:00:20Z Welding is a commonly applied joining method in many applications in arctic and marine conditions, e.g., in ship and offshore structures, and energy production equipment. Such applications are usually subjected to fluctuating load conditions, and during a decades-long service, they may experience millions of load cycles. Consequently, fatigue strength design and acceptable flaw sizes in the welded details of these structures are among the most important design criteria. Multiple fatigue strength assessment approaches exist for assessing the fatigue strength of a welded detail. The present study introduces a numerical and analytical fatigue strength assessment, conducted on a non-load-carrying X-joint, which is a representative joint type used in many steel constructions. Fatigue analyses are carried out following the DNVGL-RP-C203 and BS7910:2013 fatigue design guidelines for offshore steel structures. The stress intensity factors (SIFs) for linear elastic fracture mechanics (LEFM) analyses were obtained using three different methods: the weight function approach, the analytical equations provided in the IIW Recommendations, and by conducting numerical crack propagation analysis using the Franc2D software. All three methods had a good agreement particularly for short crack depths, indicating the applicability of the analytical approaches for the fatigue analyses. The results showed that the consideration of degree of bending at the welded detail is crucial due to the distinguishing notch stress factors of membrane and bending loading, and different stress distributions in the through-thickness direction. In addition, it was found that the LEFM-based fatigue life assessments are significantly more conservative than the life predictions obtained using the structural hot-spot and effective notch stress approaches. Welding is a commonly applied joining method in many applications in arctic and marine conditions, e.g., in ship and offshore structures, and energy production equipment. Such applications are usually ... Article in Journal/Newspaper Arctic Federation of Finnish Learned Societies: Scientific Journals Online Arctic Rakenteiden Mekaniikka 56 1 41 50 |
institution |
Open Polar |
collection |
Federation of Finnish Learned Societies: Scientific Journals Online |
op_collection_id |
fttsvojs |
language |
English |
topic |
welded joint fatigue stress intensity factor linear elastic fracture mechanics effective notch stress |
spellingShingle |
welded joint fatigue stress intensity factor linear elastic fracture mechanics effective notch stress Ahola, Antti Santeri Björk, Timo Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
topic_facet |
welded joint fatigue stress intensity factor linear elastic fracture mechanics effective notch stress |
description |
Welding is a commonly applied joining method in many applications in arctic and marine conditions, e.g., in ship and offshore structures, and energy production equipment. Such applications are usually subjected to fluctuating load conditions, and during a decades-long service, they may experience millions of load cycles. Consequently, fatigue strength design and acceptable flaw sizes in the welded details of these structures are among the most important design criteria. Multiple fatigue strength assessment approaches exist for assessing the fatigue strength of a welded detail. The present study introduces a numerical and analytical fatigue strength assessment, conducted on a non-load-carrying X-joint, which is a representative joint type used in many steel constructions. Fatigue analyses are carried out following the DNVGL-RP-C203 and BS7910:2013 fatigue design guidelines for offshore steel structures. The stress intensity factors (SIFs) for linear elastic fracture mechanics (LEFM) analyses were obtained using three different methods: the weight function approach, the analytical equations provided in the IIW Recommendations, and by conducting numerical crack propagation analysis using the Franc2D software. All three methods had a good agreement particularly for short crack depths, indicating the applicability of the analytical approaches for the fatigue analyses. The results showed that the consideration of degree of bending at the welded detail is crucial due to the distinguishing notch stress factors of membrane and bending loading, and different stress distributions in the through-thickness direction. In addition, it was found that the LEFM-based fatigue life assessments are significantly more conservative than the life predictions obtained using the structural hot-spot and effective notch stress approaches. Welding is a commonly applied joining method in many applications in arctic and marine conditions, e.g., in ship and offshore structures, and energy production equipment. Such applications are usually ... |
format |
Article in Journal/Newspaper |
author |
Ahola, Antti Santeri Björk, Timo |
author_facet |
Ahola, Antti Santeri Björk, Timo |
author_sort |
Ahola, Antti Santeri |
title |
Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
title_short |
Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
title_full |
Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
title_fullStr |
Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
title_full_unstemmed |
Fatigue strength assessment of welded joints in the marine environment : A case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
title_sort |
fatigue strength assessment of welded joints in the marine environment : a case study on the applications of local stress and fracture mechanics methods for analyzing non-load-carrying fillet-welded joints |
publisher |
Rakenteiden Mekaniikan Seura ry |
publishDate |
2023 |
url |
https://rakenteidenmekaniikka.journal.fi/article/view/124670 https://doi.org/10.23998/rm.124670 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Rakenteiden Mekaniikka; Vol 56 Nro 1 (2023); 41-50 Rakenteiden mekaniikka; Vol 56 Nr 1 (2023); 41-50 Journal of Structural Mechanics; Vol. 56 No. 1 (2023); 41-50 1797-5301 0783-6104 |
op_relation |
https://rakenteidenmekaniikka.journal.fi/article/view/124670/78263 https://rakenteidenmekaniikka.journal.fi/article/view/124670 doi:10.23998/rm.124670 |
op_rights |
Copyright (c) 2023 Antti Ahola, Timo Björk https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.23998/rm.124670 |
container_title |
Rakenteiden Mekaniikka |
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56 |
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1 |
container_start_page |
41 |
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50 |
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1768383175453573120 |