Fatigue testing of multiaxial non-proportionally loaded T-nodes

J. K. Kamau; M. L. Larsen; V. Arora; T. Holm-Jensen; M. Jepsen

doi:10.1201/9781003399759-51

Fatigue testing of multiaxial non-proportionally loaded T-nodes

J. K. Kamau, M. L. Larsen, V. Arora, T. Holm-Jensen, M. Jepsen

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

The finite element method (FEM) is often used in the analysis of welded tubular joints. In 2019, DNV stated that non-proportional stress states must be taken into account in the fatigue life assessment. In this paper, three fatigue experiments of T-nodes representing a chord and brace connection in a jacket structure have been performed with various phase shifts between the normal and shear stresses. The accuracy of the FE has been validated using strain measurements on the T-nodes. The FE models are developed based on the recommendations from both the IIW and DNV. The validation of the FE models shows that the strain predictions are very close to the measured strain readings indicating accurate FE modelling. Furthermore, the phase shifts between the normal and shear stresses in the experiments vary with less than 6 % from the expected phase shifts.

Original language	English
Title of host publication	Advances in the Analysis and Design of Marine Structures : Proceedings of the 9th International Conference on Marine Structures (MARSTRUCT 2023, Gothenburg, Sweden, 3-5 April 2023)
Editors	J. W. Ringsberg, C. Guedes Soares
Publisher	CRC Press
Publication date	2023
Pages	461-468
ISBN (Print)	9781032506364
ISBN (Electronic)	9781003399759
DOIs	https://doi.org/10.1201/9781003399759-51
Publication status	Published - 2023
Event	9th International Conference on Marine Structures - Gothenburg, Sweden Duration: 3. Apr 2023 → 5. Apr 2023

Conference

Conference	9th International Conference on Marine Structures
Country/Territory	Sweden
City	Gothenburg
Period	03/04/2023 → 05/04/2023

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10.1201/9781003399759-51

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Kamau, J. K., Larsen, M. L., Arora, V., Holm-Jensen, T., & Jepsen, M. (2023). Fatigue testing of multiaxial non-proportionally loaded T-nodes. In J. W. Ringsberg, & C. Guedes Soares (Eds.), Advances in the Analysis and Design of Marine Structures: Proceedings of the 9th International Conference on Marine Structures (MARSTRUCT 2023, Gothenburg, Sweden, 3-5 April 2023) (pp. 461-468). CRC Press. https://doi.org/10.1201/9781003399759-51

Kamau, J. K. ; Larsen, M. L. ; Arora, V. et al. / Fatigue testing of multiaxial non-proportionally loaded T-nodes. Advances in the Analysis and Design of Marine Structures: Proceedings of the 9th International Conference on Marine Structures (MARSTRUCT 2023, Gothenburg, Sweden, 3-5 April 2023). editor / J. W. Ringsberg ; C. Guedes Soares. CRC Press, 2023. pp. 461-468

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title = "Fatigue testing of multiaxial non-proportionally loaded T-nodes",

abstract = "The finite element method (FEM) is often used in the analysis of welded tubular joints. In 2019, DNV stated that non-proportional stress states must be taken into account in the fatigue life assessment. In this paper, three fatigue experiments of T-nodes representing a chord and brace connection in a jacket structure have been performed with various phase shifts between the normal and shear stresses. The accuracy of the FE has been validated using strain measurements on the T-nodes. The FE models are developed based on the recommendations from both the IIW and DNV. The validation of the FE models shows that the strain predictions are very close to the measured strain readings indicating accurate FE modelling. Furthermore, the phase shifts between the normal and shear stresses in the experiments vary with less than 6 % from the expected phase shifts.",

author = "Kamau, {J. K.} and Larsen, {M. L.} and V. Arora and T. Holm-Jensen and M. Jepsen",

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Kamau, JK, Larsen, ML, Arora, V, Holm-Jensen, T & Jepsen, M 2023, Fatigue testing of multiaxial non-proportionally loaded T-nodes. in JW Ringsberg & C Guedes Soares (eds), Advances in the Analysis and Design of Marine Structures: Proceedings of the 9th International Conference on Marine Structures (MARSTRUCT 2023, Gothenburg, Sweden, 3-5 April 2023). CRC Press, pp. 461-468, 9th International Conference on Marine Structures, Gothenburg, Sweden, 03/04/2023. https://doi.org/10.1201/9781003399759-51

Fatigue testing of multiaxial non-proportionally loaded T-nodes. / Kamau, J. K.; Larsen, M. L.; Arora, V. et al.
Advances in the Analysis and Design of Marine Structures: Proceedings of the 9th International Conference on Marine Structures (MARSTRUCT 2023, Gothenburg, Sweden, 3-5 April 2023). ed. / J. W. Ringsberg; C. Guedes Soares. CRC Press, 2023. p. 461-468.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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T1 - Fatigue testing of multiaxial non-proportionally loaded T-nodes

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AU - Jepsen, M.

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Y1 - 2023

N2 - The finite element method (FEM) is often used in the analysis of welded tubular joints. In 2019, DNV stated that non-proportional stress states must be taken into account in the fatigue life assessment. In this paper, three fatigue experiments of T-nodes representing a chord and brace connection in a jacket structure have been performed with various phase shifts between the normal and shear stresses. The accuracy of the FE has been validated using strain measurements on the T-nodes. The FE models are developed based on the recommendations from both the IIW and DNV. The validation of the FE models shows that the strain predictions are very close to the measured strain readings indicating accurate FE modelling. Furthermore, the phase shifts between the normal and shear stresses in the experiments vary with less than 6 % from the expected phase shifts.

AB - The finite element method (FEM) is often used in the analysis of welded tubular joints. In 2019, DNV stated that non-proportional stress states must be taken into account in the fatigue life assessment. In this paper, three fatigue experiments of T-nodes representing a chord and brace connection in a jacket structure have been performed with various phase shifts between the normal and shear stresses. The accuracy of the FE has been validated using strain measurements on the T-nodes. The FE models are developed based on the recommendations from both the IIW and DNV. The validation of the FE models shows that the strain predictions are very close to the measured strain readings indicating accurate FE modelling. Furthermore, the phase shifts between the normal and shear stresses in the experiments vary with less than 6 % from the expected phase shifts.

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Kamau JK, Larsen ML, Arora V, Holm-Jensen T, Jepsen M. Fatigue testing of multiaxial non-proportionally loaded T-nodes. In Ringsberg JW, Guedes Soares C, editors, Advances in the Analysis and Design of Marine Structures: Proceedings of the 9th International Conference on Marine Structures (MARSTRUCT 2023, Gothenburg, Sweden, 3-5 April 2023). CRC Press. 2023. p. 461-468 doi: 10.1201/9781003399759-51

Fatigue testing of multiaxial non-proportionally loaded T-nodes

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