Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel

A. Niraula; Matti Rautiainen; Ari Niemelä; Ingrit Lillemäe-Avi; H. Remes

doi:10.1201/9780429298875-49

Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel

A. Niraula, Matti Rautiainen, Ari Niemelä, Ingrit Lillemäe-Avi, H. Remes

Department of Mechanical Engineering

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

3 Citations (Scopus)

159 Downloads (Pure)

Abstract

The limited knowledge about fatigue behavior and lack of analytical solutions for distorted thin plates are predominantly limiting their application today. This paper focuses on finding the most influential distortion parameter that dictates the fatigue strength at the butt weld of a laser-hybrid welded 4 mm thin ship deck panel. A FEA based sensitivity analysis method is employed to identify the influence of the distortion parameters. The results from the experimental validation showed that the distortions of the distorted deck plate on either side of the butt weld could be simplified with 4-point and 3-point splines on longitudinal and transversal direction, respectively. The most important distortion parameters are local angular misalignment, the distortion magnitude and location of local maximum distortion close to the butt weld. The distortion parameters further away from the weld has a minor influence on the structural stress at the butt weld. Furthermore, the results showed that the local angular misalignment can independently provide a better estimate of stress magnification factor k_m compared to any other distortion parameters.

Original language	English
Title of host publication	Trends in the Analysis and Design of Marine Structures
Subtitle of host publication	Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019
Editors	C.Guedes Soares, J. Parunov
Publisher	CRC Press
Pages	423-432
Number of pages	10
ISBN (Print)	9780367278090
DOIs	https://doi.org/10.1201/9780429298875-49
Publication status	Published - 8 May 2019
MoE publication type	A4 Conference publication
Event	International Conference on Marine Structures - Dubrovnik, Croatia Duration: 6 May 2019 → 8 May 2019 Conference number: 7

Publication series

Name	Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019

Conference

Conference	International Conference on Marine Structures
Abbreviated title	MARSTRUCT
Country/Territory	Croatia
City	Dubrovnik
Period	06/05/2019 → 08/05/2019

Access to Document

10.1201/9780429298875-49

ENG_Niraula_et_al_Influence_of_weld-induced_International_Conference_on_Marine_StructuresAccepted author manuscript, 1.25 MBLicence: CC BY

Cite this

Niraula, A., Rautiainen, M., Niemelä, A., Lillemäe-Avi, I., & Remes, H. (2019). Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel. In C. G. Soares, & J. Parunov (Eds.), Trends in the Analysis and Design of Marine Structures: Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019 (pp. 423-432). (Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019). CRC Press. https://doi.org/10.1201/9780429298875-49

Niraula, A. ; Rautiainen, Matti ; Niemelä, Ari et al. / Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel. Trends in the Analysis and Design of Marine Structures: Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019. editor / C.Guedes Soares ; J. Parunov. CRC Press, 2019. pp. 423-432 (Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019).

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title = "Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel",

abstract = "The limited knowledge about fatigue behavior and lack of analytical solutions for distorted thin plates are predominantly limiting their application today. This paper focuses on finding the most influential distortion parameter that dictates the fatigue strength at the butt weld of a laser-hybrid welded 4 mm thin ship deck panel. A FEA based sensitivity analysis method is employed to identify the influence of the distortion parameters. The results from the experimental validation showed that the distortions of the distorted deck plate on either side of the butt weld could be simplified with 4-point and 3-point splines on longitudinal and transversal direction, respectively. The most important distortion parameters are local angular misalignment, the distortion magnitude and location of local maximum distortion close to the butt weld. The distortion parameters further away from the weld has a minor influence on the structural stress at the butt weld. Furthermore, the results showed that the local angular misalignment can independently provide a better estimate of stress magnification factor km compared to any other distortion parameters.",

author = "A. Niraula and Matti Rautiainen and Ari Niemel{\"a} and Ingrit Lillem{\"a}e-Avi and H. Remes",

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doi = "10.1201/9780429298875-49",

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Niraula, A, Rautiainen, M, Niemelä, A, Lillemäe-Avi, I & Remes, H 2019, Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel. in CG Soares & J Parunov (eds), Trends in the Analysis and Design of Marine Structures: Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019. Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019, CRC Press, pp. 423-432, International Conference on Marine Structures, Dubrovnik, Croatia, 06/05/2019. https://doi.org/10.1201/9780429298875-49

Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel. / Niraula, A.; Rautiainen, Matti; Niemelä, Ari et al.
Trends in the Analysis and Design of Marine Structures: Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019. ed. / C.Guedes Soares; J. Parunov. CRC Press, 2019. p. 423-432 (Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019).

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

TY - GEN

T1 - Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel

AU - Niraula, A.

AU - Rautiainen, Matti

AU - Niemelä, Ari

AU - Lillemäe-Avi, Ingrit

AU - Remes, H.

N1 - Conference code: 7

PY - 2019/5/8

Y1 - 2019/5/8

N2 - The limited knowledge about fatigue behavior and lack of analytical solutions for distorted thin plates are predominantly limiting their application today. This paper focuses on finding the most influential distortion parameter that dictates the fatigue strength at the butt weld of a laser-hybrid welded 4 mm thin ship deck panel. A FEA based sensitivity analysis method is employed to identify the influence of the distortion parameters. The results from the experimental validation showed that the distortions of the distorted deck plate on either side of the butt weld could be simplified with 4-point and 3-point splines on longitudinal and transversal direction, respectively. The most important distortion parameters are local angular misalignment, the distortion magnitude and location of local maximum distortion close to the butt weld. The distortion parameters further away from the weld has a minor influence on the structural stress at the butt weld. Furthermore, the results showed that the local angular misalignment can independently provide a better estimate of stress magnification factor km compared to any other distortion parameters.

AB - The limited knowledge about fatigue behavior and lack of analytical solutions for distorted thin plates are predominantly limiting their application today. This paper focuses on finding the most influential distortion parameter that dictates the fatigue strength at the butt weld of a laser-hybrid welded 4 mm thin ship deck panel. A FEA based sensitivity analysis method is employed to identify the influence of the distortion parameters. The results from the experimental validation showed that the distortions of the distorted deck plate on either side of the butt weld could be simplified with 4-point and 3-point splines on longitudinal and transversal direction, respectively. The most important distortion parameters are local angular misalignment, the distortion magnitude and location of local maximum distortion close to the butt weld. The distortion parameters further away from the weld has a minor influence on the structural stress at the butt weld. Furthermore, the results showed that the local angular misalignment can independently provide a better estimate of stress magnification factor km compared to any other distortion parameters.

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M3 - Conference article in proceedings

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SN - 9780367278090

T3 - Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019

SP - 423

EP - 432

BT - Trends in the Analysis and Design of Marine Structures

A2 - Soares, C.Guedes

A2 - Parunov, J.

PB - CRC Press

T2 - International Conference on Marine Structures

Y2 - 6 May 2019 through 8 May 2019

ER -

Niraula A, Rautiainen M, Niemelä A, Lillemäe-Avi I, Remes H. Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel. In Soares CG, Parunov J, editors, Trends in the Analysis and Design of Marine Structures: Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019. CRC Press. 2019. p. 423-432. (Trends in the Analysis and Design of Marine Structures - Proceedings of the 7th International Conference on Marine Structures, MARSTRUCT 2019). doi: 10.1201/9780429298875-49

Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel

Abstract

Publication series

Conference

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i3 – Industry Innovation Infrastructure

Solid Mechanics Laboratory (i3)

MARSTRUCT 2019

Cite this

Influence of weld-induced distortions on the stress magnification factor of a thin laser-hybrid welded ship deck panel

Abstract

Publication series

Conference

Access to Document

Other files and links

Fingerprint

Equipment

i3 – Industry Innovation Infrastructure

Solid Mechanics Laboratory (i3)

Activities

MARSTRUCT 2019

Cite this