Research Papers: Structures and Safety Reliability

Nonlinear Computational Welding Mechanics for Large Structures

[+] Author and Article Information
Kazuki Ikushima

Graduate School of Engineering,
Osaka Prefecture University,
1-1, Gakuencho, Nakaku,
Sakai 599-8531, Osaka, Japan
e-mail: ikushima@marine.osakafu-u.ac.jp

Masakazu Shibahara

Graduate School of Engineering,
Osaka Prefecture University,
1-1, Gakuencho, Nakaku,
Sakai 599-8531, Osaka, Japan
e-mail: shibahara@marine.osakafu-u.ac.jp

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 19, 2018; final manuscript received September 2, 2018; published online October 12, 2018. Assoc. Editor: Yordan Garbatov.

J. Offshore Mech. Arct. Eng 141(2), 021603 (Oct 12, 2018) (10 pages) Paper No: OMAE-18-1044; doi: 10.1115/1.4041395 History: Received April 19, 2018; Revised September 02, 2018

In the construction of thin plate steel structures, including ships, welding is widely used to join parts. Welding inevitably causes deformation in thin plate structures, which may cause various problems. In the present study, an analysis method is developed to realize the prediction of deformation during the construction of large-scale structures based on the thermal elastic plastic analysis method. The developed method uses the idealized explicit finite element method (IEFEM), which is a high-speed thermal elastic plastic analysis method, and an algebraic multigrid method (AMG) is also introduced to the IEFEM in order to realize an efficient analysis of large-scale thin plate structures. In order to investigate the analysis accuracy and the performance of the developed method, the developed method is applied to the analysis of deformation on the welding of a simple stiffened structure. The developed method is then applied to the prediction of welding deformation in the construction of a ship block. The obtained results indicate that the developed method has approximately the same analysis accuracy as the conventional method, and the computational speed of the developed method is dramatically faster than that of the conventional method. The developed method can analyze the welding deformation in the construction of the ship block structure which consists of more than 10 million degrees-of-freedom and is difficult to solve by the conventional method.

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Fig. 1

Typical two-dimensional aggregates

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Fig. 2

Flow of the multigrid method introduced in the IEFEM

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Fig. 3

Schematic diagram of the multigrid method introduced in the IEFEM

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Fig. 4

Analysis model and mesh

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Fig. 5

Material properties of SM490

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Fig. 6

Distribution of displacement in the z direction: (a) MGIEFEM and (b) SIFEM

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Fig. 7

Longitudinal distributions of displacements in the z direction

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Fig. 8

Transverse distributions of displacements in the z direction

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Fig. 9

Distributions of longitudinal shrinkage

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Fig. 10

Distributions of transverse shrinkage

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Fig. 11

Distributions of residual stress in the longitudinal and transverse directions on the back face under the welding line

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Fig. 12

Analysis model and assembly sequence of the double bottom block of the ship hull block

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Fig. 13

Example of mesh divisions: (a) mesh division near the stiffener (part A in Fig. 12) and (b) mesh division near the transverse girder and the stiffener

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Fig. 14

Distribution of temperature during welding of subassembly 1

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Fig. 15

Distribution of equivalent stress during welding of subassembly 1

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Fig. 16

Distribution of stress during welding of subassembly 1: (a) longitudinal srress σx and (b) transverse srress σy

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Fig. 17

Distribution of displacements on subassembly 1: (a) x-direction, (b) y-direction, and (c) z-direction

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Fig. 18

Distribution of stress in the longitudinal direction (σx) on subassembly 1

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Fig. 19

Distribution of displacement in the z-direction on subassembly 2

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Fig. 20

Distribution of displacement in the z-direction on large-assembly 1

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Fig. 21

Distribution of displacement in the z-direction on large-assembly 2

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Fig. 22

Distribution of displacement in the z-direction on the ship hull block

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Fig. 23

Displacements in the z-direction along line A-B

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Fig. 24

Equivalent stress distribution after all welding assembly sequences



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