Research Papers: Structures and Safety Reliability

Numerical Investigation on Weld-Induced Imperfections in Aluminum Ship Plates

[+] Author and Article Information
Bai-Qiao Chen

Centre for Marine Technology and Ocean Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
e-mail: baiqiao.chen@centec.tecnico.ulisboa.pt

C. Guedes Soares

Fellow ASME
Centre for Marine Technology and Ocean Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt

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 October 5, 2018; final manuscript received May 8, 2019; published online June 19, 2019. Assoc. Editor: Kazuhiro Iijima.

J. Offshore Mech. Arct. Eng 141(6), 061605 (Jun 19, 2019) (7 pages) Paper No: OMAE-18-1170; doi: 10.1115/1.4043778 History: Received October 05, 2018; Accepted May 09, 2019

The present work aims at better understanding and predicting the thermal and structural responses of aluminum components subjected to welding, contributing to the design and fabrication of aluminum ships such as catamarans, lifesaving boats, tourist ships, and fast ships used in transportation or in military applications. Taken into consideration the moving heat source in metal inert gas (MIG) welding, finite element models of plates made of aluminum alloy are established and validated against published experimental results. Considering the temperature-dependent thermal and mechanical properties of the aluminum alloy, thermo-elasto-plastic finite element analyses are performed to determine the size of the heat-affected zone (HAZ), the temperature histories, the distortions, and the distributions of residual stresses induced by the welding process. The effects of the material properties on the finite element analyses are discussed, and a simplified model is proposed to represent the material properties based on their values at room temperature.

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Fig. 1

Gaussian distributed heat source model

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Fig. 2

Double-ellipsoidal distributed heat source model

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Fig. 3

Flow diagram of the transient thermomechanical analysis model

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Fig. 4

Temperature-dependent material properties of 5052-H32 aluminum alloy: (a) thermal properties and (b) mechanical properties [15]

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Fig. 5

A typical FE model with hexahedra

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Fig. 6

Model of a half plate in the welding experiment in Ref. [15]

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Fig. 7

Comparison of the temperature results in selected locations between the experimental measures and the numerical predictions

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Fig. 8

Numerical results of temperature distribution in the welded plate

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Fig. 9

Numerical results of temperature in a cross section of the welded plate

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Fig. 10

Comparison of the axial residual stress between the experimental measures and the numerical predictions, in the midsection of the plate

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Fig. 11

Distribution of axial residual stress (σzz) along the plate length

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Fig. 12

Model of the stiffened plate with an illustration of boundary conditions in FEA

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Fig. 13

Temperature-dependent material properties for aluminum alloy 6082-T6 [2]

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Fig. 14

Comparison of vertical deformation in different cases



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