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Materials Technology

On Buckling Collapse of a Fusion-welded Aluminum-stiffened Plate Structure: An Experimental and Numerical Study

[+] Author and Article Information
Jeom Kee Paik

The Lloyd’s Register Educational Trust Research Centre of Excellence,  Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan 609-735, Koreajeompaik@pusan.ac.kr

Bong Ju Kim

The Lloyd’s Register Educational Trust Research Centre of Excellence,  Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan 609-735, Koreabonjour@pusan.ac.kr

Jung Min Sohn, Sung Hoon Kim, Jae Min Jeong, June Seok Park

Department of Naval Architecture and Ocean Engineering,  Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan 609-735, Korea

J. Offshore Mech. Arct. Eng 134(2), 021402 (Dec 02, 2011) (8 pages) doi:10.1115/1.4004511 History: Received July 18, 2009; Revised April 20, 2010; Published December 02, 2011; Online December 02, 2011

The primary objective of the present paper is to experimentally examine the buckling collapse characteristics of fusion welded aluminum-stiffened plate structures under axial compression until and after the ultimate limit state is reached. The secondary objective of the paper is to study a nonlinear finite element method modeling technique for computing the ultimate strength behavior of welded aluminum structures. A set of aluminum-stiffened plate structures fabricated via gas metal arc welding is studied. The test structure is equivalent to a full scale deck structure of an 80 m long high speed vessel. The plate part of the structures is made of 5383-H116 aluminum alloy, and extruded stiffeners are made of 5083-H112 aluminum alloy. Welding induced initial imperfections such as plate initial deflection, column type global initial deflection of stiffeners, sideways initial distortion of stiffeners, welding residual stresses, and softenng in the heat-affected zone are measured. The ANSYS nonlinear finite element method is employed for the numerical computations of the test structure’s ultimate strength behavior by means of a comparison with experimental data. Insights and conclusions developed from the present study are documented.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Photo of the test structure

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Figure 2

Nomenclature of the test structure’s dimensions

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Figure 3

Sectional profile of the extruded stiffener used in the test structure

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Figure 4

(a) The stress-strain curves for the aluminum base material (5383-H116 alloy (rolled)), obtained from tensile coupon tests. (b) The stress-strain curves for the aluminum base material (5083-H112 alloy (extruded)), obtained from tensile coupon tests.

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Figure 5

Schematic of weld-induced initial distortions

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Figure 6

Schematic of weld-induced residual stresses in the plating

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Figure 7

Schematic of weld-induced residual stresses in the stiffener web

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Figure 8

Details of initial distortion measurements in the test structure

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Figure 9

Three-dimensional display of initial distortions (amplified 30 times) in the test structure

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Figure 10

Distribution of residual stress in the test structure

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Figure 11

Photo of the test setup after buckling collapse test

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Figure 12

Photo of the rigid solid bar inserted into the loaded edge

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Figure 13

Photo of the rigid strips bolted to the test panel at the unloaded edge

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Figure 14

Relationship between the axial compressive force and the axial compressive displacement of the test structure

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Figure 15

A three-bay stiffened panel model for the test structure under uniaxial compression

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Figure 16

A view of the finite element model of the test structure in the y-z plane

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Figure 17

A material model for materials in the softened zone in terms of the relationship between the stress (σ) and the strain (ε)

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Figure 18

The axial compressive force versus the axial compressive displacement of the test structure obtained via the buckling collapse test and nonlinear finite element method analysis

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