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Research Papers: Polar and Arctic Engineering

On the Crashworthiness of Steel-Plated Structures in an Arctic Environment: An Experimental and Numerical Study

[+] Author and Article Information
Dae Kyeom Park

The Korea Ship and Offshore Research Institute
(The Lloyd's Register Foundation Research Centre of Excellence),
Pusan National University,
Busan 609-735, Korea
e-mail: greatddalgi@pusan.ac.kr

Do Kyun Kim

Department of Civil
and Environmental Engineering,
Universiti Teknologi Petronas,
Bandar Seri Iskandar,
Perak 32610, Malaysia
e-mail: do.kim@petronas.com.my

Chang-Hee Park

STX Offshore & Shipbuilding,
Changwon, Gyeongsangnam-do 645-703, Korea
e-mail: changhee001@onestx.com

Dong Hee Park

Samsung Heavy Industries Co., Ltd.,
Geoje-si, Kyungsangnam-do 656-710, Korea
e-mail: donghee.park@samsung.com

Bong Suk Jang

Steel Flower Co., Ltd.,
Busan 612-020, Korea
e-mail: rad0529@steelflower.co.kr

Bong Ju Kim

The Korea Ship and Offshore Research Institute
(The Lloyd's Register Foundation Research Centre of Excellence),
Pusan National University,
Busan 609-735, Korea
e-mail: bonjour@pusan.ac.kr

Jeom Kee Paik

The Korea Ship and Offshore Research Institute
(The Lloyd's Register Foundation Research Centre of Excellence),
Pusan National University,
Busan 609-735, Korea;
Department of Mechanical Engineering,
University College London,
Torrington Place, London WC1E 7JE, UK
e-mail: jeompaik@pusan.ac.kr

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 September 7, 2010; final manuscript received July 8, 2015; published online August 12, 2015. Assoc. Editor: Søren Ehlers.

J. Offshore Mech. Arct. Eng 137(5), 051501 (Aug 12, 2015) (11 pages) Paper No: OMAE-10-1092; doi: 10.1115/1.4031102 History: Received September 07, 2010

Structural crashworthiness with regard to crushing and fracture is a key element in the strength performance assessment of ship collisions in the Arctic. The aim of this study is to investigate the crashworthiness characteristics of steel-plated structures subject to low temperatures that are equivalent to the Arctic environment. The effect of low temperatures on the material properties is examined on the basis of tensile tests. Crushing tests are undertaken on steel-square tubes subject to a quasi-static crushing load at both room and low temperatures. The crushing behavior of the square tubes in this test is compared with ls-dyna computations. It is found that low temperatures have a significant effect on not only the material properties but also the crashworthiness of steel-plated structures in terms of mean crushing loads and brittle fracture. It is suggested that the collision-accidental limit state design of ships intended to operate in the Arctic region should be carried out by taking the effect of low temperatures into account.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Tensile test specimen

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Fig. 2

1000 kN UTM with a liquid nitrogen-cooled environmental chamber system

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Fig. 3

Schematic of tensile test setup

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Fig. 4

Tensile test setup with surface temperature monitoring method

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Fig. 5

Material properties at low temperature: (a) yield strength, (b) tensile strength, and (c) fracture strain

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Fig. 6

Engineering stress versus engineering strain curves at low temperatures

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Fig. 7

Comparison of material properties at low with an existing database [1,31]: (a) comparison of tensile strength and (b) comparison of fracture strain

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Fig. 8

Steel-plated test structure

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Fig. 9

Fabrication of the test structure

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Fig. 10

Quasi-static crushing test setup with 5000 kN actuator and environmental chamber

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Fig. 11

Temperature control history for crushing tests at low temperature

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Fig. 12

Crushing test results at room temperature: (a) crushing force versus indentation curves at room temperature, (b) selected photos during the crushing test at room temperature, and (c) test structure after crushing test at room temperature

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Fig. 13

Crushing test results at −40 °C: (a) crushing force versus indentation curves at −40 °C, (b) selected photos during the crushing test at −40 °C, and (c) test structure after crushing test at −40 °C

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Fig. 14

Crushing test results at −60 °C (a) crushing force versus indentation curves at −60 °C, (b) selected photos during the crushing test at −60 °C, and (c) test structure after crushing test at −60 °C

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Fig. 15

Crushing test results at –80 °C (a) crushing force versus indentation curves at −80 °C, (b) selected photos during the crushing test at −80 °C, and (c) test structure after crushing test at −80 °C

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Fig. 16

Crushing force versus indentation curves at different temperatures

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Fig. 17

Modeling of crushed thin-walls using eight plate-shell elements

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Fig. 18

FE model with a 5 mm of mesh size

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Fig. 19

Boundary conditions of FEA

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Fig. 20

Stress versus strain curves for material modeling in FEA: (a) room temperature, (b) −40 °C, (c) −60 °C, and (d) −80 °C

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Fig. 21

Stress contours from tensile test simulation with 5 mm-shell elements by ls-dyna

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Fig. 22

ls-dyna computation results at room temperature: (a) crushing force versus indentation curves at room temperature and (b) selected photos during the crushing simulation at room temperature

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Fig. 23

ls-dyna computation results at −40 °C: (a) Crushing force versus indentation curves at −40 °C and (b) selected photos during the crushing simulation at −40 °C

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Fig. 24

ls-dyna computation results at −60 °C: (a) crushing force versus indentation curves at −60 °C and (b) selected photos during the crushing simulation at −60 °C

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Fig. 25

ls-dyna computation results at −80 °C: (a) crushing force versus indentation curves at −80 °C and (b) selected photos during the crushing simulation at −80 °C

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