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Research Papers: Structures and Safety Reliability

Influence of Impact Location on the Plastic Response and Failure of Rectangular Cross Section Tubes Struck Transversely by a Hemispherical Indenter1

[+] Author and Article Information
Bin Liu

Centre for Marine Technology
and Ocean Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa 1049-001, Portugal

C. Guedes Soares

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

2Present address: School of Transportation, Wuhan University of Technology, Wuhan 430063, China.

3Corresponding 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 August 14, 2016; final manuscript received October 6, 2016; published online January 31, 2017. Editor: Solomon Yim.

J. Offshore Mech. Arct. Eng 139(2), 021603 (Jan 31, 2017) (12 pages) Paper No: OMAE-16-1094; doi: 10.1115/1.4034957 History: Received August 14, 2016; Revised October 06, 2016

Drop weight impact tests and numerical simulations have been performed to examine the plastic behavior and failure of clamped rectangular cross section tubes subjected to transverse loads. The selected indenter is a hemisphere with diameter of 20 mm. The tube lengths are 125 and 250 mm, and they are struck at the midspan and the quarter-span. The impact point along the width direction is located at the central position and displaced 10 mm from the center, respectively. The results show that the impact location affects strongly the plastic behavior and failure of the tubes. The impact location displaced along the width increases the energy absorbing capability of the tubes accompanied with an asymmetrical deformation mode. The experimentally recorded force–displacement responses and failure modes show good agreement with the numerical simulations, performed by the LS-DYNA finite-element code. The numerical results show the process of crack initiation and propagation and provide the details to analyze the structural plastic deformation and failure of the tubular specimens under transverse loads. The impact characteristics of the rectangular tubes are well presented based on the relevant failure modes observed in beams, plates, and circular tubes. Moreover, the influence of the impact location on the strength of tube specimens is characterized, and the collapse mechanism of rectangular tubes is described.

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References

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Figures

Grahic Jump Location
Fig. 1

Geometry of the tube specimens and the impact locations. (a) Span length of 125 mm and (b) span length of 250 mm. All impact locations are represented by numbers 1 through 8 in the figure.

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Fig. 2

Engineering stress–strain curve of the steel material (1.4 mm)

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Fig. 3

Experimental supports

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Fig. 4

Fully instrumented Rosand IFW5 falling weight machine

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Fig. 5

Force–displacement responses for different impact locations. (a) Tube length of 125 mm and (b) tube length of 250 mm.

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Fig. 6

Shapes of deformation for the specimens impacted at the central location along the width. (a) 125-M, (b) 125-Q, (c) 250-M, and (d) 250-Q. (1) and (2): The local deformation of upper and lower walls below the indenter. The dashed lines represent the supported edge.

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Fig. 7

Shapes of deformation for the specimens impacted at the displaced location along the width. (a) 125-M-D, (b) 125-Q-D, (c) 250-M-D, and (d) 250-Q-D. (1) and (2): The local deformation of upper and lower walls below the indenter. The dashed lines represent the supported edge.

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Fig. 8

Finite element model of clamped tube

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Fig. 9

Numerical force–displacement responses. (a) 125-M, (b) 125-M-D, (c) 125-Q, (d) 125-Q-D, (e) 250-M, (f) 250-M-D, (g) 250-Q, and (h) 250-Q-D.

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Fig. 10

Numerical shapes of the deformation. (a) 125-M, (b) 125-Q, (c) 250-M, and (d) 250-Q.

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Fig. 11

Numerical shapes of the deformation. (a) 125-M-D, (b) 125-Q-D, (c) 250-M-D, and (d): 250-Q-D.

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Fig. 12

Deformation process of the cross section of specimen 125-M. (a) Deformation process of the cross section of the tube specimen at midspan and (b) varying cross section from the boundary to the midspan of the tube specimen.

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Fig. 13

Deformation process of the cross section of specimen 125-M-D. (a) Deformation process of the cross section of the tube specimen at midspan and (b) varying cross section from the boundary to the midspan of the tube specimen.

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Fig. 14

Deformation profile of specimen 125-M. (a) Initial failure at upper wall and (b) initial failure at lower wall.

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Fig. 15

The cross section of the local deformation below the indenter. The black point indicates the position of the cross-sectional corners. (a) Specimen 125-M and (b) specimen 125-M-D.

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Fig. 16

Deformation profile of specimen 125-M-D. Initial failure occurs at upper wall.

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