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Research Papers: Structures and Safety Reliability

Experimental and Numerical Analyses of Dented Stiffened Panels

[+] Author and Article Information
Diogo do Amaral M. Amante

Petrobras Research Center (CENPES),
Cidade Universitária,
Av. Horácio Macedo, 950,
Rio de Janeiro - RJ, CEP 21941-915, Brazil
e-mail: diogoamaral@petrobras.com.br

John Alex Chujutalli

Ocean Engineering Department,
COPPE/UFRJ,
Centro de Tecnologia,
Bloco C, Sala 203,
Cidade Universitária,
Rio de Janeiro - RJ, CEP 21945-970, Brazil
e-mail: john@lts.coppe.ufrj.br

Segen F. Estefen

Ocean Engineering Department,
COPPE/UFRJ,
Centro de Tecnologia,
Bloco C, Sala 203,
Cidade Universitária,
Rio de Janeiro - RJ, CEP 21945-970, Brazil
e-mail: segen@lts.coppe.ufrj.br

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 July 21, 2014; final manuscript received March 4, 2015; published online April 6, 2015. Assoc. Editor: Carlos Guedes Soares.

J. Offshore Mech. Arct. Eng 137(3), 031601 (Jun 01, 2015) (11 pages) Paper No: OMAE-14-1080; doi: 10.1115/1.4030000 History: Received July 21, 2014; Revised March 04, 2015; Online April 06, 2015

Numerical–experimental correlation study for small scale damaged stiffened panels was performed. Six small scale models were fabricated. Two of them were employed for the correlation of intact panels and the remaining four for the correlation of dented panels. Ultimate strength analyses were carried out in order to adjust the numerical model for further use in parametric studies. The damage was imposed by a local indentation of the panels. Measurements of geometric imperfection distributions and damage shapes have been performed before and after the damage using a laser tracker equipment. The numerical models were represented by shell elements assuming finite membrane strains and large rotations, considering both geometric and material nonlinearities. Results obtained showed very good agreement between experimental and numerical analyses for both intact and dented panels. Additionally, numerical simulations of damaged stiffened panels were performed. The aim of the parametric study was to evaluate the behavior up to and beyond buckling, to observe the strength loss due to the presence of the damage on the panel. The explicit nonlinear finite element code from abaqus program was employed to simulate the dent damage. Therefore, distortions and the residual stresses due to the damage were both considered in subsequent numerical compression analyses.

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References

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Figures

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Fig. 1

Small scale stiffened panel

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Fig. 2

True stress (N/mm2) versus logarithmic plastic strain used as input data in the numerical model

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Fig. 3

Instrumentation of the small scale model

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Fig. 4

Setup for applying the damage to the panel

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Fig. 5

Indenters with 15 mm (left) and 35 mm diameters

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Fig. 7

Dent damage 1—final damage

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Fig. 9

Measurement of initial imperfection distribution

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Fig. 10

Software faro cam 2 measure x

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Fig. 11

Initial geometrical imperfection distribution on the plate for the small scale model (amplified 20 times)

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Fig. 12

Initial geometrical imperfection distribution on the plates for the small scale model (amplified ten times)

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Fig. 13

Damage measurement

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Fig. 14

Finite element model of the damaged panel

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Fig. 15

Eigenmode shape of the small scale stiffened panel

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Fig. 16

Force versus axial displacement—dent 2

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Fig. 17

Force versus axial displacement—dent 3

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Fig. 18

Experimental and numerical post-buckling modes—intact model 1

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Fig. 19

Experimental and numerical post-buckling behavior—intact model 2

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Fig. 20

Experimental/numerical post collapse—damage 1

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Fig. 21

Experimental/numerical post collapse—damage 2

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Fig. 22

Experimental/numerical post collapse—damage 3

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Fig. 23

Experimental/numerical post collapse—damage 4

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Fig. 25

Panel and sphere for the damage simulation

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Fig. 26

Stress distribution

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Fig. 28

Load–displacement curves

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Fig. 29

Postbuckling mode—intact panel

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Fig. 30

Postbuckling mode—damage 1

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Fig. 31

Postbuckling mode—damage 2

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Fig. 32

Postbuckling mode—damage 4

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Fig. 33

Postbuckling mode—damage 5

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Fig. 34

Damage final depth: 22.57 mm (mass 5 kg)

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