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Research Papers: Materials Technology

Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions

[+] Author and Article Information
Martin Storheim

Moss Maritime AS,
Vollsveien 17a,
P.O. Box 120,
Lysaker 1325, Norway
e-mail: martin.storheim@mossww.com

Hagbart S. Alsos

MARINTEK,
SINTEF Ocean,
Otto Nielsens veg 10
Trondheim 7052, Norway
e-mail: hagbart.alsos@sintef.no

Jørgen Amdahl

AMOS—Centre for Autonomous
Marine Operations and Systems,
Norwegian University of
Science and Technology,
Otto Nielsens veg 10,
Trondheim 7052, Norway
e-mail: jorgen.amdahl@ntnu.no

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 26, 2017; final manuscript received November 16, 2017; published online January 9, 2018. Assoc. Editor: Marcelo R. Martins.

J. Offshore Mech. Arct. Eng 140(4), 041401 (Jan 09, 2018) (7 pages) Paper No: OMAE-17-1044; doi: 10.1115/1.4038585 History: Received March 26, 2017; Revised November 16, 2017

Evaluation of the nonlinear structural response of any structure is a challenging task; a range of input parameters are needed, most of which have significant statistical variability and the evaluations require a high degree of craftsmanship. Hence, high demands are set forth both to the analyst and the body in charge of verification of the results. Recent efforts by DNVGL attempt to mitigate this with the second edition of the DNVGL-RP-C208 for the determination of nonlinear structural response, in which guidance or requirements are given on many of the challenging aspects. This paper discusses the various challenges and the direction to which the RP-C208 points compared to published research. Parameters affecting the plastic hardening, strain-rate effects, and ductile fracture are discussed separately. Then, the combined effect of the range of assumptions is evaluated to assess the resulting level of safety.

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References

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Figures

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Fig. 1

Yield ratios for high-strength steels

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Fig. 2

Definition of normalized energy

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Fig. 3

Force–displacement results from simulation of the plate tearing tests from Simonsen and Törnqvist [18], 5 mm steel plate, element length equal to thickness

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Fig. 4

Force–displacement results from simulation of the indentation experiment two flatbar stiffeners from Alsos and Amdahl [19]. Continuous lines are with element length equal to thickness, whereas dashed lines are with element length ten times the thickness.

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Fig. 5

Graphical view of statistical comparison of behavior of the tested fracture criteria: (a) material tests, peak force; (b) all tests, peak force; (c) stiffened panels, peak force; and (d) stiffened panels, end of simulation

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