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Research Papers: Ocean Space Utilization

Temporary-Creep and Postcreep Properties of Aquaculture Netting Materials With UHMWPE Fibers

[+] Author and Article Information
Heidi Moe-Føre

SINTEF Fisheries and Aquaculture,
Postboks 4762 Sluppen,
Trondheim 7465, Norway
e-mail: Heidi.Moe.Fore@sintef.no

Per Christian Endresen

SINTEF Fisheries and Aquaculture,
Postboks 4762 Sluppen,
Trondheim 7465, Norway
e-mail: Per.Christian.Endresen@sintef.no

Østen Jensen

SINTEF Fisheries and Aquaculture,
Postboks 4762 Sluppen,
Trondheim 7465, Norway
e-mail: Osten.Jensen@gmail.com

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 4, 2013; final manuscript received February 9, 2016; published online April 6, 2016. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 138(3), 031201 (Apr 06, 2016) (6 pages) Paper No: OMAE-13-1065; doi: 10.1115/1.4032893 History: Received July 04, 2013; Revised February 09, 2016

This paper presents test results on temporary-creep properties, recovery of strain postcreep and postcreep tensile properties of a Raschel knitted netting material with a combination of ultrahigh molecular weight polyethylene (UHMWPE) and polyester fibers. Specimens of the material were subjected to uniaxial loading over a period of 30 mins, at a constant creep target load of 10–90% of average tensile strength. The specimens were wet and tested in room temperature. The netting structure experienced creep strain with mean values in the range of 1.3–4.5%, increasing with increased creep target load. In addition, the netting experienced 2% creep strain during on-loading. The creep strains were elastic, while large proportions of the elongation accumulated during on-loading (structural strain of 8.8–27.8%) were long lasting and possibly permanent. Tensile tests showed that for the highest creep target load, strength, and elongation at break increased by 17%.

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Figures

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Fig. 1

Section of tensile test specimen

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Fig. 4

Creep strain as a function of the logarithm of creep time

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Fig. 5

Mean strain rate as a function of creep time (double logarithmic scale)

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Fig. 6

Relative strain postcreep as a function of recovery time

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Fig. 7

Relative strain at the end of the creep period and postcreep as a function of relative creep target load

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Fig. 8

Force-normalized elongation relations 7 days postcreep

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Fig. 9

Normalized elongation at break for netting subjected to various creep loads (mean values with standard deviation)

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Fig. 10

Force at break for netting subjected to various creep loads (mean values with standard deviation)

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Fig. 3

Relative total strain as a function of creep time. Mean values with standard deviation.

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