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Research Papers: Materials Technology

An Investigation on Creep and Creep-Rupture Behaviors of HMPE Ropes

[+] Author and Article Information
Yushun Lian

Key Laboratory of Coastal Disaster and Defence,
Ministry of Education;
College of Harbor Coastal and
Offshore Engineering,
Hohai University,
Nanjing 210098, China
e-mails: yushunlian@tju.edu.cn; yushunlian@hhu.edu.cn

Jinhai Zheng

Key Laboratory of Coastal Disaster and Defence,
Ministry of Education;
College of Harbor Coastal and
Offshore Engineering,
Hohai University,
Nanjing 210098, China
e-mail: jhzheng@hhu.edu.cn

Haixiao Liu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China;
Collaborative Innovation Center for Advanced
Ship and Deep-Sea Exploration,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: liuhx@tju.edu.cn

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 April 24, 2017; final manuscript received September 30, 2017; published online November 16, 2017. Assoc. Editor: Theodoro Antoun Netto.

J. Offshore Mech. Arct. Eng 140(2), 021401 (Nov 16, 2017) (8 pages) Paper No: OMAE-17-1064; doi: 10.1115/1.4038345 History: Received April 24, 2017; Revised September 30, 2017

Creep tests of high modulus polyethylene (HMPE) samples are performed to obtain the corresponding creep and creep-rupture curves. The results show that the secondary creep stage is especially pronounced, and its creep rate is nearly constant. Based on this fact, the creep rate at the secondary stage has been utilized as the representative value of each case. Therefore, the similarity criterion of creep rate at secondary stage is proposed to analyze the corresponding relationship between engineering creep rate and that in laboratory tests. Besides, an empirical expression of HMPE yarns is proposed to account for the effects of both loading level and test temperature on the creep rate at the secondary stage. Moreover, an equation for calculating the creep lifetime of HMPE samples is derived and verified by test data. This study will help to improve the understanding of creep behaviors of HMPE ropes and provide a significant reference for the application of HMPE ropes in mooring engineering.

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Copyright © 2018 by ASME
Topics: Creep , Ropes , Rupture , Stress
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References

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Figures

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Fig. 1

Experimental system of synthetic fiber ropes: (a) experimental system and (b) elongation measurement system

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Fig. 2

Mechanical schematic diagram of dynamic loading devices

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Fig. 3

Twelve-strand HMPE rope disassembled into strands

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Fig. 4

Tensile strength curves of the HMPE strands

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Fig. 5

The typical loading history of specimens

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Fig. 6

Creep curves of HMPE strands at low loading levels

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Fig. 7

Creep rate curves of HMPE strands at low loading levels

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Fig. 8

Creep-rupture curves of HMPE strands at high loading levels

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Fig. 9

Creep rate curves of HMPE strands at high loading levels

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Fig. 10

Creep rate of Dyneema SK78 rope and yarn samples [13]

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Fig. 11

Creep rate of Dyneema SK75 yarn at different loading levels and temperatures [13]

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Fig. 12

Creep rate of Dyneema SK78 yarn at different loading levels and temperatures [13]

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Fig. 13

Creep lifetimes of HMPE strands at different loading levels

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Fig. 14

Creep lifetimes of Dyneema SK75 yarn samples at different loading levels and temperatures in the double logarithmic coordinates [13]

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