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Research Papers: Materials Technology

Experimental Investigation on Dynamic Stiffness of Damaged Synthetic Fiber Ropes for Deepwater Moorings

[+] Author and Article Information
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

Yushun Lian

State Key Laboratory of Hydraulic
Engineering Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: yushunlian@tju.edu.cn

Linan Li

School of Mechanical Engineering,
Tianjin University,
Tianjin 300072, China
e-mail: lali@tju.edu.cn

Yuming Zhang

State Key Laboratory of Hydraulic
Engineering Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: 13821409296@163.com

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 February 20, 2015; final manuscript received August 18, 2015; published online September 10, 2015. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 137(6), 061401 (Sep 10, 2015) (8 pages) Paper No: OMAE-15-1014; doi: 10.1115/1.4031392 History: Received February 20, 2015; Revised August 18, 2015

To understand the evolution of dynamic stiffness of damaged synthetic fiber mooring ropes, experimental investigations of polyester and high modulus polyethylene (HMPE) ropes are systematically performed utilizing a specially designed experimental system. An experimental procedure is proposed and test results show that the dynamic stiffness increases with increasing mean load and loading cycles, while decreases with increasing strain amplitude and damage level. The similarity criterion of dynamic stiffness is derived from the dimensional analysis for damaged ropes and verified by experiments. An empirical expression that accounts for the damage, mean load, strain amplitude, and loading cycles is proposed to describe the damage effect upon dynamic stiffness of synthetic fiber mooring ropes.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Experimental system of synthetic fiber ropes

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Fig. 2

Mechanical schematic diagram of dynamic loading devices

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Fig. 3

(a) Three strand construction polyester ropes. (b) Twelve strand construction HMPE ropes.

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Fig. 4

Static tension–elongation curves of polyester ropes with different size

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Fig. 5

Static tension–elongation curves of HMPE ropes with different size

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Fig. 6

Three strand construction and damage pattern of polyester ropes

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Fig. 7

Twelve strand construction and damage pattern of HMPE ropes

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Fig. 8

Dynamic stiffness evolution of damaged polyester ropes with loading cycles under the condition of Lm = 20%MBL and εa = 0.16%

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Fig. 9

Dynamic stiffness evolution of damaged polyester ropes with loading cycles under the condition of Lm = 40%MBL and εa = 0.16%

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Fig. 10

Dynamic stiffness evolution of damaged polyester ropes with loading cycles under the condition of Lm = 20%MBL and εa = 0.48%

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Fig. 11

Dynamic stiffness evolution of damaged HMPE ropes with loading cycles under the condition of Lm = 20%MBL and εa = 0.13%

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Fig. 12

Dynamic stiffness evolution of damaged HMPE ropes with loading cycles under the condition of Lm = 40%MBL and εa = 0.13%

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Fig. 13

Dynamic stiffness evolution of damaged HMPE ropes with loading cycles under the condition of Lm = 20%MBL and εa = 0.41%

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Fig. 14

Dynamic stiffness of polyester ropes with different size

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Fig. 15

Dynamic stiffness of HMPE ropes with different size

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Fig. 16

Comparison between the measured data and empirical expression for polyester ropes

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Fig. 17

Comparison between the measured data and empirical expression for HMPE ropes

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