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.

References

References
1.
Banfield
,
S.
, and
Casey
,
N.
,
1998
, “
Evaluation of Fiber Rope Properties for Offshore Mooring
,”
Ocean Eng.
,
25
(
10
), pp.
861
879
.
2.
Del Vecchio
,
C. J. M.
,
1992
, “
Light Weight Materials for Deep Water Moorings
,” Ph.D. thesis, Reading University, Reading, UK.
3.
Fernandes
,
A. C.
,
Del Vecchio
,
C. J. M.
, and
Castro
,
G. A. V.
,
1999
, “
Mechanical Properties of Polyester Mooring Cables
,”
Int. J. Offshore Polar
,
9
(
3
), pp.
208
213
.
4.
Bosman
,
R. L. M.
, and
Hooker
,
J.
,
1999
, “
The Elastic Modulus Characteristics of Polyester Mooring Ropes
,”
31st Offshore Technology Conference
, Vol.
3
,
Houston, TX
, Paper No. OTC 10779, pp.
139
143
.
5.
Casey
,
N.
, and
Banfield
,
S.
,
2002
, “
Full-Scale Fiber Deepwater Mooring Ropes: Advancing the Knowledge of Spliced Systems
,”
34th Offshore Technology Conference
, Vol.
1
,
Houston, TX
, Paper No. OTC 14243, pp.
2189
2201
.
6.
Davies
,
P.
,
Francois
,
M.
,
Grosjean
,
F.
,
Baron
,
P.
,
Salomon
,
K.
, and
Trassoudaine
,
D.
,
2002
, “
Synthetic Mooring Lines for Depths to 3000 Meters
,”
34th Offshore Technology Conference
, Vol.
1
,
Houston, TX
, Paper No. OTC 14246, pp.
2225
2233
.
7.
Liu
,
H. X.
,
Huang
,
W.
,
Lian
,
Y. S.
, and
Li
,
L. A.
,
2014
, “
An Experimental Investigation on Nonlinear Behaviors of Synthetic Fiber Ropes for Deepwater Moorings Under Cyclic Loading
,”
Appl. Ocean Res.
,
45
(
1
), pp.
22
32
.
8.
Williams
,
J. G.
,
Miyase
,
A.
,
Li
,
D.
, and
Wang
,
S. S.
,
2002
, “
Small-Scale Testing of Damaged Synthetic Fiber Mooring Ropes
,” 34th
Offshore Technology Conference
, Vol.
1
, Houston, TX, Paper No. OTC 14308MS, pp.
2717
2729
.
9.
Ward
,
E. G.
,
Ayres
,
R. R.
,
Banfield
,
S. J.
,
O'Hear
,
N.
, and
Laurendine
,
T.
,
2006
, “
The Residual Strength of Damaged Polyester Ropes
,”
38th Offshore Technology Conference
, Vol.
1
,
Houston, TX
, Paper No. OTC 18150MS, pp.
3627
3643
.
10.
Flory
,
J.
,
2008
, “
Assessing Strength Loss of Abraded and Damaged Fiber Rope
,”
OCEANS 2008—MTS/IEEE
Conference, Vol.
1
,
Kobe, Japan
, Apr. 8–11, pp.
1376
1387
.
11.
Karayaka
,
M.
,
Srinivasan
,
S.
, and
Wang
,
S. S.
,
1999
, “
Advanced Design Methodology for Synthetic Moorings
,”
Offshore Technology Conference
, Vol.
3
,
Houston, TX
, Paper No. OTC 10912, pp.
369
373
.
12.
Beltran
,
J. F.
,
Rungamornrat
,
J.
, and
Williamson
,
E. B.
,
2003
, “
Computational Model for the Analysis of Damaged Ropes
,”
13th International Society of Offshore and Polar Engineers Conference
, Vol.
1
,
Honolulu, HI
, Paper No. ISOPE-I-03-105, pp.
705
710
.
13.
Beltran
,
J. F.
, and
Williamson
,
E. B.
,
2004
, “
Investigation of the Damage-Dependent Response of Mooring Ropes
,”
14th International Society of Offshore and Polar Engineers Conference
, Vol.
1
,
Toulon, France
, Paper No. ISOPE-I-04-184, pp.
175
183
.
14.
Beltran
,
J. F.
, and
Williamson
,
E. B.
,
2005
, “
Degradation of Rope Properties Under Increasing Monotonic Load
,”
Ocean Eng.
,
32
(
7
), pp.
826
844
.
15.
Beltran
,
J. F.
, and
Williamson
,
E. B.
,
2009
, “
Investigation of the Damage-Dependent Response of Mooring Ropes
,”
ASCE J. Eng. Mech. Div.
,
135
(
11
), pp.
1237
1247
.
16.
Beltran
,
J. F.
, and
Williamson
,
E. B.
,
2010
, “
Numerical Simulation of Damage Localization in Polyester Mooring Ropes
,”
ASCE J. Eng. Mech. Div.
,
136
(
8
), pp.
945
959
.
17.
Duggal
,
A. S.
,
2010
, “
Anchor Leg System Integrity From Design Through Service Life
,”
42nd Offshore Technology Conference
, Vol.
4
,
Houston, TX
, May 3–6, Paper No. OTC 21012MS, pp.
3217
3231
.
18.
McKenna
,
H. A.
,
Hearle
,
J. W. S.
, and
O'Hear
,
N.
,
2004
,
Handbook of Fibre Rope Technology
,
Woodhead Publishing Ltd./CRC Press
,
Abington Cambridge, UK
, Chap. 7.
19.
American Petroleum Institute (API)
,
2014
,
Recommended Practice for Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring
,
2nd ed.
,
API Press
,
Washington, DC
.
20.
American Petroleum Institute (API)
,
2007
,
Addendum to Recommended Practice for Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring
,
API Press
,
Washington, DC
.
21.
Fernandes
,
A. C.
, and
Rossi
,
R. R.
,
2004
, “
Distorted Polyester Lines for Model Testing of Offshore Moored Platforms
,”
Ocean Eng.
,
32
(
7
), pp.
817
825
.
22.
Vlasblom
,
M. P.
,
Boesten
,
J.
,
Leite
,
S.
, and
Davies
,
P.
,
2012
, “
Development of HMPE Fiber for Permanent Deepwater Offshore Mooring
,”
44th Offshore Technology Conference
, Vol.
4
,
Houston, TX
, Apr. 30–May 3, Paper No. OTC 23333, pp.
3449
3464
.
You do not currently have access to this content.