Creep as a design tool for HMPE ropes in long term marine and offshore applications

Micro-CT supporting structural analysis and modelling of ropes made of natural fibers

“…the marine offshore industry and deep water installations, heavy lift slings, sailing, fishing, etc. [1][2][3] Different ropes can be distinguished depending on their final application, technical parameters and construction. Common raw materials utilized for production of ropes are semi-aromatic (polyethylene terephthalate) and aromatic polyester (liquid-crystal polymers, especially Vectran), 4,5 high-density polyethylene (HDPE, especially Dyneema and Spectra), 6,7 aromatic polyamides (Twaron, Technora and Kevlar), 8 natural staple fibers (flax, hemp, cotton, jute, sisal) 9 and metals (steel or its alloys).…”

Evaluation of creep behavior of high density polyethylene and polyethylene-terephthalate geogrids

“…On the other hand, the molecular chains in the crystalline phase of the HDPE geogrid start slipping after the primary creep stage (i.e., breaking of secondary bonds) as shown in Fig. 14(c) (Govaert and Peijs, 1995;Smeets et al, 2001). The slippage begins by the ''pullout'' of tie molecules from crystalline regions and leads to the intermolecular shear in crystalline regions which is the dominant mechanism of plastic flow in the secondary creep stage (Sargent and Shinozaki, 1977;Van Der Werff and Pennings, 1991).…”

A creep–rupture model of synthetic fiber ropes for deepwater moorings based on thermodynamics

“…When a constant load is applied to a tensile specimen which can be any components of fiber ropes, the creep-rupture curve including primary, secondary and tertiary regions can be obtained, as shown in Fig. 1, which was observed by lots of researchers [10,[14][15][16][17][18][19][20]. Even though creep rupture experiments is worthy of being systematically conducted and short-term creep behavior is not the area of main interest for mooring engineering, most researchers paid more attention to the short-term creep behavior of synthetic fiber ropes due to the cost of creep rupture tests at the normal temperature and operational load.…”