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The generic material database contains the properties of several line materials: chains, steel wires and synthetic ropes. These line materials can be used for anchor, berthing, towing and hawser lines. Each line material is uniquely defined by its name and diameter. The contents of the generic material database cannot be changed. A copy of a leaf can be made into a project’s “Material database” node. Here it is possible to change the line properties.

The following chains are available (Ref. [1, 2]):

Name Diameter
[mm]
Break load
[kN]
Grade 2 20.5 - 177.0 244 - 12808
Grade 3 20.5 - 177.0 349 - 18323
RQ3 20.5 - 177.0 376 - 19725
R3 20.5 - 177.0 397 - 20847
R3S 20.5 - 177.0 443 - 23278
RQ4 20.5 - 177.0 488 - 25615


The following steel wires are available (Ref. [3]):

Name Diameter
[mm]
Break load
[kN]
ISO 2408, 6 strand, grade 180, fibre core 20.0 - 60.0 234 - 2100
ISO 2408, 6 strand, grade 180, steel core 20.0 - 60.0 252 - 2270
ISO 2408, 6 strand, grade 200, steel core 20.0 - 60.0 279 - 2510
ISO 2408, 8 strand, grade 180, steel core 20.0 - 84.0 256 - 4510
ISO 2408, 8 strand, grade 200, steel core 20.0 - 84.0 283 - 5000
American, 6 strand, grade 190, fibre core 25.4 - 44.5 372 - 1099
American, 6 strand, grade 190, steel core 25.4 - 76.2 399 - 3296
American, 6 strand, grade 210, steel core 25.4 - 76.2 460 - 3787

 
Apart from their break loads, the following properties of chains and steel wires are also available:

  • Mass in [kg/m];
  • Submerged weight in [N/m];
  • Stiffness EA in [kN].


 For line dynamics (Dynfloat only) the following drag and inertia coefficients are given (Ref. [4]):

  Inertia Drag
   Normal
Cin
 Tangential
Cit
Normal
Cdn 
 Tangential
Cdt
Chains 3.1 1.7 2.4 0.8
Steel wires 1.6 1.2 1.3 0.4

For the line dynamics it is also possible to apply coefficients for the normal and tangential friction between the chains / steel wires and seafloor. These coefficients have to be supplied by the user.


The following synthetic ropes are available (Ref. [5, 6, 7]):

Name Diameter
[mm]
Break load
[kN]
Polypropylene, 3-8 strand 40.4 - 194.0 190 - 3728
Polyester, 3-8 strand 40.4 - 194.0 234 - 4611
Nylon, 3 strand* 40.4 - 194.0 294 - 5788
Nylon, 8 strand* 40.4 - 194.0 294 - 5788
Nylon, double braid 40.4 - 242.6 353 - 11772
Dyneema, 8 plait 40.0 - 240.0 863 - 30764
Dyneema, wire rope 40.0 - 240.0 1069 - 38033
Dyneema, superline  40.0 - 240.0  991 - 35110
Dyneema, double braid  40.0 - 240.0  657 - 23230

* Although the Nylon 3 and 8 strand ropes have the same diameters and break loads, they have different load-elongation curves.

Synthetic ropes are defined by means of load-elongation curves. In this way their non-linear stiffness behaviour can be accounted for. They don’t have dynamic properties.


References

  1. Chain catalogue, Ramnas.
  2. Chain catalogue, Vicinzy, 1983.
  3. Steel wire catalogue, Den Haan Wire Ropes.
  4. Mooring line dynamics - Phase 1 - Development of a mathematical model, MARIN Report 45064-2-RD, 1984.
  5. Catalogue of synthetic ropes, Hawkins & Tipson Ropemakers Ltd, 1976.
  6. Hawser test report - Data on large synthetic ropes in the used condition, OCIMF, 1982.
  7. Guidelines for deep water port single point mooring design, U.S. Department of Transportation, 1977.
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