Definition(s)

Rope Stiffness

rope modulus

The ratio of rope stress to strain/the ratio of rope tension to elongation.

  • NOTE: Stiffness is often preferred as it is difficult to determine the area for a synthetic rope. Often the terms
  • dynamic modulus/stiffness and static modulus/stiffness are used. Dynamic refers to modulus/stiffness values
  • obtained when the rope is loaded quickly (seconds to minutes) where static refers to modulus/stiffness values
  • obtained when the rope is loaded slowly (hours to days).

Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards

Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards

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