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