Fibre ropes. Determination of certain physical and mechanical properties
Fibre ropes. Determination of certain physical and mechanical properties
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1 Scope This International Standard specifies, for ropes of different kinds, a method of determining each of the following characteristics:
- linear density;
- lay length;
- braid pitch;
- elongation;
- breaking force.
The linear density, lay length and braided pitch are measured with the rope under a specified tension called the reference tension, as specified in Annex A. The elongation corresponds to the measured increase in length of the rope when the tension to which it is subjected is increased from an initial value (reference tension) to a value equal to 50 % of the minimum specified breaking strength of the rope. The breaking force is the maximum force registered (or reached) during a breaking test on the test piece, carried out on a tensile testing machine with constant rate of traverse of the moving element. The breaking force values given in the tables of rope specifications are only valid when this type of testing machine is used. When it is not possible to test the whole section of rope, the method described in Annex B can be used, subject to agreement between the parties involved. This International Standard also provides a method for measuring water repell...
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