A rope will stretch to some degree under a load. The amount of stretch depends on the type of rope and the load.


The load is usually reported as the percent of the breaking strength, so ranges from 0 to 99%. As the load increases the length of elongation tends to increase but this may be nonlinear.


Behavior of Rope After Load Removed

Type of Elongation

returns to its original length


does not return to original length (length after strain removed greater than before placed)



length of elastic elongation =

= (length under a given load) - (length without load)


elastic elongation as percent of original length =

= (length of elastic elongation) / (length without load) * 100%


A segment of rope may undergo repetitive testing to determine an average value.

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