DYNAMIC TESTING OF LOAD HANDLING WIRE ROPE AND SYNTHETIC ROPE
1970
Capadona, Emanuel A.
A testing program was initiated by U. S. Naval Civil Engineering Laboratory to conduct dynamic tests on torque balanced wire and synthetic rope. The tests were conducted at the laboratories of Preformed Line Products Company, Cleveland, Ohio. The scope of the work was to provide data so that a basis can be established to select the best type of line for load-handling purposes in the deep ocean environment. The tests consisted of tension vs elongation, rotation and kink formation, and longitudinal dynamic response. The tension elongation tests yielded data typical to stranded line construction. The rotation-kink tests revealed that negligible rotations resulted in the test cables when under load and that no kinks were formed when the load was suddenly released. The dynamic response tests showed that the measured dynamic stresses were dependent upon the exciting frequency. The natural frequency for the synthetic rope sample was 0.3 cps and 0.6 cps for the wire rope. The tests indicated that the highest values of combined static and dynamic stresses occur at resonance which could cause failure of the cable at points of high stress concentration. It is recommended that some hydraulic parameters and random excitation be introduced in the future testing of this type. Stress relieving fittings should be investigated for use on load handling lines in the ocean environment.
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