3D PDF of Frictional Stress along Inside of Barrel.

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Finite element analysis of a parallel-lay rope termination.

The 3D pdf above shows the frictional stress along the inside of the barrel, during first loading to 60%, cycling between 5% and 50%, then re-loading to 100%, and finally unloading to 0%.

On first loading, slip is occurring along the length of the barrel, the spike is pulled into the termination, so the contact pressure rises, therefore the frictional stress also rises. The friction is slightly higher at the ends due to the geometry of the termination. When the load in the rope is cycled, the rope moves in and out of the termination and slips over the barrel, the plateaus indicate the areas where the friction has reached the critical limit and sliding is occurring. The miniature peaks at the edge of the slipping plateaus are due to the static friction being greater than the dynamic, therefore when slip occurs the friction drops - the peaks are where the rope is still stuck. No slip occurs at the base of the termination. On reloading to 60\% the preloaded state is regained with the frictional stress plateauing along the entire length as slip occurs.