Whoopie Thickness vs. Stretch

[DemostiX]

You'll find your answers here.

Terrific.

Thanks Ron, and I know where to go for statements on testing and specifications more recent than those contained in some research papers.

Not to mention that

• 40% derating is estimated by Samson to be high 20% derating is a better estimate from testing
• the unavoidable stress riser /discontinuity is indeed the point of failure, and
• by implication, the reduction of stress riser by tapering the bury -- not possible with the whoopie as it is with the fixed eye-- is important to increasing strength of a buried splice.

So, it is valuable to check and respect the research rather than a vendor's authority; remember what the research and field finding are; and draw inferences about the the mechanism which are consistent with and informed by behavior of other materials under stress.

It would have been appropriate if everyone who participated in the cited thread had remembered what was explained and understood there. There would then not have been in another recent thread a dispute about the value of the tapering the bury in the splice. The taper is not primarily so it is easier to push or pull the bury. Tapering in the prescribed manner is optional only if you wish to permit the cord to break with a lower load. That wouldn't seem smart when loads of assembled cords reduce margins of working to maximum load to well below 12, 10, or even 5 to one ratios.