What does it take for nip, how does it function, and the effects?
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For me/my imagery is a concept of greater vs. lesser “Tensioned Rigid Density” prevail, along with if linear pull or not as employed etc.
But also the nipped ‘victim’ , between the vice of ‘backstop’(could be host) and nip force, is specifically deformed by ‘trench’/‘canal’ across it at least to 1side; to really function as nip as I imagine it.
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i think force amount is more important in flexible/rope than rigids.
in that, in rigids have a vice of force X native rigidity X density /footprint intensity in trapping a cross member.
in flexible/rope the imposing rigidity is native rigidity xTension
so somehow have a compounding effect of tension(force expressed) x tension (rigidity expressed) in this vice/sandwiching vs. rigids to me.
That leads to greater tensioned rigidity biting into/canaling across much lesser ; even in internal soft(body) tissue.
What does it take for nip, how does it function, and the effects?
Pressure & friction and … enough to arrest movement.
But then this will depend upon materials & forces.
Charles Warner tried a notion of “distributed nip”;
I’m not sure how much many nips are generally
at least somewhat distributed --aided by pressures
& friction in parts coming before the indicated “nip”.
!?
–dl*
ps : The postal carrier might have an idea of nip (& local nippers),
as should Jack Frost.
Fishing for crushing pinch of softer part by much greater rigidity kinda..but not much talk on functional rigidity of flexibles..
so not dainty, nor equal, nor just a tad more tension and rigidity than to overcome,
but wide rigidity difference between nipper and nippee to set much greater imposing rigidity across lesser.
i think of this as part of basic ‘Square Lessons’ of 1 bight constructions >>minimal examples of least clutter
some balancing on precipe of fail if choose wrong this or that binary (Square as Bend, Whatknot and other Evil Imposters) to illuminate factors most dramatically.
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Rope seating to host gives rope controls of frictions (also nips and grips POSITIONS).
The friction drops the xTension (multiplier) of pull along the length (so now less likely to pull out);
BUT, as sometimes more importantly, decreases the rope rigidity across length/thru radius, as key to the nipping mechanics(not talked about much).
https://upload.wikimedia.org/wikipedia/commons/6/64/Changes-in-rigidity-factors-thru-simple-bight-to-allow-a-real-nip-compression-deformity-blockade-in-rope.png
i don’t look at something as nipped(but rather more just held into place) until about a canal across softer rope part that nips “in the bud” any ‘growth’ from BE to system/knot;
But at same time, this ‘canal’ allows the outer, greater, un-deformed, prevailing rope part to slide tighter etc. across canal ‘bed’
Holding in place with equal rigidity is from outside the linear path, nipping is an impediment in the linear path.
Am always looking at how rigid a point in a knot is when examining.
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To control anything, must at least match forces,
but really is best to overwhelm so i think that looking to greatly reduce tension to then nip with full force so much that the BE is loose and fluffy stopper that can’t make it thru the nip point. The friction adjustment to tension/thus rigidity gives us this, for rope to overwhelm self.
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In rigids by cross-example would have the pressure of the vice jaws x 0-1.0 multiplier of jaw hardness for delivery against the ‘victim’ nipped in the vice(100# crunch with marshmallow jaws would not hurt too bad until jaws compressed rigid).
Even with iron jaws could still get slip inside sandwich unless jaws compressed into/key slotted the center or it came that way.
Rope, by varying “Tensioned Rigidity” dramatically, that then automate the denting/key slotting in a real nip
rope/flexibles self adjust correctly to many things that might other wise have to carve/chip/soften to reform to get same max result in other materials that are not so self adjusting, maximizing and equalizing etc. on the fly.
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So in flexibles example have tension pressure of the vice jaws x 0-1.0 multiplier of jaw hardness(that is native density rating xTension)
So xTension appears as force and rigidity, for a more squared effect in vice/nip when xTension is changed “Tensioned Rigidity”
(partially named for what i feel in leg ‘soft tissue’ during spasm…)
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Then have “Tensioned Rigid Density” for mixed diameters footprint;
to explain smaller diameter cord needed in 2 leg Friction Hitch to ‘fatter’ host lifeline.
(each leg half loaded but of more dense concentration can impose on greater tension but fluffier host)
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edit: more on blockage of rope flow imagery at narrowed pass of nip.
https://upload.wikimedia.org/wikipedia/commons/a/af/Basic-rope-crossings-in-knots-holding-vs-nipping-rigidities.png