ah ha! I think. — the characteristics of the 3 waves that come before stick-slip (which part of the process of going from static friction to kinetic friction) I saw these referenced in a few other papers but this is so far the most detailed. “The slip pulse, characterized by a sharp stress front, propagates in the same direction as the Schallamach wave. In contrast, the separation pulse, involving local interface detachment and resembling a tensile neck, travels in exactly the opposite direction. A change in the stick-slip mode from the separation to the slip pulse is effected simply by increasing the normal force. Taken together, the three waves constitute all possible stick-slip modes in low-velocity sliding.” https://pubs.rsc.org/en/content/articlelanding/2016/sm/c6sm00244g#!divAbstract

ah ha! I think. — the characteristics of the 3 waves that come before stick-slip (which part of the process of going from static friction to kinetic friction)

I saw these referenced in a few other papers but this is so far the most detailed.

“The slip pulse, characterized by a sharp stress front, propagates in the same direction as the Schallamach wave. In contrast, the separation pulse, involving local interface detachment and resembling a tensile neck, travels in exactly the opposite direction. A change in the stick-slip mode from the separation to the slip pulse is effected simply by increasing the normal force. Taken together, the three waves constitute all possible stick-slip modes in low-velocity sliding.”

https://pubs.rsc.org/en/content/articlelanding/2016/sm/c6sm00244g#!divAbstract

Could be stick-slip-precursor success? This is for an organism but it looks like the 3 waves I saw in materials science prior to stick slip happening.
Don’t know if this it close to ‘it’ or not – I’ll have to see the paper and see if anybody else made the same comparison I saw. But it’s promising.
 
https://pubs.rsc.org/en/content/articlelanding/2016/sm/c6sm00244g#!divAbstract

 

“Lastly, the occurrence of slow waves, with speeds much
smaller than Rayleigh wave speeds, points to the existence of
additional time scales. These time scales might arise either
from the interfacial friction law
or from the material’s
viscoelastic response.
 
Slow fronts occur in a number of different
material systems, including polymeric glasses,
hydrogels
and
rocks,
with a number of causal mechanisms postulated.
However, these asperity-driven mechanisms are of limited applic-
ability for soft adhesive interfaces. Hence, the microscopic origin of
slow frictional waves remains an open question.”
 
The references for the above — good good – I can compare.
 
48 Y. B. Chernyak and A. I. Leonov, On the theory of the
adhesive friction of elastomers, Wear, 1986, 108(2), 105–138.
49 A. K. Singh and V. A. Juvekar, Steady dynamic friction at
elastomer–hard solid interface: a model based on population
balance of bonds, Soft Matter, 2011, 7(22), 10601–10611.
50 B. N. J. Persson and A. I. Volokitin, Rubber friction on
smooth surfaces, Eur. Phys. J. E: Soft Matter Biol. Phys., 2006,
21(1), 69–80.
51 S. M. Rubinstein, G. Cohen and J. Fineberg, Detachment
fronts and the onset of dynamic friction, Nature, 2004,
430(7003), 1005–1009.
52 B. M. Kaproth and C. Marone, Slow earthquakes, preseismic
velocity changes, and the origin of slow frictional stick-slip,
Science, 2013, 341(6151), 1229–1232.
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