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SUMMARY:Friction and wear in light of elastic interactions between micro c
 ontacts
DTSTART:20220217T160000
DTEND:20220217T170000
DTSTAMP:20260501T142154Z
UID:81da45799e076c2274146d40f3015dfe5076bdb4dbcede76fc6fa292
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jean-François Molinari Computational Solid Mechanics La
 boratory\, Civil Engineering Institute\, Materials Science Institute\, EPF
 L Lausanne\nAbstract: It is well known that man-made and natural surfaces 
 are rough\, with roughness observed over many length scales. An important 
 consequence is that the real contact area is much smaller than the nominal
  contact area\, and is made of micro contacts that vary in size and shape.
  It is well known that elastic interactions between nearby micro contacts 
 matter. Elastic interactions are felt over long distances\, affect the loc
 ation and average size of micro contacts\, and influence the tribological 
 properties. In particular\, in the case of adhesive and abrasive wear\, we
  show how crack shielding mechanisms between nearby asperities promote the
  formation of larger debris\, thereby providing a mechanistic understandin
 g of the transition for mild to severe wear at a critical load.\nWhile the
 se results were initially observed through molecular dynamics simulations\
 , we will discuss our recent efforts at generalizing those early observati
 ons with computationally efficient continuum solvers\, through the boundar
 y-element method or the finite-element method incorporating phase-field mo
 deling of fracture.\nUltimately\, elastic interactions help revise the def
 inition of a contact asperity\, by incorporating nearby contact junctions 
 into an effective contact area. The presentation will also explore optimiz
 ation strategies in order to maximize elastic interactions for more effici
 ent grip or scraping tools technology.
LOCATION:https://ethz.zoom.us/j/94817809233?pwd=N0pzbnQwSFFTQnVPcVR3SkNrd2
 9OQT09
STATUS:CONFIRMED
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