TY - JOUR
T1 - Static friction boost in edge-driven incommensurate contacts
AU - Mandelli, Davide
AU - Guerra, Roberto
AU - Ouyang, Wengen
AU - Urbakh, Michael
AU - Vanossi, Andrea
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/4/27
Y1 - 2018/4/27
N2 - We present a numerical investigation of the size scaling of static friction in incommensurate two-dimensional contacts performed for different lateral loading configurations. Results of model simulations show that both the absolute value of the force Fs and the scaling exponent γ strongly depend on the loading configuration adopted to drive the slider along the substrate. Under edge loading, a sharp increase of static friction is observed above a critical size corresponding to the appearance of a localized commensurate dislocation. Noticeably, the existence of sublinear scaling, which is a fingerprint of superlubricity, does not conflict with the possibility to observe shear-induced localized commensurate regions at the contact interface. Atomistic simulations of gold islands sliding over graphite corroborate these findings, suggesting that similar elasticity effects should be at play in real frictional contacts.
AB - We present a numerical investigation of the size scaling of static friction in incommensurate two-dimensional contacts performed for different lateral loading configurations. Results of model simulations show that both the absolute value of the force Fs and the scaling exponent γ strongly depend on the loading configuration adopted to drive the slider along the substrate. Under edge loading, a sharp increase of static friction is observed above a critical size corresponding to the appearance of a localized commensurate dislocation. Noticeably, the existence of sublinear scaling, which is a fingerprint of superlubricity, does not conflict with the possibility to observe shear-induced localized commensurate regions at the contact interface. Atomistic simulations of gold islands sliding over graphite corroborate these findings, suggesting that similar elasticity effects should be at play in real frictional contacts.
UR - http://www.scopus.com/inward/record.url?scp=85059583526&partnerID=8YFLogxK
U2 - 10.1103/PhysRevMaterials.2.046001
DO - 10.1103/PhysRevMaterials.2.046001
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AN - SCOPUS:85059583526
SN - 2475-9953
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
IS - 4
M1 - 046001
ER -