The role of asperity indentation and ploughing in rock friction-II. Influence of relative hardness and normal load

J. T. Engelder; C. H. Scholz

doi:10.1016/0148-9062(76)90820-2

The role of asperity indentation and ploughing in rock friction-II. Influence of relative hardness and normal load

J. T. Engelder, C. H. Scholz

Geosciences

Research output: Contribution to journal › Article › peer-review

66 Scopus citations

Abstract

The frictional characteristics of rock forming minerals depend on the relative hardness of the asperity and substrate (flat) upon which it slides; an asperity with a scratch hardness less than a polished flat has a lower static coefficient of friction (μ_s) on that flat than an asperity with a scratch hardness greater than the same flat. Frictional wear associated with the slip of asperities consists of: (1) ploughing by plastic deformation; (2) ploughing by brittle fracture; (3) fracture of the asperity. Stick-slip correlates with ploughing by brittle fracture. Using Griffith's criteria for propagation of flaws, Hertz's analysis for ring cracking and Hamilton and Goodman's analysis for partial ring cracking under an asperity the normal load necessary for crack propagation and thus the onset of stick-slip may be predicted. The propagation of cracks during ploughing by brittle fracture is one mechanism of time-dependent friction.

Original language	English (US)
Pages (from-to)	155-163
Number of pages	9
Journal	International Journal of Rock Mechanics and Mining Sciences and
Volume	13
Issue number	5
DOIs	https://doi.org/10.1016/0148-9062(76)90820-2
State	Published - May 1976

All Science Journal Classification (ASJC) codes

Geotechnical Engineering and Engineering Geology
General Engineering

Access to Document

10.1016/0148-9062(76)90820-2

Cite this

@article{5cb83c948b224b30b857a7ecfb2dd65d,

title = "The role of asperity indentation and ploughing in rock friction-II. Influence of relative hardness and normal load",

abstract = "The frictional characteristics of rock forming minerals depend on the relative hardness of the asperity and substrate (flat) upon which it slides; an asperity with a scratch hardness less than a polished flat has a lower static coefficient of friction (μs) on that flat than an asperity with a scratch hardness greater than the same flat. Frictional wear associated with the slip of asperities consists of: (1) ploughing by plastic deformation; (2) ploughing by brittle fracture; (3) fracture of the asperity. Stick-slip correlates with ploughing by brittle fracture. Using Griffith's criteria for propagation of flaws, Hertz's analysis for ring cracking and Hamilton and Goodman's analysis for partial ring cracking under an asperity the normal load necessary for crack propagation and thus the onset of stick-slip may be predicted. The propagation of cracks during ploughing by brittle fracture is one mechanism of time-dependent friction.",

author = "Engelder, {J. T.} and Scholz, {C. H.}",

note = "Funding Information: Acknowledgement--This work was supported by NSF grants GA36357 and GA43295. We thank Lynn Sykes and Paul Richards for critically reviewing the text. Lamont-Doherty Geological Observatory Contribution No. 2339.",

year = "1976",

month = may,

doi = "10.1016/0148-9062(76)90820-2",

language = "English (US)",

volume = "13",

pages = "155--163",

journal = "International Journal of Rock Mechanics and Mining Sciences and",

issn = "0148-9062",

publisher = "Pergamon Press Ltd.",

number = "5",

}

TY - JOUR

T1 - The role of asperity indentation and ploughing in rock friction-II. Influence of relative hardness and normal load

AU - Engelder, J. T.

AU - Scholz, C. H.

N1 - Funding Information: Acknowledgement--This work was supported by NSF grants GA36357 and GA43295. We thank Lynn Sykes and Paul Richards for critically reviewing the text. Lamont-Doherty Geological Observatory Contribution No. 2339.

PY - 1976/5

Y1 - 1976/5

N2 - The frictional characteristics of rock forming minerals depend on the relative hardness of the asperity and substrate (flat) upon which it slides; an asperity with a scratch hardness less than a polished flat has a lower static coefficient of friction (μs) on that flat than an asperity with a scratch hardness greater than the same flat. Frictional wear associated with the slip of asperities consists of: (1) ploughing by plastic deformation; (2) ploughing by brittle fracture; (3) fracture of the asperity. Stick-slip correlates with ploughing by brittle fracture. Using Griffith's criteria for propagation of flaws, Hertz's analysis for ring cracking and Hamilton and Goodman's analysis for partial ring cracking under an asperity the normal load necessary for crack propagation and thus the onset of stick-slip may be predicted. The propagation of cracks during ploughing by brittle fracture is one mechanism of time-dependent friction.

AB - The frictional characteristics of rock forming minerals depend on the relative hardness of the asperity and substrate (flat) upon which it slides; an asperity with a scratch hardness less than a polished flat has a lower static coefficient of friction (μs) on that flat than an asperity with a scratch hardness greater than the same flat. Frictional wear associated with the slip of asperities consists of: (1) ploughing by plastic deformation; (2) ploughing by brittle fracture; (3) fracture of the asperity. Stick-slip correlates with ploughing by brittle fracture. Using Griffith's criteria for propagation of flaws, Hertz's analysis for ring cracking and Hamilton and Goodman's analysis for partial ring cracking under an asperity the normal load necessary for crack propagation and thus the onset of stick-slip may be predicted. The propagation of cracks during ploughing by brittle fracture is one mechanism of time-dependent friction.

UR - http://www.scopus.com/inward/record.url?scp=0016950167&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0016950167&partnerID=8YFLogxK

U2 - 10.1016/0148-9062(76)90820-2

DO - 10.1016/0148-9062(76)90820-2

M3 - Article

AN - SCOPUS:0016950167

SN - 0148-9062

VL - 13

SP - 155

EP - 163

JO - International Journal of Rock Mechanics and Mining Sciences and

JF - International Journal of Rock Mechanics and Mining Sciences and

IS - 5

ER -

The role of asperity indentation and ploughing in rock friction-II. Influence of relative hardness and normal load

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this