The time dependence of static friction is an important aspect of tribological studies whereby the static friction increases with an increase in the time of stationary contact (rest static friction or rest stiction). This effect is commonly observed in computer disk drives especially at high humidities, in which the static friction increases rapidly with an increase in rest time between some head slider and the disk surfaces. For the first time, a comprehensive kinetic meniscus model is proposed to explain this phenomenon, both for a single asperity and multiple asperity contacts at a liquid mediated interface. It is found that the static friction increases up to a certain equilibrium time with a power law relationship after which it remains constant. The equilibrium time is dependent on the liquid film thickness, the liquid viscosity and the contact geometry. The model developed is applied to a rough textured disk, a polished disk and a super smooth disk. To study the effect of the scan size on the meniscus force, the static friction is calculated by using roughness parameters obtained from measurements at different scan sizes.

1.
Adamson, A. W., 1990, Physical Chemistry of Surfaces, 5th ed., Wiley, NY.
2.
Bhushan, B., 1996, Tribology and Mechanics of Magnetic Storage Devices, Second Edition, Springer-Verlag, New York, NY.
3.
Bhushan
B.
and
Blackman
G. S.
,
1991
, “
Atomic Force Microscopy of Magnetic Rigid Disks and Sliders and its Application to Tribology
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
113
, pp.
452
458
.
4.
Bhushan
B.
and
Chilamakuri
S.
,
1996
, “
Non-Gaussian Surface Roughness Distribution of Magnetic Media for Minimum Friction/Stiction
,”
J. Appl Phys.
, Vol.
79
, pp.
5794
5796
.
5.
Bhushan
B.
, and
Dugger
M. T.
,
1990
, “
Liquid-Mediated Adhesion at the Thin Film Magnetic Disk/Slider Interface
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
112
, pp.
217
233
.
6.
de Gennes
P. G.
,
1985
, “
Wetting: Statics and Dynamics
,”
Rev. Mod. Phys.
,
57
,
827
863
.
7.
Derjaguin, B. V., Chuarev, N. V. and Muller V. M., 1987, Surface Forces, Consultants Bureau, NY.
8.
Ganti
S.
and
Bhushan
B.
,
1995
, “
Generalized Fractal Analysis and its Applications to Engineering Surfaces
,”
Wear
, Vol.
180
, pp.
17
34
.
9.
Gao
C.
,
Tian
X.
and
Bhushan
B.
,
1995
, “
A Meniscus Model for Optimization of Texturing and Liquid Lubrication of Magnetic Thin Film Rigid Disks
,”
Tribol. Trans.
, Vol.
38
, pp.
201
212
.
10.
Gao
C.
and
Bhushan
B.
,
1995
, “
Tribological Performance of Magnetic Thin-film Glass Disks: its Relation to Surface Roughness and Lubricant Structure and its Thickness
,”
Wear
, Vol.
190
, pp.
60
75
.
11.
Gerber
C.
,
Bhushan
B.
and
Gitis
N.
1996
, “
Experimental Study of Long-term Static Friction and Magnetic Slider/Disk Separation
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
118
, pp.
12
20
.
12.
Gitis
N. V.
and
Volpe
L.
,
1992
, “
Nature of Static Friction Time Dependence
,”
J. Phys. D: Appl. Phys.
, Vol.
25
, pp.
605
612
.
13.
Greenwood, J. A. and Williamson, J. B. P., 1966, “Contact of Nominally Flat Surfaces,” Proc. Royal Soc. (London), Series A295, pp. 300–319.
14.
Huh
C.
, and
Mason
S. G.
,
1977
, “
Effect of Surface Roughness on Wetting
,”
J. Colloidal and Interface Science
, Vol.
60
, pp.
11
38
.
15.
Israelachvili, J. N., 1992, Intermolecular and Surface Forces, Academic Press, San Diego, CA
16.
Israelachvili, J. N., 1995, “Surface Forces and Microrheology of Molecularly Thin films,” Handbook of Micro/Nanotribology, B. Bhushan, ed., pp. 267–319, CRC Press, Boca Raton, FL.
17.
Kato
S.
,
Sato
N.
and
Matsubayashi
T.
,
1972
, “
Some Considerations on Characteristics of Static Friction of Machine Tool Slideway
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
94
, pp.
234
237
.
18.
Kotwal
C. A.
and
Bhushan
B.
,
1996
, “
Contact Analysis of Non-Gaussian Surfaces for Minimum Static and Kinetic Friction and Wear
,”
Trib. Trans.
, Vol.
39
, pp.
890
898
.
19.
Li, Y. and Talke, F. E., 1990, “A Model for the Effect of Humidity on Stiction of the Head/Disk Interface,” Tribology and Mechanics of Magnetic Storage Systems, B. Bhushan, ed., SP-29, 79–84, STLE, Park Ridge, III.
20.
Mate
C. M.
,
1992
, “
Application of Disjoining and Capillary Pressure to Liquid Lubricant Films in Magnetic Recording
,”
J. Appl. Phys.
, Vol.
72
, pp.
3084
3090
.
21.
Mate
C. M.
and
Novotny
V. J.
,
1991
, “
Molecular Conformation and Disjoining Pressure of Polymeric Liquid Films
,”
J. Chem. Phys.
, Vol.
94
, pp.
8420
8427
.
22.
Nguyen, H. V. and Homola, A. M., 1991, “Meniscus and Bridging Forces between Surfaces Coated with Molecularly Thin Films,” unpublished.
23.
Novotny
V. J.
,
1990
, “
Migration of Liquid Polymers on Solid Surfaces
,”
J. Chem. Phys.
, Vol.
92
, pp.
3189
3196
.
24.
Orr
F. M.
,
Scriven
L. E.
and
Rivas
A. P.
,
1975
, “
Pendular Rings Between Solids: Meniscus Properties and Capillary force
,”
J. Fluid Mechanics
, Vol.
67
, pp.
723
742
.
25.
Poon
C. Y.
and
Bhushan
B.
,
1995
a, “
Comparison of Surface Roughness Measurements by Stylus Profiler, AFM and Non-Contact Optical Profiler
,”
Wear
, Vol.
190
, pp.
76
88
.
26.
Poon
C. Y.
and
Bhushan
B.
,
1995
b, “
Surface Roughness Analysis of Glass-Ceramic Substrates and Finished Magnetic Disks, and Ni-P Coated Al-Mg and Glass Substrates
,”
Wear
, Vol.
190
, pp.
89
109
.
27.
Stanley
H. M.
,
Etison
I.
and
Bogy
D. B.
,
1990
, “
Adhesion of Contacting Rough Surfaces in the Presence of Sub-Boundary Lubrication
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
112
, pp.
98
104
.
28.
Szidarovszky, F. and Yakowitz S., 1978, Principles and Procedures of Numerical Analysis, Plenum Press, New York.
29.
Teletzke
G. F.
,
Davis
H. T.
and
Scriven
L. E.
,
1987
, “
How Liquids Spread on Solids
,”
Chem. Eng. Comm.
, Vol.
55
, pp.
41
82
.
30.
Tian
H.
and
Matsudaira
T.
,
1993
, “
The Role of Relative Humidity, Surface Roughness and Liquid Build-up on Static Friction Behavior of the Head/Disk Interface
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
115
, pp.
28
35
.
31.
Tian
X.
and
Bhushan
B.
,
1996
a, “
A Numerical Three-Dimensional Model for the Contact of Rough Surfaces by Variational Principle
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
118
, pp.
33
42
.
32.
Tian
X.
and
Bhushan
B.
,
1996
b, “
The Micro-Meniscus Effect of a Thin Liquid Film on the Static Friction of Rough Surface Contact
,”
J. Phys. D: Appl. Phys.
, Vol.
29
, pp.
163
178
.
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