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Friction Coefficient

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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005417
EISBN: 978-1-62708-196-2
... dynamic response of equipment. The article reviews the determination of friction coefficient using laboratory monitoring methods, indirect measurements, and the inverse method. It considers the determination of the interface heat-transfer coefficient by using the ring test and computer simulations. The...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003030
EISBN: 978-1-62708-200-6
... in a computerized database. ASTM G 115-93, “Standard Guide for Measuring and Reporting Friction Coefficients” ( Ref 17 ), tabulates current ASTM friction tests standards, points out the factors that must be considered when determining coefficients of friction, and suggests a standard reporting format...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005677
EISBN: 978-1-62708-198-6
... follows an exponential function, whereas the tangential force (friction) increases linearly with normal load ( Ref 41 ). The coefficient of friction is not a perfect indicator of wear. The track width data indicate that the principal mechanisms for the accommodation of strain are elastic deformation and...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005678
EISBN: 978-1-62708-198-6
... hip and the knee, operate with average coefficients of friction of about 0.02 and wear factors of about 10 −6 mm 3 /N · m. Like many bearings, they tend to deteriorate with time, and in due course the bearing material roughens, fissures, and wears away to expose the underlying bone. This process...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... Abstract Friction and wear are important when considering the operation and efficiency of components and mechanical systems. Among the different types and mechanisms of wear, adhesive wear is very serious. Adhesion results in a high coefficient of friction as well as in serious damage to the...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009008
EISBN: 978-1-62708-185-6
... approximating the strain paths as second order equations, the coefficients of the linear and quadratic terms are correlated statistically to the specimen aspect ratio (H/D) and friction. In addition, finite element analyses of the upsetting process (e.g., Ref 14 ) have been performed to determine the strain...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005668
EISBN: 978-1-62708-198-6
... discusses various in vivo environmental conditions in tribological tests. Some typical examples of biomaterials testing are also provided. biomaterials electrical contact resistance friction coefficient linear reciprocating motion orthopaedic coatings pin-on-disk method tribocorrosion...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009009
EISBN: 978-1-62708-185-6
... − exp ( − h T t c ρ h a ) ] where σ a is the measured average stress, h a is the average height of the specimen, h T is the heat-transfer coefficient between the platen and the specimen, m is the friction factor between the platen and the specimen, t is the time...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003021
EISBN: 978-1-62708-200-6
.... Frictional heating is important in the ultrasonic, vibration, and spin welding methods. In ultrasonic welding, heat generation depends on the storage and loss moduli of the polymer. In the cases of vibration and spin welding, heat generation depends on the frictional coefficient of the polymer material and...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009007
EISBN: 978-1-62708-185-6
... material, σ 0 : (Eq 11) p ¯ σ 0 = ( h 4 μ a ) 2 ( e 2 μ a / h − 2 μ a h − 1 ) where a is the radius of the cylinder, and μ is the Coulomb coefficient of friction. The true compressive strain, ε, is given by: (Eq 12) ε = ln...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003135
EISBN: 978-1-62708-199-3
... nickel silver P/M parts, copper-nickel P/M parts, copper-lead P/M parts, copper-base P/M friction materials, copper-base P/M electrical contact materials, copper-base P/M brush materials, infiltrated parts, and oxide-dispersion-strengthened copper P/M materials. copper alloy powders copper powders...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009013
EISBN: 978-1-62708-185-6
..., the parameters likely to influence grain size should be considered. Some parameters are easily contemplated, such as initial grain size, temperature, strain, and deformation rate. Other parameters are less obvious, such as prior thermomechanical history or frictional effects. The numbered examples...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004025
EISBN: 978-1-62708-185-6
... temperature changes with local heating by deformation and friction. The two most common methods of measuring specific heat are differential thermal analysis (DTA) and differential scanning calorimetry (DSC). Figure 14 shows a DTA cell, in which a specimen (S) and a reference (R) are heated by a single...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005430
EISBN: 978-1-62708-196-2
... 10 −9 … 10 −15 to 10 −11 Conductivity (ionic crystals) … 10 −17 to 10 −10 Resistivity (semiconductors) … 10 −20 to 10 −12 Elastic after-effect … 10 −25 to 10 −21 Internal friction … 10 −20 to 10 −15 Magnetic anisotropy … 10 −25 to 10 −21 Source: Ref 5...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
.... Most of the industrial interfaces undergo varying loading conditions ( Fig. 9 ). In addition to the evolution of the coefficient of friction during contact, the contact can also shift from partial to gross slip conditions ( Ref 44 , 50 , 51 ). Therefore, the fretting regime concept was introduced to...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0005586
EISBN: 978-1-62708-170-2
...-plated (steel strip) eV electron volt exp base of the natural logarithm f frequency; friction coefficient; volume fraction F ferrite F load; force FAA Federal Aviation Administration FBC fluidized bed combustion fcc face-centered cubic FCC fluid...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004032
EISBN: 978-1-62708-185-6
... atoms is the relatively weak van der Waals force. Like graphite, MoS 2 has a low friction coefficient, but, unlike graphite, it does not rely on adsorbed vapors or moisture. In fact, adsorbed vapors may actually result in a slight increase in friction ( Fig. 3 ) ( Ref 4 ). MoS 2 also has greater load...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005456
EISBN: 978-1-62708-196-2
... the differential elements yields the following equation: (Eq 1) σ d 2 k = 1 + B B [ 1 − ( t e t o ) B ] where σ d is the drawing stress, k is the shear yield stress, B = μ cot α, μ is the friction coefficient, α is the half-die angle, t...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004013
EISBN: 978-1-62708-185-6
... coefficient of friction, μ. Note that Eq 4 has the same form as Eq 3 , which defines the effective extrusion constant obtained from the deformation energy approach. Calculations of the extrusion pressure for composite billets, described in the following section, show that the constants in Eq 4 obey the...
Book

Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.9781627081887
EISBN: 978-1-62708-188-7