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friction test parameter

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040083
EISBN: 978-1-62708-300-3
... to evaluate the coefficients in the friction and flow stress model for metal forming processes. He identified parameters in the conventional flow stress equation and in a dislocation density based internal variable model as well as friction factor from one set of ring compression test. He concluded...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040067
EISBN: 978-1-62708-300-3
... Abstract This chapter discusses the effect of friction and lubrication on forgings and forging operations. The discussion covers lubrication mechanisms, the use of friction laws, tooling and process parameters, and the lubrication requirements of specific materials and forging processes...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300047
EISBN: 978-1-62708-323-2
... (as most do), then the user must input a coefficient of friction for the rubbing surfaces; often that parameter is not known. Simulation tests must be run to arrive at a plausible number or the FEM analyst must guess. Such guesses can be significantly different from the real case. The most widely used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040237
EISBN: 978-1-62708-300-3
..., and microstructure, as well as friction characteristics at the interface. Other inputs required are the geometric parameters of the objects and the process parameters. Several issues, such as material properties, geometry representation, computation time, and remeshing capability, must be considered in cost...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500051
EISBN: 978-1-62708-317-1
... the modeling of a material even more difficult. Thus, in addition to the simulation capability, it is necessary to have standard test methods for determining the important input parameters, such as mechanical properties of the material and interface friction conditions ( Ref 3.5 ). Geometry (CAD Model...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780259
EISBN: 978-1-62708-281-5
... Abstract This article focuses on friction and wear as they relate to polymeric materials, covering friction and wear applications for polymeric materials. The discussion covers the causes and mechanisms of friction, wear, and lubrication; different test methods developed to simulate friction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400105
EISBN: 978-1-62708-316-4
... Table 8.5 Process parameters Coefficient of friction, μ 0.07–0.09 Blank holder force, BHF 50 tons Test speed 15 mm/sec Source: Ref 8.15 Fig. 8.16 Tool geometry used in the finite element simulations and experiments. Source: Ref 8.15 Prediction of Stress and Strain...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390145
EISBN: 978-1-62708-459-8
..., friction forces, and stress and strain distributions. It explains how to measure temperature between tooling and workpiece surfaces as well as surface topography and composition, film thickness, and wear. It also discusses the benefits of reduced-scale and simulation testing and the transfer of results...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400089
EISBN: 978-1-62708-316-4
... stamping, deep drawing, ironing, and blanking operations. blanking friction lubricants stamping tribological test FRICTION AND LUBRICATION in sheet metal forming are influenced by such parameters as material properties, surface finish, temperature, sliding velocity, contact pressure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500133
EISBN: 978-1-62708-317-1
... on the cooling rate. At 500 °C (930 °F), bainite formation caused an increase of flow stress at the lower cooling rate of 15 K/s. Fig. 7.9 Influence of cooling rate. Source: Ref 7.9 Friction Coefficient The friction coefficient is an important parameter for calculating accurate material flow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040193
EISBN: 978-1-62708-300-3
... the process due to changes in the lubricant and the temperature at the die/workpiece interface. In such applications, the double cup extrusion test is recommended for estimation of the friction factor, as discussed in Chapter 7, “Friction and Lubrication.” 16.3.5 Material Parameters The closed-die...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350043
EISBN: 978-1-62708-315-7
... of engineering materials and coatings. It also describes the causes and effects of the most common forms of wear, the conditions under which they occur, the role of lubrication, and wear testing methods. friction coefficient lubrication wear wear testing FRICTION, WEAR, AND LUBRICATION are complex...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300121
EISBN: 978-1-62708-323-2
... Abstract This chapter discusses the processes and procedures involved in tribotesting, the significance of test parameters and conditions, and practical considerations including test metrics and measurements and the interpretation of wear damage. It also describes the different types of erosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610263
EISBN: 978-1-62708-303-4
... where fatigue failures are likely to occur in cold-driven rivet and friction joints, and why the fatigue strength of welded joints can be much lower than that of the parent metal, depending on weld shape, joint geometry, discontinuities, and residual stresses. The chapter also explains how to improve...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390325
EISBN: 978-1-62708-459-8
... coefficient at the onset of yielding. To do so, the test must be repeated at several reductions and the results extrapolated to zero reduction. Of course, the extrapolation is invalidated if the lubrication mechanism changes during compression. The frictional drag can be modeled also by m or a mixture of m...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500179
EISBN: 978-1-62708-317-1
... can also be used to quantify the formability of the tube. In the cone expansion test ( Fig. 9.5c ), a tube is bulged at the end of the tube using a conical punch until fracture. The cone geometry obtained is a measure of tube formability. However, because friction is present at the cone-tube interface...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300301
EISBN: 978-1-62708-323-2
... of friction for plastic versus steel tribosystems (from various plastics manufacturers’ catalogs). PTFE, polytetrafluoroethylene Friction and wear are stochastic processes. Different friction and wear events can happen in every rubbing situation. Many repeat tests are needed to address this issue...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390389
EISBN: 978-1-62708-459-8
... parameters from the force-displacement curve in the LDH test by relating the rate of change of force to the diameter of contact radius. In general, interface pressures are only fractions of σ f unless μ becomes high. Examples of experimentally determined friction coefficients are given in Table 12.1...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300421
EISBN: 978-1-62708-323-2
... of wear or erosion apply to a tribosystem? Name six “must” parameters that must be considered and analyzed in any tribosystem. How do you identify tests that apply to a tribosystem? How do you determine friction limitations in a tribosystem? Can you name four types of possible contact motion...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.9781627083232
EISBN: 978-1-62708-323-2