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friction modeling

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Published: 31 December 2017
Fig. 1 Friction force as a function of normal force in dry forming. Note that for metal forming processes, the Tresca friction model is most appropriate. More
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Published: 31 October 2011
Fig. 5 Simulated displacements of the sonotrode versus time in height direction using different friction models. The external force applied on the sonotrode is 80 N (18 lb). The friction coefficient equation is defined as μ = E / p [ϵ xx ( t ) + ν], where E and ν are the modulus More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006370
EISBN: 978-1-62708-192-4
... asperities in metal forming. It presents advanced tribology models and results for friction in isothermal forging operations in which the tooling is maintained at a temperature close to that of the workpiece. The article provides information on heat transfer models. It discusses the effect of wear...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006385
EISBN: 978-1-62708-192-4
... extrusion finite-element method friction modeling hydrostatic extrusion lubrication modeling reverse extrusion titanium alloys tribology EXTRUSION is a plastic deformation process in which a block of metal called a billet is forced to flow by compression through a die opening of a smaller cross...
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Published: 31 October 2011
Fig. 13 Flow-partitioned zone model showing the flow of material during friction stir welding. Source: Ref 57 More
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Published: 31 December 2017
Fig. 9 Von Mises strain using varying friction and heat transfer models for a ring compression test. (a) 20% reduction in thickness. (b) 80% reduction in thickness More
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
... coefficient heat-transfer coefficient computer simulations oxide scales hot metal ring test thermomechanical processing KNOWLEDGE OF FRICTION AND HEAT TRANSFER is vital to the understanding and operation of metal forming. Modeling and numerical simulations are now extensively used for optimization...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005619
EISBN: 978-1-62708-174-0
... for temperature generation and effect on mechanical properties of welded material. His models were capable of calculating the interface forces that were verified experimentally. Siddiq and Ghassemieh ( Ref 31 , 32 ) studied the changes in the friction work at the weld interface by simulating UW of metals based...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006410
EISBN: 978-1-62708-192-4
... mechanism of friction is applicable to a sliding pair of soft-soft and soft-hard materials. The definition of frictional force as the sum of adhesive force ( F a ) and ploughing force ( F p ) at asperity level on a surface is referred to as the “two-term model,” proposed by Amontons and Coulomb Bowden...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005540
EISBN: 978-1-62708-197-9
... and springback analysis: the type of solution algorithm/governing equation and the type of element. The article provides information on various models for material yield criteria. finite element methods friction sheet metal forming springback analysis SOFTWARE PROGRAMS continue to provide...
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
... h ) Equation 9 shows how the measured flow stress is in excess of the effective or flow stress when friction, and barreling, occur in the test. Extensive finite-element modeling of the hot-compression test using realistic parameters for hot-worked alloys showed that an observed...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005515
EISBN: 978-1-62708-197-9
... Abstract Friction welding is based on the rapid introduction of heat, causing the temperature at the interface to rise sharply and leading to local softening. This article illustrates the basic principles of direct-drive rotational friction welding and inertia friction welding. Modeling...
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 forces (or stresses) are balanced on the differential element, with friction taken as uniform at the tool-slab boundary. This results in a friction hill that is linear for the friction factor model and nonlinear for the coefficient of friction model, with the die pressure increasing from the open...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006361
EISBN: 978-1-62708-192-4
... Models There have been many models proposed for use in calculating coefficients of friction from system properties ( Ref 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ); however, with the exception of the Petrov equation, most are not widely accepted. The Petrov equation suggests that friction...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005519
EISBN: 978-1-62708-197-9
... to the shear flow stress of the chip material. Zorev ( Ref 30 ) proposed a simple stepwise friction model: τ = μ P   where   τ < k and τ = k   where   μ P > k where μ is the coulomb friction coefficient, τ is the friction stress, k is the shear flow stress, and P...