TECHNICAL PAPERS: Heat Transfer in Manufacturing

Numerical Determination of Thermal Contact Resistance for Nonisothermal Forging Processes

[+] Author and Article Information
A.-S. Marchand, M. Raynaud

INSA de Lyon, Centre de Thermique de Lyon, ESA CNRS 5008, Batiment 404, 20, avenue Albert Einstein, 69621 Villeurbanne Cedex, France

J. Heat Transfer 122(4), 776-784 (Feb 15, 2000) (9 pages) doi:10.1115/1.1287168 History: Received February 25, 1999; Revised February 15, 2000
Copyright © 2000 by ASME
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Grahic Jump Location
Thermal contact resistances Rcor and Rth, versus S *  for an asperity height of 10 μm
Grahic Jump Location
Thermal contact model for the Rth estimation
Grahic Jump Location
Thermal contact resistances Rcor and R versus the lubricant conductivities. Condition 1: k1=80 W/m⋅K,k2=60 W/m⋅K,h=7 μm,A=12 deg,VI=65.9 μm. Condition 2: k1=10 W/m⋅K,k2=40 W/m⋅K,h=16 μm,A=9.09 deg,VI=200 μm.
Grahic Jump Location
Thermal contact resistances Rcor and R versus the plastic wave height for h=10 μm,VI=140 μm(A=8.13 deg), kf≈0 W/m⋅K and for different values of k1 and k2
Grahic Jump Location
Example of numerical simulation. k1=400 W/m⋅K,k2=10 W/m⋅K,h=10 μm,h1=9.28 μm,A=20 deg,T∞1=200°C,T∞2=1100°C. (a) Temperature field near the interface without heat generation. (b) Linear extrapolation of the temperature field used to determine the temperature jump at the theoretical interface. Minimal ( * ), maximal (+) and extrapolated temperatures (-----) near the interface. Macroscopic interface temperatures determined at πo=e2 (•) and πo=e2+h (×) locations.
Grahic Jump Location
(a) Example of temperature field near the interface without heat generation. h=10 μm,A=15 deg,k1=20 W/m⋅K,k2=10 W/m⋅K,h1=1.43 μm. (b) Linear extrapolation of the temperature field to determine the temperature jump (Tc1−Tc2) at the theoretical interface.
Grahic Jump Location
Mesh of the microscopic model
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Forging code flow chart
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Real tool roughness: A=4 deg,h=6.4 μm
Grahic Jump Location
Microscopic model of the contact. Note that usually A<15 deg.



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