The interfacial heat transfer coefficient in hot die forging of titanium alloy

1998 ◽  
Vol 212 (6) ◽  
pp. 485-496 ◽  
Author(s):  
Z M Hu ◽  
J W Brooks ◽  
T A Dean
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Titanium Alloy ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Hot Forging ◽  
Element Model ◽  
Interfacial Heat Transfer Coefficient ◽  
Element Analysis

An investigation of die temperature changes and the heat transfer coefficient during hot forging of titanium alloy has been carried out using experiments and a thermal-plastic coupled finite element analysis. Hot Ti-6A1–4V rings were forged between two heated flat dies made of Inconel alloy IN718. The bottom die was instrumented with high-response thermocouples on its surface and subsurface. The recorded temperatures were analysed and used to determine the interface heat transfer coefficient between the die and the workpiece in conjunction with the thermal-plastic coupled finite element analysis using a reverse algorithm. The coefficients determined were then used in a finite element model for the analysis of the upsetting process and the results produced were in good agreement with the experimental data.

Investigation of Heat Transfer and Simulation of Metal Flow in Hot Upsetting

1989 ◽  
Vol 111 (4) ◽  
pp. 337-344 ◽  
Author(s):  
Yong-Taek Im
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Metal Flow ◽  
304 Stainless Steel ◽  
Interface Heat Transfer Coefficient ◽  
Element Analysis ◽  
Interface Heat Transfer ◽  
Interface Heat

An investigation of heat transfer and deformation during hot upsetting has been performed by comparing results of finite element analysis with experimental data obtained from the literature. The effect of the interface heat transfer coefficient for three orders of magnitude has been evaluated in the hot upsetting of AISI 1042 carbon steel, AISI 304 stainless steel, and OFHC copper. The finite element studies have shown to be a practical method to obtain information on the interface heat transfer coefficient, a value that is difficult to determine experimentally. The results for heat transfer in the billets and dies considering transfer time, resting time, and deformation are presented.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Tire Bead Overheating in Urban Buses and Trucks Using Drum Brake Systems

1998 ◽  
Vol 26 (1) ◽  
pp. 51-62
Author(s):  
A. L. A. Costa ◽  
M. Natalini ◽  
M. F. Inglese ◽  
O. A. M. Xavier
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Energy ◽  
Structural Integrity ◽  
Experimental Temperature ◽  
Temperature Profiles ◽  
Element Analysis ◽  
Drum Brake ◽  
Fea Model

Abstract Because the structural integrity of brake systems and tires can be related to the temperature, this work proposes a transient heat transfer finite element analysis (FEA) model to study the overheating in drum brake systems used in trucks and urban buses. To understand the mechanics of overheating, some constructive variants have been modeled regarding the assemblage: brake, rims, and tires. The model simultaneously studies the thermal energy generated by brakes and tires and how the heat is transferred and dissipated by conduction, convection, and radiation. The simulated FEA data and the experimental temperature profiles measured with thermocouples have been compared giving good correlation.

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