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TECHNICAL PAPERS

Optimization of Thermomechanical Loading by the Inverse Method

[+] Author and Article Information
Virginie Bogard

Laboratoire d’Analyse des Contraintes Mécaniques, Université de Reims Champagne-Ardenne, I.U.T Léonard de Vinci, Rue des Crayères, BP1035, 51687 Reims Cedex 2, Francevirginie.bogard@univ-reims.fr

Philippe Revel, Yannick Hetet

Laboratoire Roberval (FRE 2833 CNRS), Département de Génie des Systèmes Mécaniques, Université de Technologie de Compiègne, Centre de Recherches de Royallieu (P.G), BP-649, 60206 Compiègne cedex, France

εt=εe+εpεvp+εth, where εe is the elastic strain, εp is the plastic strain, εvp is the viscoplastic strain, and εth is the thermal strain.

J. Eng. Mater. Technol 129(2), 207-210 (Jun 26, 2006) (4 pages) doi:10.1115/1.2400255 History: Received September 11, 2003; Revised June 26, 2006

This study presents 2D experimental results and the numerical simulations of thermal loads in order to observe their influences on the life of mechanical systems. The experimental and thermal evolution was measured using several thermocouples and an infrared pyrometer. In fact, the thermal loading was determined by the resolution of an inverse process where the parameters of thermal laws were identified by minimizing the difference between the experimental results and the numerical simulations. After this optimization process, the mechanical modeling by the finite element method was carried out by applying the optimized thermal loading. The laws of elastoviscoplastic behavior are applied in the working temperature range of a continuous casting rollers tool. This modeling constitutes a technological means to choose a type of a coating material and its optimum thickness and to test different thermal loads in order to optimize the industrial process and to improve the tool’s life.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of applied thermal load for the air quenching test

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Figure 2

Schematic representation of the Jominy test setup

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Figure 3

Locations of thermocouples

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Figure 4

(a) Thermal boundary conditions (air quenching). (b) Thermal boundary conditions (Jominy test).

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Figure 6

Scheme of the numerical process

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Figure 7

Comparison of model-experiment for thermocouple located at 2mm

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Figure 8

(a) Evolution of heat transfer coefficients for the Jominy test. (b) Evolution of heat transfer coefficients for the air quenching test.

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Figure 9

Evolution of von Mises stress versus time

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