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RESEARCH PAPERS

Global Analysis Method of Friction Parameters in Strip-Drawing Tests

[+] Author and Article Information
J.-M. Pothier

 Laboratoire de Microanalyse des Surfaces, 26 chemin de l’Epitaphe, ENSMM, 25030 Besançon, France; Laboratoire de Chimie des Matériaux et Interfaces, Université Franche-Comté, IUT, 30 Avenue de l’Observatoire, 25009 Besançon Cedex, France; and Laboratoire d’Automatique de Grenoble, rue de la Houille Blanche ENSIEG, 38 042 St. Martin d’Hères, France

X. Roizard1

 Laboratoire de Microanalyse des Surfaces, 26 chemin de l’Epitaphe, ENSMM, 25030 Besançon, Francexavier.roizard@ens2m.fr

J. Y. Hihn

 Laboratoire de Chimie des Matériaux et Interfaces, Université Franche-Comté, IUT, 30 Avenue de l’Observatoire, 25009 Besançon Cedex, France

J.-F. Béteau

 Laboratoire d’Automatique de Grenoble, rue de la Houille Blanche ENSIEG, 38 042 St. Martin d’Hères, France

G. Monteil

 Laboratoire de Microanalyse des Surfaces, 26 chemin de l’Epitaphe, ENSMM, 25030 Besançon, France

1

Corresponding author.

J. Tribol 128(2), 414-421 (Nov 21, 2005) (8 pages) doi:10.1115/1.2162919 History: Received July 12, 2005; Revised November 21, 2005

Numerous works have been recently carried out to describe friction and lubrication in the tool-sheet interface. This phenomenon is of great importance for all forming processes, particularly, in the deep drawing operations where the rapid progress in the field of computing requires the predictive knowledge of friction coefficient behaviors. The present paper considers the dynamical modeling by a global approach of the tangential force evolution. All measurements come from a tribometer equipped for strip-drawing tests on lubricated steel sheets and aluminum sheets, as a function of applied normal load. Models are obtained from serial, parallel, or closed-loop association structures for linear transfer functions. Numerical values of delays, time constants, and gain are identified for each test order; complexities and structures are determined with a double optimization. For all situations, a stop criterion is defined to achieve the optimal model, which is reached for the steel sheets.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 2

Experimental device

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Figure 6

Variation of error versus complexity, AL and XS tests

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Figure 1

Speed accommodation model

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Figure 3

Example of simultaneous recordings during a strip drawing test (AL3000)

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Figure 4

Principle of the model-matching method

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Figure 5

Identifications with increasing complexity for AL 4000

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Figure 9

Variation of parameters for closed-loop structure

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Figure 10

Variation of delay time versus normal force

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Figure 7

Conceivable structures for the 2d model

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Figure 8

Variation of parameters for global structure

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