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Research Papers

Coupled Multifield Finite Element Analysis Model of Upsetting Under an Applied Direct Current

[+] Author and Article Information
Thomas J. Kronenberger, David H. Johnson, John T. Roth

School of Engineering, Mechanical Engineering, Penn State Erie, The Behrend College, Erie, PA 16563

J. Manuf. Sci. Eng 131(3), 031003 (Apr 21, 2009) (8 pages) doi:10.1115/1.3090833 History: Received July 30, 2007; Revised July 21, 2008; Published April 21, 2009

Recent research studying the deformation of various metals in compression, while running an electric current through the material, has been quite promising. A problem occurs when trying to identify the specific mechanisms that cause the changes in the mechanical properties, however, since the flow of electricity produces resistive heating, which also affects the mechanical properties of metals. However, previous research has proven that not all of the effects on the properties can be explained through resistive heating, implying that the electron flow through the metal also causes changes to the mechanical properties. Therefore, this work develops a model capable of differentiating between the effects of resistive heating and the effects of the electron flow when deforming 6061-T6511 aluminum in compression. To accomplish this, a detailed finite element simulation has been developed using ANSYS ® with two models in symbiosis. The first model predicts the temperature of the specimen and compression fixtures due to the applied electrical current. The resulting thermal data are then input into a deformation model to observe how the temperature change affects the deformation characteristics of the material. From this model, temperature profiles for the specimen are developed along with true stress versus strain plots. These theoretical data are then compared with experimentally determined data collected for 6061-T6511 aluminum in compression. By knowing the exact effects of resistive heating, as obtained through the finite element analysis (FEA) model, the effects of the electron flow are isolated by subtracting out the effects of resistive heating from the data obtained experimentally. Future work will use these results to develop a new material behavior model that will incorporate both the resistive and flow effects from the electricity.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Stress-strain input for aluminum specimen

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Figure 3

Thermal conductivity and specific heat versus temperature

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Figure 4

Resistivity and thermal expansion versus temperature of 6061-T6511 aluminum

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Figure 5

Electrical boundary conditions

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Figure 7

Physical test setup

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60 A/mm2 temperature profiles

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45 A/mm2 temperature profiles

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Stress-strain baseline comparison

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Figure 11

Isothermal test and model compared

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Figure 12

Stress versus strain plot 60 A/mm2 test

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Figure 13

Stress versus strain plot 45 A/mm2 test

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Figure 14

Current density vectors at test beginning

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Figure 15

Current density vectors at test end (20 s)

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Figure 16

Final temperature profile

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FE model geometry and boundary conditions

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Figure 6

Schematic of test setup

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