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Technical Briefs

Several Factors Affecting the Electroplastic Effect During an Electrically-Assisted Forming Process

[+] Author and Article Information
Wesley A. Salandro, Cristina J. Bunget, Laine Mears

 International Center for Automotive Research, Clemson University, Greenville, SC 29607

J. Manuf. Sci. Eng 133(6), 064503 (Dec 22, 2011) (5 pages) doi:10.1115/1.4004950 History: Received April 01, 2011; Revised August 22, 2011; Published December 22, 2011; Online December 22, 2011

Recent development of electrically-assisted manufacturing (EAM) processes proved the advantages of using the electric current, mainly related with the decrease in the mechanical forming load and improvement in the formability. From EAM experiments, it has been determined that a portion of the applied electrical power contributes toward these forming benefits and the rest is dissipated into heat, defined as the electroplastic effect. The objective of this work is to experimentally investigate several factors that affect the electroplastic effect and the efficiency of the applied electricity. Specifically, the effects of various levels of cold work and contact force are explored on both Grade 2 and Grade 5 Titanium alloys. Thermal and mechanical data prove that these factors notably affect the efficiency of the applied electricity during an electrically-assisted forming (EAF) process.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of an EAF test setup [2]

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Figure 2

Experimental test setup

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Figure 3

Specimen preparation procedure

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Figure 4

Flow stress reduction due to EAF (G2)

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Figure 5

Flow stress reduction due to EAF (G5)

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Figure 6

EAF formability improvement (Ti-G5)

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Figure 7

Heating and cooling sequence during a stationary electrical test

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Figure 8

Temperature profiles for G2

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Figure 9

Stationary test at L2 (G2)

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Figure 10

Stress–strain profiles from L1 to L2 (G2)

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Figure 11

Contact force effect on temperature (G2)

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