The Reduction of Deformation Energy and Increase in Workability of Metals Through an Applied Electric Current

Perkins, Timothy A.; Roth, Joseph

doi:10.1115/imece2005-81060

Cited by 3 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, research on EPE has become increasingly popular [3][4][5][6] since this effect has found applications in various industries. Due to the skin effect [7], a non-thermal reduction in flow stress can be observed in relatively thin workpieces in such manufacturing processes as drawing [8,9], rolling [10,11], stamping [12], forging [13,14], cutting [15], and forming [5,6,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Repetitive High-Density Current Pulses on Plastic Deformation of Copper Wires under Stepwise Loading

Dmitriev,

Morkina,

Tarov

et al. 2024

Spec. Mech. Eng. Oper. Res.

View full text Add to dashboard Cite

High-density electric current pulses increase the plasticity and reduce the yield stress of metals with negligible heat generation. This effect has great potential for the development of energy-saving technologies for processing hard-to-deform metallic materials. Despite the long history of the study of electroplasticity, there is still no consensus on the physical nature of this effect. In this paper, the effect of repetitive pulses applied at the same or gradually increasing tensile stress on the plastic deformation of copper wire is investigated using a home-made experimental setup. The electroplasticity of the wire in the delivery state and after annealing is compared. It is shown that for a constant tensile stress, the incremental plastic deformation of the wire decreases with each successive pulse. This effect is stronger for annealed wires because they have a lower dislocation density and therefore a lower plasticity resource. The Joule heat release in the specimen and the heating due to plastic deformation are evaluated. The results obtained will be used to fit the parameters of the atomistic model being developed to describe the interaction of electron flow with dislocations.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Repetitive High-Density Current Pulses on Plastic Deformation of Copper Wires under Stepwise Loading

Dmitriev,

Morkina,

Tarov

et al. 2024

Spec. Mech. Eng. Oper. Res.

View full text Add to dashboard Cite

show abstract

Compressive Superplastic Behavior of 6Al-4V Titanium Caused by an Applied DC Current

Kronenberger

Warner

Roth

2006

Materials, Nondestructive Evaluation, and Pressure Vessels and Piping

View full text Add to dashboard Cite

Recent research has shown that the flow stress necessary to deform certain metallic materials can be decreased when an electrical current is present in the material while undergoing deformation. As part of this testing, it was found that, under higher current densities, the various metals began to exhibit strain weakening and superplastic behavior (i.e., the stress either remained constant or decreased as the strain increased). During typical compression testing, it is expected that the stress will continually increase as the strain increases. This is due to the increase in the cross-sectional area of the test specimen as well as the frictional effects that are present between the specimen and the fixture throughout the test. Since this strain weakening and subsequent superplastic behavior is opposite of what typically occurs during normal low temperature compression tests, it introduces a new electrical current-related phenomenon. This paper contains a detailed investigation of superplastic behavior using experimental results, focusing on 6A1-4V Titanium in particular. To examine this phenomenon, compression tests are run at different current densities. Some tests are conducted with the electricity present the entire time, while other tests are conducted with the electricity turned off at various points within the superplastic region. Still other tests have a pulsed electrical current present. It will be shown that the superplastic behavior allows significant increases in total deformation to be achieved using extremely low forces.

show abstract

Electrically Assisted Global Springback Elimination After Single Point Incremental Forming

Neveux

Ruszkiewicz

Grimm

et al. 2016

Volume 1: Processing

View full text Add to dashboard Cite

There has been a push in the automotive and aerospace industries towards die-less forming processing that are able to reduce both part cost and part energy. Incremental forming is a die-less forming process that fabricates parts using hemispherical tools following a tool path (similar to that found with conventional milling operations), that slowly deforms the sheet metal into the final desired configuration. Global springback for incremental forming, as defined herein, occurs after the part is unclamped from the retaining fixture. This form of springback is currently a significant impediment to the process since, when the part is released, the residual stresses created during the forming process result in significant part distortion and thereby, undesirable part geometries. To reduce this issue, this paper examines the effect on direct electric current on residual stress and springback elimination when applied post forming, which previous work has shown the potential to reduce this issue. This work is an extension of previous work resented at MSEC 2015. The previous work examined applying electric current to areas of high residual stress through the material’s thickness. This work examines the effect of applying electric current along the length and width of a part (path testing). This work concludes that running multiple paths increases springback reduction and the order in which the path testing is conducted has very little appreciable effect on the springback reduction during path testing.

show abstract

The Reduction of Deformation Energy and Increase in Workability of Metals Through an Applied Electric Current

Cited by 3 publications

References 7 publications

Effect of Repetitive High-Density Current Pulses on Plastic Deformation of Copper Wires under Stepwise Loading

Effect of Repetitive High-Density Current Pulses on Plastic Deformation of Copper Wires under Stepwise Loading

Compressive Superplastic Behavior of 6Al-4V Titanium Caused by an Applied DC Current

Electrically Assisted Global Springback Elimination After Single Point Incremental Forming

Contact Info

Product

Resources

About