By Joshua Jones, John Roth, Wesley Salandro, Cristina Bunget, Laine Mears
Maximizing reader insights into the newest learn findings and purposes of Electrically-Assisted Forming (EAF) – wherein metals are shaped lower than an electrical present box – this e-book explains how any such method produces fast more desirable formability of metals past the level of thermal softening, and permits metals to be shaped to larger elongation with decrease mechanical power in addition to taking into account light-weight brittle metals similar to magnesium and titanium to be shaped with out exterior heating or annealing, allowing the greater use of those light-weight metals in design.
Including case stories that illustrate and help the theoretical content material and real-world purposes of the recommendations mentioned, this publication additionally serves to complement readers figuring out of the underlying theories that effect electro-plastic behaviour.
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Additional info for Electrically Assisted Forming
Example text
It can be defined by the ratio of the strain in the width direction to the strain in the thickness direction. Thus, it is desirable to have a higher r value so that the material will be more resistive to thinning and delay material failure. The normal anisotropy relates to formability as the resistance to thinning is critical in sheet forming as the material fails from local thinning (necking). 2 Limiting Dome Height The limiting dome height (LDH) is a measure of formability of sheet metal in that it collectively quantifies parameters such as the n-value, the m-value, and achievable elongation.
Research by McNeal et al. [19] examined microstructural alterations in the same Mg AZ31B-O tensile specimens. Green et al. [20] determined that springback in Al 6111 sheet specimens could be completely eliminated with a single high-current, short-duration electrical pulse. From work by Jones and Roth [21], achievable compressive displacements of the same Mg alloy were increased by over 400 %, and the electricity even led to strain weakening effects. Additionally, in 2009, Salandro and Roth [22] found that, by applying electric pulses to Al 5052 while undergoing highly localized channel formation, the achievable channel depth could be increased while reducing the required machine forces.
Moreover, in 2009, Salandro et al. [18] discovered a linear relationship between current density and pulse duration in Mg AZ31B-O tensile specimens that could be used to reliably achieve intended elongations for a variety of pulsing conditions. Research by McNeal et al. [19] examined microstructural alterations in the same Mg AZ31B-O tensile specimens. Green et al. [20] determined that springback in Al 6111 sheet specimens could be completely eliminated with a single high-current, short-duration electrical pulse.