Electrically driven plasma via vaporization of metallic conductors: A tool for impulse metal working

Experimental and Numerical Analysis of the Influence of Burst Pressure Distribution on Rapid Free Sheet Forming by Vaporizing Foil Actuators

“…This is ongoing research, though. Both models may be coupled by Equation (1) so that the result of the first modeling stage (energy distribution) serves as initial value for the second one (burst pressure distribution). A simplified analytical approach for the electrical model part was also introduced [11].…”

“…Aside from other manufacturing applications (e.g., see Vivek et al [1] for a comprehensive overview), electrically exploding thin metal conductors can be used to flexibly form sheet metal blanks into a die cavity. The violently expanding vapor pressure acts as forming pressure in this impulse-based process, which is called Vaporizing Foil Actuator Forming (VFAF, Figure 1).…”

“…Moreover, one can make use of the pressure on both sides of the foil to form two sheets at the same time [8]. Grigoriev and Pavlenko [9] experimentally found the relatively universal Equation (1) to relate the specific electrical energy deposition w (MJ/kg) into the foil until the burst to the burst pressure amplitude p b (h b is the Metals 2020, 10, 845 2 of 12 latent heat of vaporization of a metal (MJ/kg)) after which a very fast quasi-exponential decay can be observed due to the rapid volume expansion of the actuator. Equation (1) clearly shows that the specific achievable resistive energy deposition determines the burst pressure p b , as h b is a material constant.…”

“…Equation (1) clearly shows that the specific achievable resistive energy deposition determines the burst pressure pb, as hb is a material constant. Besides experimental research, modeling is key as well to a proper process development or design.…”

Openable electromagnetic actuator as a non-contact, agile tool for crimping operations

“…In many applications, impulse processed components exhibit desirable properties such as reduced springback, shock hardening, better dimensional tolerances, and smaller burrs in sheared workpieces [1]. The various types of impulse forming include explosive [2], pulsed laser [3], vaporizing foil actuator [4], electrohydraulic [5], and electromagnetic [6]. Electromagnetic forming (EMF) is based on the principles of Faraday's law of induction and Lorentz forces.…”