61 / 2023-04-11 22:08:02

Metal Dynamic Behavior under Magnetically - Driven Ramp - wave Loading on Pulsed Power Facility

高压物理与材料科学 > 动高压-海报

     Under shock loading , metals typically increase in strength with shock pressure initially but at higher stresses will eventually soften due to thermal effects . Under isentropic loading , thermal effects are minimized , so strength should rise to much higher levels . A new loading technique to generate uniform , planar compression waves using the pulsed power accelerator has enabled quasi - isentropic compressibility to multimegabar pressure of condensed matter , and thus it is named Isentropic Compression  Experiment ( ICE ) technique .

    The Primary Test Stand is a multi - terawatt pulsed power facility , consisting of 24 modules connected in parallel . A pulse of electrical current , typically 4-8 MA in magnitude and having 230--750 ns rise time , is delivered to the central target . When the current flows over parallel anode and cathode plates , it will generate a large magnetic field density between them . The interaction of the current and magnetic field results in a large Lorentz force and results in a magnetic pressure wave in the circuit materials . To date , we have developed and improved a series of design methods for different purpose , such as measuring the EOS data , monitoring the phase transition , obtaining the strength properties . The use of unsteady ramped compression waves to measure material response allows for accurate , high - pressure measurements under dynamic conditions on a time scale similar to shock methods , but at temperatures much closer to static methods .

    The next generation ultra strong pulsed power facility that is about to start construction will have an output current exceeding 50MA. User experimental station will be built for material dynamics properties research simultaneously . Driven by this unprecedented ultra strong pulse current , the pressure range that can be studied can reach TPa level , which will greatly enhance the research ability .