NDLI: Design and optimization of MAPS experiments on Sandia's Z machine

Content Provider	IEEE Xplore Digital Library
Author	Haill, T.A. Alexander, C.S. Dalton, D.G. Rovang, D.C. Lamppa, D.C.
Copyright Year	2013
Description	Author affiliation: Sandia Nat. Labs., Albuquerque, NM, USA (Haill, T.A.; Alexander, C.S.; Dalton, D.G.; Rovang, D.C.; Lamppa, D.C.)
Abstract	Summary form only given. Magnetically-applied pressure-shear (MAPS) is a recently developed technique to directly measure material shear strength using magnetohydrodynamic (MHD) pulsed power $platforms^{1,2}.$ The method has been prototyped on Sandia's Veloce pulser, but was limited to strength measurements at modest pressures of ~10 GPa. Our present aim is to develop MAPS into a robust technique to measure strength at higher pressure achievable on Sandia's Z pulsed power machine.By applying an external static magnetic field to a tri-layer driver/sample/anvil region, the MHD drive directly induces a shear stress wave in addition to the usual longitudinal stress wave. The longitudinal and shear deviatoric stresses are coupled through a von Mises yield criterion, hence the transmissible shear wave at a given pressure is limited by the sample material strength. The transmitted pressure and shear are directly related to the measured free surface velocities of the anvil which are measured using a transverse VISAR diagnostic. Complex wave interactions among forward and reflected longitudinal and shear waves, the advancing magnetic diffusion front of the MHD drive, the shape of the current drive, as well as the applied magnetic field strength and uniformity, can make the design of the experiments complex. This paper will present the design and optimization of MAPS experiments to be fielded on Z. The MAPS experiments are modeled using Sandia's ALEGRA MHD code. We will detail the numerical investigations into MHD shear generation, longitudinal and shear wave coupling, timing of the wave interactions, and transmission of shear at material interfaces.
Starting Page	1
Ending Page	1
File Size	114795
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6635062
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetohydrodynamics Magnetic field measurement Magnetomechanical effects Pressure measurement Laboratories Pulse measurements Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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