Determination of Dynamic Mechanical Properties from Explosively Driven Rings
The expanding ring test is employed as a method of screening metals for shaped charge liners. The dynamic elongation of the liner metal at high strain rate (∿104 sec−1) is found from the maximum elongation prior to rupture as determined from the voltage induced in a pickup coil by an expanding ring which is explosively driven in a magnetic field. The ring radii at various times as well as the mode of rapture are found from flash x-ray radiographs. The dynamics of the ring is analyzed by a two dimensional Hydro-Plasto-Dynamic code. The pickup coil signal is calculated from an analytical solution of an air core transformer, the primary of which is the ring with time dependent radius.
KeywordsHigh Strain Rate Maximum Elongation Pickup Coil Tungsten Alloy Ring Radius
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