Assessing mesoscale material response under shock & isentropic compression via high-resolution line-imaging VISAR.

Hall, Clint Allen ; Furnish, Michael David ; Podsednik, Jason W. ; Reinhart, William Dodd ; Trott, Wayne Merle ; Mason, Joshua

Sandia National Laboratories

关键词: Copper;    Compression;    Welded Joints;    36 Materials Science;    Tantalum;   

DOI  :  10.2172/918308
RP-ID  :  SAND2003-3689
RP-ID  :  AC04-94AL85000
RP-ID  :  918308

美国|英语

来源: UNT Digital Library

【 摘 要 】

Of special promise for providing dynamic mesoscale response data is the line-imaging VISAR, an instrument for providing spatially resolved velocity histories in dynamic experiments. We have prepared two line-imaging VISAR systems capable of spatial resolution in the 10-20 micron range, at the Z and STAR facilities. We have applied this instrument to selected experiments on a compressed gas gun, chosen to provide initial data for several problems of interest, including: (1) pore-collapse in copper (two variations: 70 micron diameter hole in single-crystal copper) and (2) response of a welded joint in dissimilar materials (Ta, Nb) to ramp loading relative to that of a compression joint. The instrument is capable of resolving details such as the volume and collapse history of a collapsing isolated pore.