Exploring pulse shaping for Z using graded-density impactors on gas guns (final report for LDRD project 79879).

Furnish, Michael David ; Reinhart, William Dodd ; Anderson, William W. (Los Alamos National Laboratory, Los Alamos, NM) ; Vogler, Tracy John ; Hixson, Rob (Los Alamos National Laboratory, Los Alamos, NM) ; Kipp, Marlin E.

Sandia National Laboratories

关键词: Impact Shock;    Phase Transitions (Statistical Physics);    Density Matrices.;    Compressibility;    36 Materials Science;   

DOI  :  10.2172/876342
RP-ID  :  SAND2005-6210
RP-ID  :  AC04-94AL85000
RP-ID  :  876342

美国|英语

来源: UNT Digital Library

【 摘 要 】

While isentropic compression experiment (ICE) techniques have proved useful in deducing the high-pressure compressibility of a wide range of materials, they have encountered difficulties where large-volume phase transitions exist. The present study sought to apply graded-density impactor methods for producing isentropic loading to planar impact experiments to selected such problems. Cerium was chosen due to its 20% compression between 0.7 and 1.0 GPa. A model was constructed based on limited earlier dynamic data, and applied to the design of a suite of experiments. A capability for handling this material was installed. Two experiments were executed using shock/reload techniques with available samples, loading initially to near the gamma-alpha transition, then reloading. As well, two graded-density impactor experiments were conducted with alumina. A method for interpreting ICE data was developed and validated; this uses a wavelet construction for the ramp wave and includes corrections for the ''diffraction'' of wavelets by releases or reloads reflected from the sample/window interface. Alternate methods for constructing graded-density impactors are discussed.