HUGOFIT and HUGOPLOT: Computer codes for plane shock wave analysis with materials that have non-simple Hugoniots

Technical Report · Thu Jan 25 00:00:00 EST 1990

OSTI ID:6939160

Gathers, G R

These two codes were written to accomodate plane shock wave data analysis and prediction for materials which are not adequately described by a simple linear u{sub s}-u{sub p} Hugoniot fit. As an example, kapton is a common flyer used in electric guns and falls into the above class of materials. The best tabulated data for its Hugoniot known to the author is that of Marsh (polyimide). The best fit can be obtained using a series of linear segments in the u{sub s}-u{sub p} plane. This is characteristic of materials that undergo phase changes on the Hugoniot. A substantial database for the EOS (equation of state) of many materials also exists at LLNL. The HUGOFIT code was written so that Hugoniots from that database (after conversion of units) could be readily fitted. The EOP library results are available on the mainframe computers at LLNL and the availability of graphics on these machines (and absence of graphics on the author's PC) made it simplest to write the codes for use on the mainframes. An added advantage is the ability to put out hardcopy to either fiche or RJET. The codes are written for the CRAY-1, but there is no intrinsic reason the codes cannot be adapted to a PC, and this is currently being done. One can also readily use tables of experimental data. The data to be fitted is entered from a file on disk called DATA. All other input is made from the teletype. The units for velocity were chosen to be km/sec since that is what the EOP library users. Densities are in g/cm{sup 3} and pressures are in megabars.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6939160
• Report Number(s): UCRL-ID-103346; ON: DE90010284
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
H CODES
SHOCK WAVES
DATA ANALYSIS
EQUATIONS OF STATE
LEAST SQUARE FIT
PHASE TRANSFORMATIONS
COMPUTER CODES
EQUATIONS
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
657002* - Theoretical & Mathematical Physics- Classical & Quantum Mechanics
990200 - Mathematics & Computers