Three-Dimensional Modeling of Nuclear Explosions Using a Micro-Mechanical Damage Model
[Technical Report, Interim Report]
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We have implemented the latest version of the micro-mechanical damage model developed by Dr. Charles Sammis and associates in a Fortran 90 module that can be incorporated into a 1D, 2D or 3D code. We have added the module to our 1D spherically symmetric nonlinear finite difference code SKIPPER and our 3D finite element code CRAM3D. During the first year of this project we performed an extensive set of calculations using the 1D code, and compared the results with near-field data from US and former Soviet Union underground nuclear explosions. The new model gives a better data fit to the Degelen data than the quasistatic damage model used in Stevens et al 2003, and also gives a fairly good data fit to the Piledriver data without changing any parameters. The results of the calculations will define the physical models and parameters that will be used in year 2 in the 3D code.