Three-Dimensional Modeling of Nuclear Explosions Using a Micro-Mechanical Damage Model
Abstract
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. 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 were used to define the physical models and parameters used in the 3D code. We performed a large number of three-dimensional nonlinear calculations of explosions with the micromechanical damage model in regions with flat surfaces and with strong topography. We find that the initial P-wave is insensitive to micromechanical damage, but the later part of the P-wave and SV and SH waves can be affected substantially by damage, particularly in the presence of topography. Surface waves are affected by damage in complex ways, particularly in regions of topography. In brief, micromechanical damage in a flat topography reduces surface waves while micromechanical damage in a region with topography may either enhance or reduce surface waves depending on the location of the explosion relative to the surface.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 15, 2021
- Accession Number
- AD1164852
Entities
People
- Charles G. Sammis
- Jeffry L. Stevens
- Michael H P O'Brien
Organizations
- Leidos