42.3 Conclusion We presented a brief overview and technical update of our ONR MURI project on soil blast modeling and simulation. Remaining work includes obtaining repeatable experimental data for homogeneous soils (Boulder clay and Mason sand), inhomogeneous soils (mix of Boulder clay and Mason sand), and layered soils in the geotechnical centrifuge buried explosive experiments, development and testing of Scale I coupled DE-SPH-RKPM-FEM-BEM-CFD code against small scale experimental results, hierarchical coupling between Scale I (mesoscale, or grain-scale, of soil) and Scale II (macroscale continuum modeling) and further modification of Scale II modeling based on upscaling and macroscale experimental data, Synchrotron X-ray CT characterization of mesoscale structure of soil in centrifuge tests (before and after explosive loading), Fig. 42.14 (Left-top) Scale I (zoom in of explosive region): concurrent computational multiscale, multiphase failure mechanics of soil under buried explosive loading. (Bottom) Overlap coupling between 1D string of 11 DEs, and 4 micropolar FEs. (Left-middle and right) Axial displacement, transverse displacement, and rotational degrees of freedom showing scaled and not-scaled energy in the overlap region. The transverse displacement is coupled to the rotational dofs, thus there is a jog in the transition, as the rotational dofs from the DE and FE are significantly different (an artifact of the 1D DE string example, expected to reduce for 2D and 3D overlap coupling implementations) 352 R. Regueiro et al.
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