Evaluation of the Material Point Method within CTH to Model 2-Dimensional Plate Impact Problems
Final rept. 21 May-15 Aug 2014
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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The material point method MPM is a mixed Eulerian and Lagrangian computational method that allows for the discretization of solid bodies into material points carrying the full material state of the original body. This method is being evaluated as a new implementation within CTH, a code originally developed by Sandia National Laboratories, as a way of eventually dealing with fracture and other difficult solid mechanics scenarios. Applying CTH with MPM to a 2-dimensional plate impact problem yields multiple issues that must be examined. Issues with void compression upon initial impact, inhomogeneous particle states within a single cell, and inconsistencies within results obtained at different mesh resolutions are all discussed.