Development and Validation of EPH Material Model for Engineered Roadway Soil
ALTAIR ENGINEERING INC TROY MI
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Full-vehicle, End-to-End under-body blastUBB simulations with LS-DYNA have been common practice at the Tank Automotive Research, Development and Engineering Center TARDEC for the last several years to support Program Managers in the Army Acquisition of military ground vehicles. Soil, which is one of the four key components with air, charge, and vehicle structure being the others, has been represented in these simulations by an Elastic-Plastic Hydrodynamic EPH2 model. EPH models has been available for the currently used Double-Sifted DS Topsoil since 2012, but not yet developed for a proposed Engineered Roadway Soil ERS. This study describes a systematic method where EPH model fits were developed based on material characterization tests, and then validated against physical tests with two different types of large flat plates. The accuracy of this model has been shown in nine different comparisons of plate velocity impulse or deformation to be well within 11.3. This model is therefore deemed to be accurate enough and acceptable for usage of UBB simulations in the Army.
- Soil Mechanics
- Land Mine Warfare