David Stevens, Ph.D., P.E. and Matt Barsotti recently attended the 2016 NDIA Ground Vehicle Systems Engineering and Technology Symposium in Novi, Michigan from August 2 to August 4, 2016. David gave a presentation on a new soil model and computational strategy assessment for predicting the loads on armored vehicles, created by a landmine detonation. In addition to advancing the state-of-the-art in modeling shock-loaded soil, the authors investigated the effects of actual test site conditions on the impulse that is applied to the vehicle.
The following is an abstract for their paper titled Modeling of Landmine Loading of Armored Vehicles and Extension to Field Assessment.
Protection Engineering Consultants (PEC) developed a soil model and landmine modeling strategy for LS-DYNA that resulted in excellent agreement with data from carefully controlled, precision tests. A traditional all-ALE approach and a less conventional all-SPH approach were evaluated, as well as hybrid formulations. Regardless of the modeling strategy used, the accuracy of landmine blast load predictions is strongly driven by the fidelity of the soil material model. PEC has developed a sandy soil model specifically for landmine simulations, which requires only two inputs: dry sand density and moisture content. Comparisons with data from two precision test series were exceptionally strong and the average error for predicted impulse was less than 2.5%, using a priori material parameter settings. This approach was employed to study the effects of disturbed soil above the landmine as occurs in live fire tests, where a hole is excavated, the landmine placed and the soil backfilled above the mine.