Faster Method of Simulating Military Vehicles Exposed to Fragmenting Underbody IED Threats

Paper #:
  • 2017-01-0264

  • 2017-03-28
In this paper, the capability of three methods of modelling detonation of high explosives (HE) buried in soil viz., (1) coupled discrete element & particle gas methods (DEM-PGM) (2) Structured - Arbitrary Lagrangian-Eulerian (S-ALE), and (3) Arbitrary Lagrangian-Eulerian (ALE),are investigated. The ALE method of modeling the effects of buried charges in soil is well known and widely used in blast simulations today Due to high computational costs, inconsistent robustness and long run times, alternate modeling methods such as Smoothed Particle Hydrodynamics (SPH) and DEM are gaining more traction. In all these methods, accuracy of the analysis relies not only on the fidelity of the soil and high explosive models but also on the robustness of fluid-structure interaction. These high-fidelity models are also useful in generating fast running models (FRM) useful for rapid generation of blast simulation results of acceptable accuracy. The main focus of this study is to understand the limitations & strengths of DEM-PGM and S-ALE methods compared to the widely used traditional ALE method. S-ALE method reduces the computational time 45% compared to ALE and DEM-PGM method also reduces computational time 40% compared to ALE and has the ability to capture fragmentation and its secondary effects on soldiers and interior structures. Improvised Explosive Devices (IED) are a major threat to military vehicles on mission and detonation of these IED cause from minor vehicle damage to catastrophic failures and significant injuries to soldiers inside the vehicles. To mitigate the high blast energies away from vehicles today's military vehicles are equipped with blast mitigating shapes such as V-Hull, Double V-Hull, and stroking floors, and seats to reduce vertical accelerative loads experienced by soldiers. Design, test and verify approach to identify these technologies may be costly during the development stages of analysis of alternatives (AOA). End to end full system M&S will significantly help the AOA during the development stages and throughout the life cycle of the program. Energetics effects and crew safety (EECS) simulation team of U.S Army' TARDEC ANALYTCS is a leader in end to end simulation of full system military ground vehicles. EECS team has developed full system light, medium and heavy combat vehicles models with full suite of soldiers both on wheeled and tracked vehicles platforms, correlated and predicted structural and soldier injury responses. With the development of the DEM-PGM and S-ALE methods, predicting the effect of secondary impact of fragmenting objects in addition to the existing capabilities will be a significant value added to the military ground vehicle programs.
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