Simulating Underbelly Blast Events using Abaqus/Explicit - CEL.

摘要

Accurate modeling and simulation of the effects of near-field blast events on vehicles and personnel is of interest to the Department of Defense. Applications include minimizing casualties and improving vehicle survivability from attacks using improvised explosive devices. The coupled Eulerian- Lagrangian (CEL) capability in Abaqus/Explicit was used to replicate experimental tests in which the structural response of varying metal panels subjected to the detonation of a buried charge was characterized. A Lagrangian representation was used for the test structure and panel and an Eulerian representation was used for the soil, explosive, and ambient air. The detonation of the charge was approximated using programmed burned techniques and its detonation products were modeled with the Jones-Wilkins-Lee (JWL) equation of state. A simplified hybrid elastic-plastic material model for geologic materials developed by the U.S. Army - ERDC was implemented as a VUMAT and used to describe the soil. The simulations agree favorably with the test results and produce higher fidelity solutions than traditional analytical or empirical blast models. It is shown that Abaqus/Explicit can be used to accurately predict the response of a structure subjected to a near-field blast event with specific application to underbelly blast events on vehicles.