Blast
Modeling and simulation of defense applications...
The effect of blast loading has become a critical issue in the design, protection, and rehabilitation of engineering structures following the terrorist attacks on civil infrastructures in recent years.The detonation of an explosive charge liberates energy causing pressure disturbances in the surrounding air which develop into a blast wave system led by an incident shock wave. The incident wave strikes the target and rebounds with greater amplitude as a reflected wave. This reflected pressure becomes the applied blast load. The pressure is converted to forces applied to the nodes in finite element mesh.
At present, most blast resistant analyses make use of simplistic blast loading and structure models but it is difficult to assume rational blast loading for a complicated structure that includes sophisticated surfaces and corners. Advanced numerical simulations thus become the economic and reliable approaches for this purpose. In this type of numerical simulations, generally all the critical components in the problem are properly modeled, including explosive, air, fluid-structure interaction, and structures.
Defense vehicle occupant protection simulation and mine blast simulation
Designing vehicles to protect occupants from explosive threats is complicated by the complex set of physics that occurs from the point of detonation to the response of the occupants. Consequently, vehicles are typically developed through an iterative process of destructive field testing in order to determine the level of blast protection. Developing a virtual environment to evaluate competing protective designs is crucial. This environment allows the designer to analyze and evaluate a large array of test conditions and prototypes.
It also offers a first level optimization of protective blast protection designs prior to committing to destructive field testing. This design methodology significantly reduces development costs and produces a better vehicle.
