Tests of crater formation are appropriate tools to study the blast phenomena, the behavior and destructive power of different explosives and the response of soils and rocks under this type of load. The mechanism of crater formation is complex and it is related to the dynamic physical properties of air, soil and air/soil interface. Even very carefully performed cratering tests give deviations in the dimensions measured of about 10%, while differences of as much as 30–۴۰% are common . A cavity is always formed when a confined explosion is produced in a mass of soil. If the explosion is close to the surface, a crater is formed, a complex interaction taking place between gravity effects, soil strength and transient load conditions. The most important variables in defining the crater shape and size are the mass W of the explosive and the depth of the detonation beneath the air/soil interfaced. When d< 0, the explosive is detonated over the air/soil interface,d= 0 when the detonation occurs in the air soil interface and d> 0 when the explosive is detonated beneath the soil surface. Ford> 0, the crater mechanism is altered by gravitational effects. When the depth of the detonation increases, larger amounts of subsoil must be expelled by the explosion. Thus the crater radius and the depth of the crater increase when d increases, until a certain limit value, from which they rapidly decrease.
In this tutorial Air,Soil and TNT are modeled as three dimensional part.You can see a figure about the position of these parts at below
To model air behavior ,EOS(Equation Of State) as ideal gas with viscosity, To model soil elasticity with Mohr-Coloumb plasticity and JWL equation has been implied for TNT.You can see a figure about the real explosion at below
Dynamic explicit procedure is appropriate for this type of analysis . During the explosion the TNT wave as a pressure load create a huge crater inside the soil . You can some figures of this simulation at below about the results
You can provide CAE ,INP,and English video files of this simulation here. The cost of these files are Thirty US Dollars. you can click on the bellow bottom to beginning process
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