considerations on the explosion resistant design of special infrastructures have increased in the recent years. amongst the various types of infrastructures, road and railway tunnels have a unique importance due to their vital role in connection routes in emergency conditions. in this study, the explosion effects of a projectile impacting on a railway tunnel located in a jointed rock medium has...

In this note, a theoretical model for analyzing of normal penetration of the ogive – nose projectile into metallic targets is presented .The failure is assumed to be asymmetry petalling and the analysis is performed by using the energy balance and work done .The work done consist of the work required for plastic deformation Wp, the work for transferring the matter to new position Wd and the wor...

The primary objective is establishing tangible experimental methods and data analyzing methods in order to grasp various phenomena, which were the behavior of ejecta and projectile, the penetration depth and speed of projectile, fractured grains and the pressure distribution, induced by high-speed impact of projectile on sand. The plate impact experiments were conducted using vertical powder gu...

In the present study, the three-dimensional elastic discrete element method (DEM) and the elastic finite element method (FEM) analysis were, respectively, applied to the randomly distributed identical spheres as a granular target and to the cylindrical projectiles in order to clarify dynamic response during penetration. In the target, it was found that highly densified region was formed just ah...

A number of mechanisms have been proposed for the penetration of laminates comprising ultra-high molecular weight polyethylene (UHMWPE) fibres in a polymeric matrix. Two-dimensional ballistic experiments are conducted in order to directly observe the transient deformation and failure processes occurring immediately under the projectile via high-speed photography. Two sets of experiments were co...

We present a general framework to describe the dynamics of a hard projectile penetrating into a solid target. Rigid-body dynamics, differential area force law and semi-empirical resistance function are used to formulate the motion of the hard projectile. The proposed model is capable of predicting the projectile trajectory under various oblique and yaw angles. Critical conditions for the occurr...

To study penetrating traumatic brain injury biomechanics, a full metal jacket 9-mm handgun projectile was discharged into a transparent brain simulant (Sylgard gel). Five pressure transducers were placed at the entry (two), exit (two), and center (one) of the simulant. High-speed digital video photography at 20,000 frames per second (fps) was used to capture the temporal cavity pulsation. Press...