Mathematical Problems in Engineering. Resolution of the latter very small thickness would require extremely small finite elements, which in turn would drastically increase computational cost through time step reductions imposed by the Courant condition [ 20 ], written explicitly later in Penetration simulations into ceramic-metal targets: It was speculated that soft polymer layers in the three tile configuration enabled dispersion of the initial, primary compressive shock wave that caused more severe damage in the single tile configuration. Subscribe to Table of Contents Alerts.
Under the hood
In summary, numerical results listed in Table 2 and shown in Figures 4 and 5 demonstrate how resolution of geometry and behavior of thin interfaces between layers of stiff material in armor systems strongly affects predicted ballistic efficiency. Balakrishna Bhat, and N. Keywords Penetration equation , ballistic limit analysis , projectile—target pair. Army Ballistic Research Laboratory , Further details can be found in [ 2 , 18 ].
Shot penetration from ballistic data. - PubMed - NCBI
In particular, the penetrator-target configuration simulated in this work depicts that examined in experiments of [ 1 ]. Computational results for ballistic efficiency are compared with experimental data from the literature. Ballistic performance of the ceramic-polymer system or a single tile in some cases is quantified by residual penetration depth into a T6 aluminum Al backing block of thickness Resolution of the latter very small thickness would require extremely small finite elements, which in turn would drastically increase computational cost through time step reductions imposed by the Courant condition [ 20 ], written explicitly later in Or do you have a link to it online, so it can be more easily used for sourcing. When bonding is tied, efficiency decreases to zero, and residual velocity becomes nonzero specifically, of 0.
The closest agreement between model and experiment is obtained when polymer interfaces are not explicitly represented in the numerical calculations, suggesting that the current model representation of such interfaces may be overly compliant. Read the full text or download the PDF: Remember me Forgotten your password? Residual penetrator velocity versus impact velocity from simulations: Vol 28, Issue 7, Uncertainties in material properties and erosion criteria, omission of contact friction, and possible artifacts of far-field boundary conditions may adversely affect accuracy or precision of results. The closest agreement was obtained when polymer interfaces of small but finite thickness were not explicitly resolved, suggesting that the model representation of such interfaces is overly compliant.