By Lisa Prokurat Franks, Jonathan Salem, Dongming Zhu
Papers from the yank Ceramic Society's thirty first overseas convention on complicated Ceramics and Composites, held in Daytona seashore, Florida, January 21-26, 2007. subject matters comprise obvious ceramics for impression resistance, safety opposed to mine blast and fragments, demanding situations dealing with ceramic armor brands, novel fabric strategies and improvement of legitimate armor layout and characterization instruments to foretell functionality for air and flooring autos in addition to the person soldier.Content:
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Additional resources for Advances in Ceramic Armor III: Ceramic and Engineering Science Proceedings, Volume 28, Issue 5
The performance increases as the impact occurs further from the border. The DoP for penetration at 10mni from the border was 40nun. This was almost three-times the DoP w-lien the penetration was far from the border. For example. there was 151nm DoP when the distance was 45nim from the closest border. Beyond a critical distance (between 30 and 35mm) the DoP reaches a consistent value (allowing for experimental scatter). At this location, the material‘s intrinsic ballistic performance was measured due to the absence of border effects.
Steinmann, “A finite element method for the computational modeling of cohesive cracks,‘‘Int. J. Numer. Meth. Engng. 1-3 (2000). H. Song, P. M. A. Areias and T. Belytschko, “A method for dynamic crack and shear band ropagation with phantom nodes,” Int. J. Numer. Meth. Engng. 868 - 893 (2006). M o h o , Z. Bao and R. Fedkiw, “A Virtual Node Algorithm for Changing Mesh Topology During Simulation,” International Confirence on Computer Graphics and Interactive Techniques. 385-392 (2004). kJ. 44 . Advances in Ceramic Armor 111 Advances in Ceramic Armor III Edited by Lisa Prokurat Franks Copyright 02008 The American Ceramic Society HIERARCHY OF KEY INFLUENCES ON THE BALLISTIC STRENGTH OF OPAQUE AND TRANSPARENT ARMOR Andreas Krell Fraunhofer Institut fur Keramische Technologien und Systeme (IKTS) WinterbergstraBe 20 D - 01277 Dresden, Germany Elmar Strassburger Fraunhofer Institut f i r Kurzzeitdynamik (EMI) Am Klingelberg 1 D - 79588 Efringen-Kirchen, Germany ABSTRACT A hierarchic order of influences on the wear resistance of ceramics is adopted here and applied in a modified form on recent ballistic results with sub-micrometer opaque and transparent oxide armor in order to understand interactions between different parameters that govern the ballistic strength.
Both t>pe of indentations exhibited transgranular fracture pattern. But the crack path under static indentation also showed an intermittent zig-zag pattern within the grains which was not observed under dynamic indentation. The observed crack pattern under static loading has been correlated to the formation of cleavage steps on fracture surface. 4. A 2-D finite element framework has been developed to model the transgranular cracking observed under static indentations. 42 Advances in Ceramic Armor Ill Static and Dynamic Indentation Response of Fine Grained Boron Carbide 5.