By Lisa Prokurat Franks, Jonathan Salem, Dongming Zhu
Papers from the yankee Ceramic Society's thirty first foreign convention on complex Ceramics and Composites, held in Daytona seashore, Florida, January 21-26, 2007. themes contain obvious ceramics for impression resistance, safeguard opposed to mine blast and fragments, demanding situations dealing with ceramic armor brands, novel fabric innovations and improvement of legitimate armor layout and characterization instruments to foretell functionality for air and floor automobiles in addition to the person soldier.Content:
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Additional info for Advances in Ceramic Armor III: Ceramic and Engineering Science Proceedings, Volume 28, Issue 5
Once the displacement jiuiips are calculated along the crack. cohesive tractions can be found from Eq. ( I ) and (2). 3 Nuiiierical studies To rationalize the experimentally observed static indentation induced crack patterns. some preliminary numerical studies have been conducted on a finite elenient mesh containing a single cleavage plane (consists of cohesive elements and with a11 orientation of 30") whereas rest of the domain consists of CST elements (see Fig. 13). The computational domain is fixed at the right edge while displacement A has been applied to the left edge.
On the other hand, however: the calculation also shows how the fragment size can be increased at a given (high) stressing rate: (i) by high crack propagation velocity (+high Young's modulus) and (ii) by decreasing the number of cracks per volume (i e. by largercrackspacing). ). From the above considerations it is concluded that the dynamic macroscopic failure on impact is more related to stressing rates and to the elastic response than to the static strength of ceramic armor components. The structure of fragmentation is a function of stressing rates (and modes) but depends also on E, and on microstructural features.
Microstructural analysis was later performed on the specimens to identify the influence of strain rate on indentation induced crack patterns. A 2-'D plane strain numerical framework based a novel generalized cohesive element method in conjunction with the conventional cohesive volumetric finite element (CVFE) m0de1"~'~has been developed to simulate the observed fracture behavior and gain further insight. 2. EXPERIMENTAL Boron carbide powder with 800 nm particles was used as the starting material, see Fig.
Advances in Ceramic Armor III: Ceramic and Engineering Science Proceedings, Volume 28, Issue 5 by Lisa Prokurat Franks, Jonathan Salem, Dongming Zhu