By Jerry C. LaSalvia, Soshu Kirihara, Sujanto Widjaja
Ceramic Engineering and technology lawsuits quantity 34, factor five - Advances in Ceramic Armor IX
A choice of 14 papers from the yank Ceramic Society’s thirty seventh foreign convention on complicated Ceramics and Composites, held in Daytona seashore, Florida, January 27-February 1, 2013.This factor contains papers offered within the Armor Ceramics Symposium on themes resembling production; High-Rate Real-Time Characterization; Microstructural layout; Nondestructive Characterization; and Phenomenology and Mechanics of Ceramics Subjected to Ballistic Impact.
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Extra resources for Advances in Ceramic Armor IX: Ceramic Engineering and Science Proceedings, Volume 34 Issue 5
13342. 40 30 ♦ ♦ lower cone crack o upper cone crack ~ 20 E E Jy> > >Jr |V|owerconecracl< = 5 7 9 6 ± 1 2 3 m/S 6 t[ M s] 8 10 | 12 Figure 3. Path-time history of crack propagation (left) and reassembled specimen (right); Test no. 13342. The time interval chosen for the observation of fracture propagation was too small in order to see the complete destruction of the specimen. Figure 3 illustrates the final degree of damage. The high number of relatively large fragments allowed a partial reconstruction of the tile.
At high prestress, the amount of alumina that has flaked off is also significantly less, and ceramic material appears to be nearly undamaged near the tile perimeter. (a) (b) Figure 6. Photographs of strikeface of 7 mm-thick alumina tiles following ballistic tests at minimum and maximum applied prestress levels, (a) 5 MPa; (b) 390 MPa. 36 • Advances in Ceramic Armor IX Effect of Prestressing on the Ballistic Performance of Alumina Ceramics NUMERICAL MODELING FE Model Numerical simulations of the ballistic DOP tests with prestress were performed using a 2-D axisymmetric Lagrangian solver of the LS-DYNA commercial software.
Across the embedded load cell. Therefore, the actual compressive stress experienced by the tile can be accurately monitored during force loading and ballistic impact. An example of this stress history, captured in a ballistic experiment on a 5 mm-thick tile, is displayed in figure 3 below. e. 292 MPa, is observed. 5 msec, the projectile impact is observed (highlighted in inset graph); compressive stress is observed to increase slightly to 301 MPa. Advances in Ceramic Armor IX • 33 Effect of Prestressing on the Ballistic Performance of Alumina Ceramics *•">» Figure 3.
Advances in Ceramic Armor IX: Ceramic Engineering and Science Proceedings, Volume 34 Issue 5 by Jerry C. LaSalvia, Soshu Kirihara, Sujanto Widjaja