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 yankee Ceramic Society’s thirty seventh foreign convention on complex Ceramics and Composites, held in Daytona seashore, Florida, January 27-February 1, 2013.This factor comprises papers offered within the Armor Ceramics Symposium on subject matters reminiscent of production; High-Rate Real-Time Characterization; Microstructural layout; Nondestructive Characterization; and Phenomenology and Mechanics of Ceramics Subjected to Ballistic Impact.
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Additional info for Advances in Ceramic Armor IX: Ceramic Engineering and Science Proceedings, Volume 34 Issue 5
Belvoir, VA 22060 ABSTRACT Advanced ceramic materials, such as SiC and B4C, have long been used in applications that take advantage of their very high hardness, low density, and chemical stability. Example uses are armor, grit blast nozzles, and wear resistant components in mining. In general, B4C out performs SiC in these applications due to its higher hardness and lower density. However, in cases where the ceramic component is exposed to extremely high pressure (> 20 GPa), the performance of B4C falls below that of SiC.
34 • Advances in Ceramic Armor IX Effect of Prestressing on the Ballistic Performance of Alumina Ceramics i m i ». * \ - ■ • ■ ► 0 •• JL 50 5 mnicvp * ' 5 mm norm ^^ ^ 6 mm oxp 6 mm norm ^* 7mm exp <»<•— 7 mm norm * 100 ISO 200 250 Prestress (MF*) 300 350 400 Figure 4. The experimental results for DOP of alumina tiles of different thicknesses versus applied prestress. Fracture of WC Core Radiographic stills that were taken of witness blocks following the ballistic experiments are displayed in figure 5 below.
When comparing damage on the strike face of the solid tile to that of the perforated tiles, the ring and radial cracking are drastically reduced. In fact, the ceramic in the perforated tiles is largely intact on the strike face with a localized damage zone and some minor cracks around the edges of the tiles. A close-up of the impact zone is provided in Figure 6. The solid tile shows a somewhat regular pattern of radial and ring cracking. The wide and medium spaced ceramics each show a random pattern of fissures, and the close spaced perforations limit the crack propagation on the surface significantly.
Advances in Ceramic Armor IX: Ceramic Engineering and Science Proceedings, Volume 34 Issue 5 by Jerry C. LaSalvia, Soshu Kirihara, Sujanto Widjaja