By Jerry C. LaSalvia, Soshu Kirihara, Sujanto Widjaja
Ceramic Engineering and technological know-how lawsuits quantity 34, factor five - Advances in Ceramic Armor IX
a suite of 14 papers from the yankee Ceramic Society’s thirty seventh overseas convention on complicated 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 similar to 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 info for Advances in Ceramic Armor IX: Ceramic Engineering and Science Proceedings, Volume 34 Issue 5
The device permits the application of prestress in the range of 0 and 500 MPa on square tiles of thickness between 5 and 9 mm by means of a hand-operated rotary-to-linear actuator. As shown in figure 2, a crank (1) is rotated about a vertical power thread (2), causing a sliding wedge (3) to be raised or lowered. As the wedge is lowered in the channel, a horizontal force is applied to the left vice plate (4). The ceramic tile undergoes biaxial compression, as the opposing force from the thick plate rigid body (7) is transferred via the embedded load cell (6) and right vice plate (5).
Detailed graphs are then created plotting crack, damage and -if visible- compression and shear stress wave velocities. , Vista, CA. Some of the physical and mechanical properties of the material are listed in Table 1. Table I. Material properties of PAD B4C ~ Density Av. 9 4 pt. Bending Strength [MPa] 450 Eight tests were performed at impact velocities between 50 ms and 1000 m/s. Figure 2 shows a selection of six high-speed photographs from a test at 50 m/s. Two cracks could be observed during the time interval of observation (5 us).
Pertinent to this study is a combination of the different crack types. Cone cracks have a general cone shape, and are typically generated with an initial crack in the shape of a ring around the contact followed by a spread of the crack through the piece at some characteristic angle to the load axis. Radial, median, and half-penny cracks run parallel to the load axis. Generally radial cracks extend close to the surface; median cracks propagate beneath the surface and are truncated by the deformation zone boundary or the material surface; and half penny cracks are a coalescence of the two and take on the shape of a half penny..