L. Franks's Advances in Ceramic Armor III: Ceramic Engineering and PDF

By L. Franks

ISBN-10: 047019636X

ISBN-13: 9780470196366

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. issues comprise obvious ceramics for influence resistance, safeguard opposed to mine blast and fragments, demanding situations dealing with ceramic armor brands, novel fabric ideas and improvement of legitimate armor layout and characterization instruments to foretell functionality for air and floor automobiles in addition to the person soldier.

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5-mm thick tile, the speed of the elastic wave can be calculated from the relationship: co =E and is 1 1 . 7 1km's for the liquid phase sintered Sic. Cline and Wilkins [9] identified the importance of the impedance of the ceramic for defeating a projectile. Recent work [lo] has suggested that there is a critical thickness required to shatter a WC-Co projectile and this correlates with the elastic impedance of the tile. 3mni for a jlmmx5lnim square tile. For a larger tile, it is likely to be slightly thinner.

The first interface that is encountered by the wave is at the ceramic / polycarbonate interface. Due to the relatively low impedance of the adhesive layer between the ceramic and the polycarbonate, much of the wave is reflected as a tensile wave that releases the state of compression and causes damage. However, at this point in time the intact material surrounding the damaged zone provides inertial confinement. Similarly the radially expanding portion of the wave eventually encounters a border and due to the presence of a free surface, is completely reflected as a tensile wave.

While and A , ~denote the critical displacement jumps in normal and tangential directions. respectively. The parameter > denotes a monotonically decreasing damage parameter which quantifies the evolution of damage i n the material and couples mode I and mode I1 f d t ~ r e . ” . 98) due to the separation across cohesive surfaces. Cohesive elements fail completely when s reaches zero. Fig. 11: Normal and shear displacements of a cohesive element placed between two volumetric elements. 2 Generalized cohesive element technique A ma,jor drawback of the cohesive technique is that the propagating crach is pro\ided with a predeterniined number and orientation of crack paths restricting resultant crack motion.

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Advances in Ceramic Armor III: Ceramic Engineering and Science Proceedings by L. Franks

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