Jeffrey Swab's Advances in Ceramic Armor V (Ceramic Engineering and Science PDF

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By Jeffrey Swab

The Armor Ceramics Symposium presents an annual discussion board for the presentation and dialogue of unclassified details and concepts bearing on the advance and incorporation of ceramic fabrics for armor purposes. This choice of articles from the 7th variation of this symposium inquisitive about influence, Penetration and fabric Modeling, fabric suggestions, approaches and Characterization, the applying of NDE, and obvious Armor.

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Strain-stress state in each region is determined and analyzed. Condition of absence of pore formation region is specified. Cavity expansion pressure is determined. Energy losses on elastic deformation, fracture and compaction (non-elastic deformation) of material are calculated and compared for a number of materials. Penetration depth and target resistance depending on porosity is determined. INTRODUCTION It is well-known [l-31 that the models of expansion of spherical and cylindrical cavities in materials are useful tool for investigation of high-velocity penetration and hardness.

Advances in Ceramic Armor V Ballistic Impact Damage Observations in a Hot-Pressed Boron Carbide (el (0 Figure 8. (a) Undamaged region. (b) Fissure. (c) Penny-shaped axial-splitting cracks near the shotline axis. (d) Lone axial-splitting crack with secondary cracks near the exposed impact cone surface. (e) Coalesced axial-splitting cracks and secondary cracks near the exposed impact cone surface. ( f ) Fragmentation of material between cracks. Advances in Ceramic Armor V . 26on the interface defeat of ductile penetrators by borosilicate glass.

When the shear strength of the bed exceeds that of the specimedanvil interface, bed deformation ceases and subsequent shearing occurs by sliding of the anvil over the fragment bed. Glass particles at the anvil interface are initially in point contact, and hence present a small effective contact area over which friction can act. As shear stress is increased, frictional strength is overcome and these contact areas slip, resulting in measurable shear strain and a flattening of the stressistrain curve, but also increasing the contact area and hence requiring higher shear stress for the next increment of displacement.

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