Portal de Periódicos da CAPES

Sphere Impact Induced Damage in Ceramics: I. Armor-Grade SiC and TiB2

2008; Wiley; Linguagem: Inglês

10.1002/9780470291276.ch20

1940-6339

Jerry C. LaSalvia, M. J. Normandia, H.T. Miller, D. E. Mackenzie,

High-Velocity Impact and Material Behavior

Armor-grade SiC and TiB2 cylinders (25.4 mm × 25.4 mm) were impacted with WC-6C0 spheres (6.35 mm diameter) at velocities between 50 m/s and 500 m/s. The recovered cylinders were subsequently sectioned and metallographically-prepared to reveal the dominant sub-surface damage types and change in damage severity as a function of impact velocity. In general, both ceramics exhibited radial, ring, Hertzian cone, and lateral cracks which increased in number and length as the impact velocity increased. Furthermore, both ceramics exhibited a comminuted region directly beneath the impact center which appeared to be wholly contained between the set of Hertzian cone cracks which formed first The comminuted region consisted of a high density of microcracks located at grain boundaries. The observed effect of impact velocity on the resulting damage and differences in damage between these two armor-grade ceramics will be presented.