Time-resolved penetration into pre-damaged hot-pressed silicon carbide

We have conducted a series of experiments to examine projectile penetration of cylindrical hot-pressed silicon carbide (SiC) ceramic targets that are pre-damaged to varying degrees under controlled laboratory conditions prior to ballistic testing. SiC was thermally shocked to introduce non-contiguou...

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Bibliographic Details
Published in:International journal of impact engineering 2008-08, Vol.35 (8), p.661-673
Main Authors: Anderson, Charles E., Behner, Thilo, Orphal, Dennis L., Nicholls, Arthur E., Templeton, Douglas W.
Format: Article
Language:English
Subjects:
Applied sciences
Compacted powder
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
In-situ comminution
Inelasticity (thermoplasticity, viscoplasticity...)
Metals. Metallurgy
Penetration velocity
Physics
Silicon carbide
Solid mechanics
Structural and continuum mechanics
Time-resolved penetration
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Summary:We have conducted a series of experiments to examine projectile penetration of cylindrical hot-pressed silicon carbide (SiC) ceramic targets that are pre-damaged to varying degrees under controlled laboratory conditions prior to ballistic testing. SiC was thermally shocked to introduce non-contiguous cracks. Another set of targets was thermally shocked and then additional damage was induced by load–unload cycling in an MTS machine while the ceramic specimen was confined in a 7075-T6 aluminum sleeve. Finally, targets were made by compacting SiC powder into a 7075-T6 aluminum sleeve. For each of these target types, long gold rod penetration was measured as a function of impact velocity v p over the approximate range of 1–3 km/s, with most data between 1.5 and 3 km/s. Penetration as a function of time was measured using multiple independently timed flash X-rays. Results are compared with previous results for non-damaged (intact) SiC targets. Key results from these experiments include the following: (1) penetration is nominally steady state for v p>1.5 km/s; (2) for all target types, the penetration velocity u is a linear function of v p (except for the lowest impact velocities); and (3) it is found that u intact< u pre-damaged< u in-situ comminuted< u powder< u hydrodynamic.
ISSN:0734-743X
1879-3509
DOI:10.1016/j.ijimpeng.2007.12.003