Shock response of AD995 alumina

Dandekar, Dattatraya P.; Bartkowski, Peter T.

doi:10.1063/1.46437

Cited by 25 publications

(9 citation statements)

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“…AlON's GHEL of 11.0 to 11.4 GPa compares well with those of other brittle materials (6.7 GPa for AD995 [11], 14-20 GPa for z-cut sapphire [12], 12 GPA for SiC [13] [14], and 6 GPa for soda lime glass [9]). The strength under shock loading (7.2-7.5 GPa) is significantly higher than under bar loading (4 GPa [1]), presumably due to the suppression of microcracks by pressure.…”

Section: Discussionsupporting

confidence: 63%

The Hugoniot Elastic Limit of ALON

Cazamias¹

2002

AIP Conference Proceedings

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We performed plate impact experiments on the transparent polycrystalline ceramic aluminum oxynitride (A1ON, transparent alumina). From VISAR measurements, the Hugoniot Elastic Limit, GHEL, is 11.0-11.4 GPa with a corresponding yield strength of 1.2-1.5 GPa. A transverse gauge gives a yield strength of 8.7 GPa for a longitudinal stress of 13.9 GPa, which implies that the failed A1ON possesses at least its GHEL strength.

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Section: Discussionsupporting

confidence: 63%

The Hugoniot Elastic Limit of ALON

Cazamias¹

2002

AIP Conference Proceedings

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“…All experiments conducted in this work were at 15.5 GPa or below and are considered elastic. As such, the spall strength of the material can be determined by the magnitude of the pull back particle velocity change Au pb [8,9]. The spall strength is calculated using the following formula:…”

Section: Resultsmentioning

confidence: 99%

Spallation of Hot Pressed Boron Carbide Ceramic

Bartkowski¹,

Dandekar²,

Grove³

2002

AIP Conference Proceedings

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This work describes the results of plane shock wave spallation experiments conducted on Hot Pressed Boron Carbide marketed by Cercom as PAD B 4 C (>99% pure). Density of the material was determined to be 2.508 ±0.016 Mg/m 3 while the longitudinal and shear wave velocities were measured at 13.49 ±0.18 km/s and 8.65 ±0.08 km/s, respectively. Spallation thresholds calculated from the measured "pull-back" velocity were determined up to an impact stress of 15.5 GPa. The values of spall threshold do not vary significantly with impact pressure but do exhibit a pulse width dependency indicating a time dependent generation of defects. The value of spall strength of boron carbide is 0.35 ± 0.07 GPa when shocked between 2 and 15.5 GPa. The values of release impedance lie between 33 and 37 Gg/m 2 s and are in good agreement with the longitudinal impedance of 33.8 ±0.5 Gg/m 2 s at the ambient condition measured ultrasonically. The free-surface velocity profiles obtained from these experiments were numerically simulated using Rajendran-Grove (R-G) ceramic model. The paper provides the values of material constants required by the R-G ceramic model for boron carbide.

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“…The impact velocity in these experiments corresponds to the compressive stress values in the specimen, ranging from 2 to 13 GPa. The values of spall strength were calculated using the expression [43,44].…”

Section: Dynamic Tensile (Spall) Strengthmentioning

confidence: 99%