Dynamic Compaction of Aluminum Nitride Powder: Hugoniot Measurement and Comparison with Static Behavior

Autor:	W. H. Gourdin, S. L. Weinland
Rok vydání:	1985
Předmět:	Shock wave Materials science Metallurgy Compaction chemistry.chemical_element Nitride Shock (mechanics) chemistry Aluminium Materials Chemistry Ceramics and Composites Relative density Composite material Dynamic compaction Static behavior
Zdroj:	Journal of the American Ceramic Society. 68:674-679
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1985.tb10123.x
Popis:	A limited number of shock Hugoniot measurements were performed on two unsintered aluminum nitride powder compacts having initial densities of 1.30 and 1.53 g/cm3. Stresses achieved ranged from 0.25 to 1.8 GPa, corresponding to linear compaction rates of 0.2 to 0.6 km/s. Densification is incomplete behind the first shock wave, proceeding only to ∼70% of the solid density, regardless of the initial density. On reshock, however, significantly higher densities are achieved. Initial compaction of the powder to a relative density of 65% to 70% occurs readily at stresses below 0.25 GPa. For greater stresses, however, densification is slight. Comparisons with static compression data for the same powders suggest that this resistance to compaction is an effect of compaction rate.
Databáze:	OpenAIRE
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