Planar compaction of ceramic powders with mining explosives
conference paper
Shock compaction experiments of B4C powders have been performed using a planar configuration.
The powders were contained between metal plates. On top of the upper plate, having a thickness of about 10 mm, was a layer of mining explosives. For this configuration, computer simulations have been performed with use of the hydrocode Autodyn. In comparison with the cylindrical compaction process the planar compaction process appears to be quite different. The reason is the very low detonation velocity of the used mining explosives (2-4 km/s), which is much lower than the sound and shock speeds of the steel plate, in combination with the relatively large thickness of the metal layer. As a result, the nature of the compaction process of the powder initially more resembles a quasi-static compaction process than a shock compaction process. Due to the quasi-static nature of the compaction, the pressure release in the powder after compression is very gradual. Therefore, no strong rarefaction waves leading to high tensile stresses in the compact arise. Flat plates (10 x 10 cm, 0.6-0.8 cm thick) of Al (20-30 vol %) infiltrated B4C have been fabricated using this configuration.
The powders were contained between metal plates. On top of the upper plate, having a thickness of about 10 mm, was a layer of mining explosives. For this configuration, computer simulations have been performed with use of the hydrocode Autodyn. In comparison with the cylindrical compaction process the planar compaction process appears to be quite different. The reason is the very low detonation velocity of the used mining explosives (2-4 km/s), which is much lower than the sound and shock speeds of the steel plate, in combination with the relatively large thickness of the metal layer. As a result, the nature of the compaction process of the powder initially more resembles a quasi-static compaction process than a shock compaction process. Due to the quasi-static nature of the compaction, the pressure release in the powder after compression is very gradual. Therefore, no strong rarefaction waves leading to high tensile stresses in the compact arise. Flat plates (10 x 10 cm, 0.6-0.8 cm thick) of Al (20-30 vol %) infiltrated B4C have been fabricated using this configuration.
TNO Identifier
131041
ISBN
1-56396-923-8
Publisher
TNO
Source title
1999 Shock Compression of Condensed Matter, Snowbird, UT, USA, 27 June - 2 July 1999
Pages
745-750
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