Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 139 (Apr. 2008), p. 77-82
ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
We present results from molecular dynamics simulations of shock-induced hydrodynamicvoid collapse in a model energetic crystal. During void collapse, hotspot formation is observed thatleads to subsequent detonation. The hotspot formation mechanism is identified as shock energyfocusing via jetting. There is another initiation mechanism that arises from the interaction ofreflected shock waves with the rigid piston, which is considered to be an artifact. Such artifact canbe eliminated by altering the location of the void. The detonation threshold as a function of thevelocity of the driven piston is determined for various void geometries. It is found that a systemcontaining a void has a lower detonation threshold than that of a perfect energetic crystal. Theamount of reduction of the detonation threshold depends on the geometry of the void. For squarevoids, there exists a minimum size above which reduction of the detonation threshold occurs.Among voids that have an equal volume, the void that is elongated along the shock direction givesthe lowest detonation threshold
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.139.77.pdf
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