INTERSCALE MOMENTUM EXCHANGE IN DYNAMICALLY DEFORMED HETEROGENEOUS MEDIUM

被引：0
|
作者：
Meshcheryakov, Yu. I. [1 ]
Divakov, A. K. [1 ]
Zhigacheva, N. I. [2 ]
Barakhtin, B. K. [2 ]
机构：
[1] RAS, Inst Problems Mech Engn, Bolshoi Pr 61, St Petersburg 199178, Russia
[2] Cent Res Inst Construct Mat Prometei, St Petersburg, Russia
来源：
SHOCK COMPRESSION OF CONDENSED MATTER - 2011, PTS 1 AND 2 | 2012年 / 1426卷
关键词：
particle velocity variation; velocity defect; interscale momentum exchange; dynamic recrystallization; spall-strength;
D O I：
10.1063/1.3686473
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Two regimes of interaction of shock wave and microstructure in heterogeneous medium are studied: (i) equilibrium reversible interscale momentum exchange, (ii) non-equilibrium irreversible momentum exchange. The first regime corresponds to propagation of shock wave in a medium of pre-existing heterogeneity. During the second regime, a dynamic heterogeneity is dominant. Shock tests of D16 Al alloy within impact velocity range of 85 divided by 450 m/s revealed a dependence of above regimes on the strain rate. Maximum dynamic strength is found to be realized at the impact velocity where macroscopic strain rate equals to the local strain rate corresponding to the mesoscale.
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页数：4
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