Tantalum sound velocity under shock compression

Shock compression and spallation of single crystal tantalum

We present molecular dynamics simulations of shock-induced plasticity and spall damage in single crystal Ta described by a recently developed embedded-atom-method (EAM) potential and a volumedependent qEAM potential. We use impact or Hugoniotstat simulations to investigate the Hugoniots, deformation and spallation. Both EAM and qEAM are accurate in predicting, e.g., the Hugoniots and surfaces. ...

Strength of Polycrystalline Ceramics under Shock Compression

Shock-induced phase transformation in tantalum.

A TEM study of pure tantalum and tantalum-tungsten alloys explosively shocked at a peak pressure of 30 GPa is presented. While no omega phase was found in shock-recovered pure Ta and Ta-5W which mainly contain a cellular dislocation structure, a shock-induced omega phase was found in Ta-10W which contains evenly distributed dislocations with a density higher than 1 × 10(12) cm( - 2). The shock-...

Loading velocity dependent permeability in agarose gel under compression.

A new approach for characterization of agarose gel permeability under compression at different loading velocities is proposed. Uniaxial compression tests on thin agarose gel specimens in a rigid porous confinement cell immersed in a water bath are undertaken. The equilibrium response of the gel, which is assumed to be achieved under extremely low-loading velocity (of the order of tens nanometer...

Electrical measurements on fused quartz under shock compression

The resistivities of specimens ofSi02 (fused quartz) singly and doubly shocked in the 10-45 and 27-90 GPa ranges, respectively, demonstrate a marked decrease from values of10-0.1 11-m at a single-shock pressure of -40 and a double-shock pressure of 7 4 G Pa. These states correspond to calculated shock temperatures of3300 and -3600 K, respectively. At shock pressures below 36 GPa the measured re...