Momentum trapping

Given simple centered flow conditions where the driver, target, and momentum trapping materials are the same, the minimum trapping width is given by [20]... 

Attenuators may be used to reduce both peak pressure impulse. They act as momentum traps ... 

The advantage of the high-explosive assembly over laser irradiation and electrical discharge devices is the controlled recovery of the sample. The recov-ciy system consists of two rectangular steel blocks acting as momentum traps and a cylindrical ARMCO iron container, which is embedded into the upper steel block. The disc-shaped specimen is encapsulated in this container This design allows complete recovery of relatively large samples (diameters of 10— 20 mm and thickness up to several millimeters). 

Differences of petrographic textures at large scale are clearly seen in the sample from experiments with two types of momentum traps one is surrounded by steel and the other by a fragile ceramic cement used to insulate tlie heating elements (Fig. I of [18]). Samples shocked in the ceramic cement show higher degrees of lateral deformation, from 1.1 at 13.4 GPa and room temperature to 1.6 GPa at... 

GPa at 608°C (Table 2.2). This is in contrast to tlie fact tliat shocked samples supported by tlie steel momentum trap show a lower degree of deformation (-1.2 below about 37.6 GPa) (Table 2.2). We did not find any temperature dependence of the deformation features. The samples shocked to... 

GPa with both momentum traps. These microfaults are oblique (—30-40°) to the shock front. In many cases glassy veins form at slipped boundaries and penetrate through the sample container to the sample, indicating that these veins are fonned at the time of shock loading. The melt veins are often extensions of the brecciated portion. We did not observe any difference of shock effects in minerals at the given shock pressures (see below). The sample sliocked at... 

The mixed powders with prescribed ratio were tapped into the powder container as illustrated in the right hand side of Figure 1. Hard steel powder in the top side was used to prevent the scattering of FGM powders from the powder container and SUS304 powder in the bottom side was used for momentum trap. 

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