The influence of morphology on the low- and high-strain-rate compaction response of CeO2 powders

Fredenburg, David A.; Koller, Darcie Dennis; Coe, Joshua D.; Kiyanda, Charles B.

doi:10.1063/1.4868356

Cited by 21 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that the macroscopic shock response is governed by bulk sample composition and is relatively insensitive to the constituent size, in agreement with previous impact experiments3132.…”

Section: Discussionsupporting

confidence: 91%

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Rutherford

Chapman

Derrick

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Chondritic meteorites are fragments of asteroids, the building blocks of planets, that retain a record of primordial processes. Important in their early evolution was impact-driven lithification, where a porous mixture of millimetre-scale chondrule inclusions and sub-micrometre dust was compacted into rock. In this Article, the shock compression of analogue precursor chondrite material was probed using state of the art dynamic X-ray radiography. Spatially-resolved shock and particle velocities, and shock front thicknesses were extracted directly from the radiographs, representing a greatly enhanced scope of data than could be measured in surface-based studies. A statistical interpretation of the measured velocities showed that mean values were in good agreement with those predicted using continuum-level modelling and mixture theory. However, the distribution and evolution of wave velocities and wavefront thicknesses were observed to be intimately linked to the mesoscopic structure of the sample. This Article provides the first detailed experimental insight into the distribution of extreme states within a shocked powder mixture, and represents the first mesoscopic validation of leading theories concerning the variation in extreme pressure-temperature states during the formation of primordial planetary bodies.

show abstract

Section: Discussionsupporting

confidence: 91%

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Rutherford

Chapman

Derrick

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…While acknowledged that a shock wave would not be established for any significant distance ahead of a penetrating bullet in a ceramic target, this experiment was carried out in order to elucidate the way in which a welldefined planar input wave was modified on passage through differing target materials. It is well known that multi-phase materials [17] and in particular granular materials [27,28] As shown in Fig. 9, the 6100 and NS105 materials reached relatively similar peak stresses of 1.93 and 1.84 GPa respectively.…”

Section: Plate-impact Experimentsmentioning

confidence: 80%

On the effects of powder morphology on the post-comminution ballistic strength of ceramics

Appleby-Thomas

Wood

Hameed

et al. 2017

International Journal of Impact Engineering

View full text Add to dashboard Cite

In this paper in order to try and elucidate the effects of particle morphology on ballistic response of comminuted systems, a series of experiments were carried out via the use of powder compacts with differing initial particle morphologies. This approach provided a route to readily manufacture comminuted armour analogues with significantly different microstructural compositions. In this study pre-formed `fragmented-ceramic' analogues were cold-pressed using plasma-spray alumina powders with two differing initial morphologies (angular and spherical). These compacts were then impacted using 7.62-mm FFV AP (Förenade Fabriksverken Armour Piercing) rounds with the subsequent depth-of-penetration of the impacting projectile into backing Al 6082 blocks used to provide a measure of pressed ceramic ballistic response. When material areal density was accounted for via differing ballistic efficiency calculations a strong indication of particle morphology influence on postimpact ceramic properties was apparent. These results were reinforced by a separate small series of plate-impact experiments, whose results indicated that powder morphology had a strong influence on the nature of compact collapse.which have shown that this comminuted materialon further compactionthen provides a residual resisting strength with respect to penetration [7,8,9]. The concept of ballistic strength discussed in this paper is essentially a measure of the ability of armour to resist penetration following an impact event. A number of different approachesboth experimental and computationalhave been adopted to investigate such material response, with the ultimate aim of allowing improved armour (or munition) development from the resultant insight into armour behaviour. Holmquist et al. [10] undertook a series of experiments to investigate the defeat mechanismsfor SiC tiles impacted in a reverse ballistics configuration by 1-mm diameter Au long rods.By monitoring a variety of impact events via a flash X-ray system the authors were able to discern both the onset of the dwell-penetration transition and the nature of subsequent penetration. Interestingly, a non-linear penetration velocity was discerned in all cases, in line with computational simulations. This behaviour was attributed to the multi-stage nature of the ceramic failurewith impacted material being comminuted before penetration occurred.However, in this study the nature of this comminuted materialand its precise contribution to ballistic resistancewere not discussedsomething which will be investigated here.A recent study by Horsfall et al. [11] however, focused to a greater extent on the contribution of fractured materials. In this study Sintox ® FA tiles comprising 95% alumina were explosively comminuted within a confining steel frame. An in-situ Al 7018-T6 witness plate located directly beneath the tile allowed subsequent depth-of-penetration (DOP) testing [1,12, 13,14] without further disturbance of the comminuted material. Further, as a comparison, 80 m pure alumina powder was pressed in...

show abstract

“…At the same mass velocity, porous materials typically have lower wave velocities relative to their fully dense counterparts. Their shock loci often exhibit exaggerated curvature in the U−u plane due to compaction of pores at low particle velocity [6,9,13,31,47,48,49,50]. The combination of lower initial density and wave speed implies lower shock impedance (ρ0U), which represents the slope of the Rayleigh line in the P−u plane.…”

Section: Introductionmentioning

confidence: 99%

Shock-Driven Decomposition of Polymers and Polymeric Foams

Dattelbaum

Coe

2019

Polymers

View full text Add to dashboard Cite

Polymers and foams are pervasive in everyday life, as well as in specialized contexts such as space exploration, industry, and defense. They are frequently subject to shock loading in the latter cases, and will chemically decompose to small molecule gases and carbon (soot) under loads of sufficient strength. We review a body of work—most of it performed at Los Alamos National Laboratory—on polymers and foams under extreme conditions. To provide some context, we begin with a brief review of basic concepts in shockwave physics, including features particular to transitions (chemical reaction or phase transition) entailing an abrupt reduction in volume. We then discuss chemical formulations and synthesis, as well as experimental platforms used to interrogate polymers under shock loading. A high-level summary of equations of state for polymers and their decomposition products is provided, and their application illustrated. We then present results including temperatures and product compositions, thresholds for reaction, wave profiles, and some peculiarities of traditional modeling approaches. We close with some thoughts regarding future work.

show abstract

The influence of morphology on the low- and high-strain-rate compaction response of CeO2 powders

Cited by 21 publications

References 42 publications

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

On the effects of powder morphology on the post-comminution ballistic strength of ceramics

Shock-Driven Decomposition of Polymers and Polymeric Foams

Contact Info

Product

Resources

About