The effect of particle size on the shock compaction of a quasi-mono-disperse brittle granular material

Neal, William; Chapman, David J.; Proud, W. G.

doi:10.1063/1.3686553

Cited by 13 publications

(7 citation statements)

References 4 publications

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“…The effect of strain rate on the pressure-volumetric strain relationship has been investigated using thicker and stronger steel confining cylinders (Neal, 2012;Vogler et al, 2007). This research did not utilise the data from any external strain gauging of the confining cylinder and assumed pure uniaxial strain.…”

Section: Rate Effectsmentioning

confidence: 99%

Gauged reactive confinement cell for determination of concrete triaxial properties

Sheridan¹,

Pullen

2014

Magazine of Concrete Research

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A simple experimental method for determining a set of triaxial properties for concrete and other geologically based materials such as rock and soil is described. The method involves the uniaxial loading of a cylindrical material specimen that is radially confined by a steel tube. The steel tube is lined to reduce friction and is externally strain gauged to determine axial and circumferential strains. Elastic thick-cylinder theory is then applied to determine the radial stresses and strains induced in the specimen during uniaxial loading. The specimen load conditions are approximately those of uniaxial strain, with lateral strains being two orders of magnitude lower than the axial strains. The test is capable of directly outputting pressure against volumetric strain and stress difference against mean effective stress in a form that, within a single test, is suitable for evaluation of the parameters for hydrocode material models that can be employed in military equipment performance assessments, where triaxial compressive stresses can be significantly greater than those typically resulting from structural service loads. This paper describes specimen preparation, the test set-up, the test process and associated data capture, the theory of the stress analysis and the application of the test data to simple hydrocode material models. A database of concrete, rock and soil properties has been generated using the gauged reactive confinement (GREAC) cell and the method has also been compared with the more traditional active confinement triaxial test method. The issues of strain rate are also addressed. Notation ainside radius of GREAC cell steel confining cylinder a 0 initial undeformed inside radius of GREAC cell steel confining cylinder b outside radius of GREAC cell steel confining cylinder E Young's modulus of steel F axial load on GREAC cell specimen P pressure within GREAC cell specimen å 1 axial strain in GREAC cell specimen å 3 lateral strain in GREAC cell specimen å AE axial strain in GREAC cell steel confining cylinder å h hoop strain in GREAC cell steel confining cylinder íPoisson's ratio of steel ó 1 axial stress in GREAC cell specimen ó 3 lateral stress in GREAC cell specimen ó AE axial stress in GREAC cell steel confining cylinder ó h hoop stress in GREAC cell steel confining cylinder ó r radial stress in GREAC cell steel confining cylinder ó y yield stress in GREAC cell specimen ô shear stress within GREAC cell specimen ö shear strain within GREAC cell specimen

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Section: Rate Effectsmentioning

confidence: 99%

Gauged reactive confinement cell for determination of concrete triaxial properties

Sheridan¹,

Pullen

2014

Magazine of Concrete Research

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“…In his doctoral thesis and associated publications [9,10], Neal studied quartz sand and glass microspheres were studied. The glass microspheres obtained in a range of sieve fractions, 63-75 μm, 180-212 μm, 425-500 μm, a polydisperse microsphere mixture and finally quartz sand from the US Air force Research Laboratory, Eglin Air force Base, Florida.…”

Section: Methodsmentioning

confidence: 99%

“…The evolution of this precursor wave was studied with respect to stress level and bed thickness [9,10]. The results of variation in stress level are shown in figure 3(a) which it typical for all the quartz sphere studies.…”

Section: Stress Transmission Through the Skeletal Structure Of The Mamentioning

confidence: 99%

“…At stresses below 1.4 GPa the pre-cursor is clearly visible, while at higher levels it is not resolved and a single rising shock wave is seen. Studies conducted by Neal et al [9,10] indicated that the wave speed, within experimental error, is either approximately fixed or decreases slightly with stress, while that of the following wave increases rapidly. The stress value associated with this wave increases with decreasing particle size, 0.3 GPa for 180-212 μm and 0.15 GPa for 425-500 μm, this can be explained by the fracture strength of particles being higher the smaller the particle.…”

Section: Stress Transmission Through the Skeletal Structure Of The Mamentioning

confidence: 99%

“…Neal [9] estimates that a thickness of ~27 particles is needed to achieve a steady precursor wave implying that wave steadiness had only been achieved in the 63-75 micron particle samples he studied. For this particle size and considering the rise times seen in figure 3(a) these wave profiles are associated with zones many tens of particles thick.…”

Section: Stress Transmission Through the Skeletal Structure Of The Mamentioning

confidence: 99%

See 2 more Smart Citations

The stress and ballistic properties of granular materials

Proud

Chapman

Eakins

2017

AIP Conference Proceedings

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Abstract. Granular materials are widespread in nature and in manufacturing. Their particulate nature gives a compressive strength of a similar order of magnitude as many continuous solids, a vanishingly small tensile strength and variable shear strength, highly dependent on the loading conditions. Previous studies have shown the effect of composition, morphology and particle size, however, compared to metals and polymers, granular materials are not so well understood. This paper will present some recent results for granular materials, placing these within the wider context. Two areas will be dealt with (i) the effect of the skeletal strength of the material and (ii) the displacements associated with ballistic impact. One clear observation is the similarity of behavior of quartz-sands in compression across a range of particle size. However, the precise pathway of compression is strongly dependent on the initial conditions e.g. density and connectivity within the granular bed, as emphasized by some data for quasi-static compression of sand. To fully embrace the range of behaviours seen requires the development of a suitable parameter to describe the material, the paper concludes with a discussion of one of those approaches.

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Rapid compaction of granular material: characterizing two- and three-dimensional mesoscale simulations

Borg

Vogler

2012

Shock Waves

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The effect of particle size on the shock compaction of a quasi-mono-disperse brittle granular material

Cited by 13 publications

References 4 publications

Gauged reactive confinement cell for determination of concrete triaxial properties

Gauged reactive confinement cell for determination of concrete triaxial properties

The stress and ballistic properties of granular materials

Rapid compaction of granular material: characterizing two- and three-dimensional mesoscale simulations

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