Influence of Shock-Wave Deformation on the Structure/Property Behavior of Materials

GrayIII, G. T.

doi:10.1007/978-1-4612-0911-9_6

Cited by 62 publications

(33 citation statements)

References 24 publications

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“…Velocimetry measurements are continuum measurements that cannot identify or provide direct insight into the underlying processes. Similarly, shock recovered samples [21] have proven essential in identifying microscopic flaws and residual void distributions, but they are limited by the difficulty of or uncertainty in arresting the damage evolution during high strain-rate dynamic loading. Temporally resolved in situ studies offer the opportunity to potentially answer key questions in the nucleation, early void growth, and final void linkage regimes.…”

Section: Damage: In Situ Void Nucleation and Growthmentioning

confidence: 99%

Shocked materials at the intersection of experiment and simulation

et al. 2008

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Understanding the dynamic lattice response of solids under the extreme conditions of pressure, temperature and strain rate is a scientific quest that spans nearly a century. Critical to developing this understanding is the ability to probe and model the spatial and temporal evolution of the material microstructure and properties at the scale of the relevant physical phenomena-nanometers to micrometers and picoseconds to nanoseconds. While experimental investigations over this range of spatial and temporal scales were unimaginable just a decade ago, new technologies and facilities currently under development and on the horizon have brought these goals within reach for the first time. The equivalent advancements in simulation capabilities now mean that we can conduct simulations and experiments at overlapping temporal and spatial scales. In this article, we describe some of our studies which exploit existing and new generation ultrabright, ultrafast x-ray sources and large scale molecular dynamics simulations to investigate the real-time physical phenomena that control the dynamic response of shocked materials.

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Section: Damage: In Situ Void Nucleation and Growthmentioning

confidence: 99%

Shocked materials at the intersection of experiment and simulation

et al. 2008

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“…If properly designed, the rarefaction release wave relieves the stress to zero in the sample uniaxially and the sample separates from the rings before edge release waves reach it. This technique commonly referred to as momentum trapping [10], has proven effective in preserving uniaxial loading/unloading in numerous recovery and non-recovery experiments [11][12][13][14]. Finite difference calculations by Stevens and Jones [15] demonstrated that if the momentum trapping rings are not properly designed, the plastic work on the sample from radial release waves can be up to a factor of ten higher than that resulting from uniaxial loading/unloading only.…”

Section: Plate Impact Experimentsmentioning

confidence: 99%

“…Furthermore, a diameter to thickness ratio of greater than 7 to I is needed to reduce the radial release effects to acceptably low levels. In the review by Gray [10], a simple centered flow condition calculation is used to determine the approximate minimum width for the momentum trapping rings. After press fitting the sample and rings, the assembly was lapped flat and parallel to better than 5 J.Lm and glued into a target plate.…”

Section: Plate Impact Experimentsmentioning

confidence: 99%

Shock induced multi-mode damage in depleted Uranium

Koller

Cerreta

Gray

2009

DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading

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Recent dynamic damage studies on depleted uranium samples have revealed mixed mode fai,lure mechanisms leading to incipient cracking as well as ductile failure processes. Results show that delamination of inclusions upon compression may provide nucleation sites for damage initiation in the fonn of crack tip production. However, under tension the material propagates cracks in a mixed shear localization and mode-I ductile tearing and cracking. Cracks tips appear to link up through regions of severe, shear dominated plastic flow. Shock recovery experiments were conducted on a 50 mm single stage light gas gun. Serial metallographic sectioning was conducted on the recovered samples to characterize the bulk response of the sample. Experiments show delaminated inclusions due to uniaxial compression without damage propagation. Further results show the propagation of the damage through tensile loading to the incipient state, illustrating ductile processes coupled with mixed mode-l tensile ductile tearing, shear localization, and mode-I cracking in depleted uranium.

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“…This wave results from the impedance mismatch between the sample and the metallic capsule. This situation was pointed out by several authors [4] [5]. The major difficulty of the metallic capsule technique lies in the fact that the metallic container properties are not completely compatible with those of brittle solids.…”

Section: Two-dimensional Numerical Simulationmentioning

confidence: 99%

“…In the past, a lot of designs have been proposed to recover metallic, ceramic or rock samples subjected to planar impact from explosives or gas gun experiments. Several reviews on shock-recovery techniques are presented in [I]- [5].…”

Section: Introductionmentioning

confidence: 99%

Soft Recovery Device For Shocked Brittle Materials

Ponsonnaille¹,

Héreil

1997

J. Phys. IV France

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: A device elaborated to soft recover brittle specimens loaded with a gas gun is presented. The target arrangement has been designed in order to minimize radial release waves in the specimen. A new design of projectile is proposed to avoid parasite recompressions due to further impacts. The optimization of the whole system has been acl~ieved by means of an iterative approach based on both 2D-calculations and experimentation.

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Influence of Shock-Wave Deformation on the Structure/Property Behavior of Materials

Cited by 62 publications

References 24 publications

Shocked materials at the intersection of experiment and simulation

Shocked materials at the intersection of experiment and simulation

Shock induced multi-mode damage in depleted Uranium

Soft Recovery Device For Shocked Brittle Materials

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