Spall strength of niobium and molybdenum

Cotton, M. M.; Millett, J. C. F.; Whiteman, G.; Park, Nigel

doi:10.1063/1.3686454

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The estimated spall strengths for both NR and TR Cu-Nb nanocomposites are similar, ~0.893 GPa and 0.844 GPa, respectively. Also, it is interesting to note that the spall strength of the ARB Cu-Nb composites is less than the spall strength of coarsegrained Cu (~1.3 to 1.5 GPa) [27,34] and Nb (~4 GPa) [35] under similar planar shock loading conditions. The lower macroscopic spall strength in Cu-Nb composites may be explained by two considerations.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Rolling Schedule on the Dynamic Properties of Accumulatively Roll Bonded Nano-Layered Cu-Nb

Cerreta

Han

Mara

et al. 2014

KEM

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Cu-Nb nanolayered material was produced through an accumulative roll bonding (ARB) technique. Using this technique, two different rolling schedules were employed to produce a normal and transverse rolled material. This resulted in specimens with differing microstructures within the 135nm thick nanolayers and interface structures between the layers. The dynamic response of these bulk Cu-Nb nanocomposites was then investigated under planar shock loading. It was observed in dynamically fractured specimens that the characteristics of ductile failure features formed on the fracture surface after dynamic loading were dependent upon the processing route of the nanocomposite. Specifically, grain shape differences due to dissimilar rolling passes are linked with differences in the failure response, particularly kinetics of fracture. In addition, incipient failure immediately below the primary fracture surface was also observed. Numerous nanovoids were nucleated and aligned linearly in the middle of Cu layers within the shocked Cu-Nb nanocomposites. These observations indicate relative stability of Cu-Nb interfaces produced by the ARB methods utilized in this study under dynamic loading conditions.

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Section: Resultsmentioning

confidence: 99%

The Influence of Rolling Schedule on the Dynamic Properties of Accumulatively Roll Bonded Nano-Layered Cu-Nb

Cerreta

Han

Mara

et al. 2014

KEM

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“…In the following two figures, we present free surface velocity traces, measured using HetV. In particular, we are interested in the rise time of the inelastic part of the pulse, although as can be seen, the spallation response was also captured, and is discussed in a parallel paper [4]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In this report, we examine the shock induced mechanical response of body centred cubic metals, including tungsten, tantalum, niobium and molybdenum. In a parallel paper we also investigate the spallation response of niobium and molybdenum as well [4].…”

Section: Introductionmentioning

confidence: 99%

Shock response of body centered cubic metals

Millett

Cotton

Whiteman

et al. 2012

AIP Conference Proceedings

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Invariability of rate dependences of normalized flow stress in niobium and molybdenum under conditions of shock compression

Zaretsky

Kanel

2016

Journal of Applied Physics

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The evolution of elastic-plastic shock waves has been studied in pure molybdenum and niobium at normal and elevated temperatures over propagation distances ranging from 0.03 to 5 mm. The experiments revealed that annealing of the metals substantially increases their Hugoniot elastic limits and, to a lesser degree, their spall strengths. Variations in the resistance of both the metals to fracture in tension with the test temperature can be described as modest. Measuring the decay of the elastic precursor waves with a propagation distance in the two metals has allowed a determining of the relationships between a flow stress τ and an initial plastic strain rate γ̇p. It was found that, at the plastic strain rates greater than 3÷4×104s−1, the temperature sensitivity of the transient values of τ is much lower than that at the strain rates below this range. The τ(γ̇p) data normalized on shear moduli of the metals have been approximated by simple functions that, despite substantial differences between the moduli and yield stresses, were found to be virtually identical for the two metals.

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Spall strength of niobium and molybdenum

Cited by 4 publications

References 6 publications

The Influence of Rolling Schedule on the Dynamic Properties of Accumulatively Roll Bonded Nano-Layered Cu-Nb

The Influence of Rolling Schedule on the Dynamic Properties of Accumulatively Roll Bonded Nano-Layered Cu-Nb

Shock response of body centered cubic metals

Invariability of rate dependences of normalized flow stress in niobium and molybdenum under conditions of shock compression

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