Special features of spalling failure of specimens of steel, copper, and lead in loading with sliding detonation waves

Огородников, В. А.; Tyun'kin, E. S.; Khokhlov, A. A.; Grigor'ev, V. A.; Mishukov, V. V.

doi:10.1007/bf01529298

Cited by 3 publications

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“…Additional experiments by Drummond [9] and more recently Ogorodnikov et al [10] has led to an increased emphasis on research in HE-driven spallation due to oblique loading via sliding detonation waves.…”

Section: Introductionmentioning

confidence: 99%

Influence of sweeping detonation-wave loading on shock hardening and damage evolution during spallation loading in tantalum

Gray

Hull

Livescu

et al. 2012

EPJ Web of Conferences

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Abstract.Widespread research over the past five decades has provided a wealth of experimental data and insight concerning the shock hardening, damage evolution, and the spallation response of materials subjected to square-topped shock-wave loading profiles. However, fewer quantitative studies have been conducted on the effect of direct, in-contact, high explosive (HE)-driven Taylor wave (unsupported shocks) loading on the shock hardening, damage evolution, or spallation response of materials. Systematic studies quantifying the effect of sweeping-detonation wave loading are yet sparser. In this study, the shock hardening and spallation response of Ta is shown to be critically dependent on the peak shock stress and the shock obliquity during sweeping-detonation-wave shock loading. Sweeping-wave loading is observed to: a) yield a lower spall strength than previously documented for 1-D supported-shock-wave loading, b) exhibit increased shock hardening as a function of increasing obliquity, and c) lead to an increased incidence of deformation twin formation with increasing shock obliquity.

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Section: Introductionmentioning

confidence: 99%

Influence of sweeping detonation-wave loading on shock hardening and damage evolution during spallation loading in tantalum

Gray

Hull

Livescu

et al. 2012

EPJ Web of Conferences

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“…The spall strength, the process of nucleation, growth, and coalescence of the microvoids are studied systematically to reveal the mechanism of spall damage. Moreover, spall fracture also occurs under explosive loading, which has been studied since 1960s [7][8][9] . But in this case, it is quite different from that in the plate impact experiment.…”

Section: Introductionsmentioning

confidence: 99%

Spalling behavior of Cu plate under sliding detonation loading

Fan¹,

Liu²,

Guo³

et al. 2017

AIP Conference Proceedings

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Abstract.We study the fracture behavior of a Cu plate under sliding detonation loading using wire explosion technique. Both Doppler Pins Systems (DPS) and Scanning Electron Microscope (SEM) are employed in the experiments to study the velocity of the free surface and the microstructure of the recovered samples. A novel spalling phenomenon is substantially observed. Unlike the flyer impact method, the typical spalling signals are not currently obtained in the velocity curves. But the microstructure images of recovered samples show obvious spalling characters. Several microholes are created and arranged along the direction perpendicular to the loading axis. Moreover, these holes all aline within a wide band with about 1mm width. This is quite different from the case in the flyer impact experiment, in which the microholes all aline in a very narrow region. This is caused by the complex tensile stress state in the sample initiated by the explosive loading. More interestingly, all the microholes are initiated at the grain boundary and the grain size is much smaller in the band, especially at the edge of the big holes. These results may reveal the mechanism of the nucleation and the growth process for the microholes.

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On the influence of loading profile upon the tensile failure of stainless steel

Gray

Bourne

Henrie

2007

Journal of Applied Physics

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A material placed in direct contact with a high explosive experiences a Taylor wave (triangular-shaped) shock loading profile. While a large number of studies have probed the structure, properties, and tensile response of materials subjected to square-topped shock loading pulses histories, few studies have systematically quantified the influence of shock-wave profile shape on material response. Samples of 316L stainless steel were shock loaded to peak stresses of 6.6, 10.2, and 14.5 GPa to examine the influence of square-topped and triangular (Taylor wave)-shaped pulse loading on the dynamic tensile behavior (spallation). The 316L SS samples were loaded with a square-topped pulse to each peak shock stress, using a pulse duration of 0.9 μs. They displayed increasing incipient spallation damage with increasing peak stress. Samples loaded to the peak shock stresses of 6.6 and 10.2 GPa with a Taylor-wave loading pulse (which immediately unloads the sample after the peak Hugoniot stress is achieved) exhibited no damage. Only the 14.5 GPa Taylor pulse shocked sample exhibited both a pull-back signal and incipient damage following tensile loading. The damage evolution in the square-topped shocked samples was found to be a mixture of void and strain localization damage, the void fraction increasing with peak shock amplitude. With the Taylor-wave loading profile of amplitude 14.5 GPa, a high incidence of shear localization and low incidence of void formation was observed. Detailed analysis of the damage evolution as a function of shock pulse shape revealed that a nominally equivalent level of incipient damage was obtained using a Taylor-wave or square-topped loading pulse when a similar rear sample surface stress-time total impulse was applied. In order to induce equivalent damage with the two pulse shapes, the impulse applied needed to be nominally matched. For this to occur, the Taylor-wave profile required twice the amplitude of the square one and the durations of each pulse needed to be appropriately scaled. Detailed metallographic, microtextural, and void shape and size analyses of the damage evolution are presented as a function of the inferred loading pulse shape and the peak Hugoniot stress.

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Special features of spalling failure of specimens of steel, copper, and lead in loading with sliding detonation waves

Cited by 3 publications

References 0 publications

Influence of sweeping detonation-wave loading on shock hardening and damage evolution during spallation loading in tantalum

Influence of sweeping detonation-wave loading on shock hardening and damage evolution during spallation loading in tantalum

Spalling behavior of Cu plate under sliding detonation loading

On the influence of loading profile upon the tensile failure of stainless steel

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