Shock induced void nucleation during Taylor impact

Chapman, D. J.; Radford, D.D.; Reynolds, M.; Church, P.

doi:10.1007/s10704-005-7151-1

Cited by 22 publications

(14 citation statements)

References 16 publications

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“…They also showed that different conditions exist for ductile damage development in Taylor anvil and rod-on-rod (ROR) impact tests under equivalent velocity resulting in the fact that ductile damage can develop in ROR while it not necessarily can occur in not overdriven Taylor anvil impact test. Similar results were experimentally observed for other metals, [5,6,7].…”

Section: Introductionsupporting

confidence: 90%

Damage development in rod-on-rod impact test on 1100 pure aluminum

Iannitti¹,

Bonora²,

Bourne³

et al. 2017

AIP Conference Proceedings

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Abstract. Stress triaxiality plays a major role in the nucleation and growth of ductile damage in metals and alloys. Although, the mechanisms responsible for ductile failure are the same at low and high strain rate, in impact dynamics, in addition to time resolved stress triaxiality and plastic strain accumulation, pressure also contributes to establish the condition for ductile failure to occur. In this work, ductile damage development in 1100 commercially pure aluminum was investigated by means of rod-on-rod (ROR) impact tests. Based on numerical simulations, using a continuum damage mechanics (CDM) model that accounts for the role of pressure on damage parameters and stochastic variability of such parameters, the impact velocity for no damage, incipient and fully developed damage were estimated. ROR tests at selected velocities were performed and damage distribution and extent were investigated by sectioning of soft recovered samples. Comparison between numerical simulations and experimental results is presented and discussed.

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Section: Introductionsupporting

confidence: 90%

Damage development in rod-on-rod impact test on 1100 pure aluminum

Iannitti¹,

Bonora²,

Bourne³

et al. 2017

AIP Conference Proceedings

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“…High-speed optical photography cannot reveal whether or not this actually happens. However, an X-ray technique has recently shown a dimple, rather smaller than indicated in figure 14a, which does indeed form at the interface in symmetric Taylor impact in an aluminium alloy (Chapman et al 2005a).…”

Section: S½t=ð1katþmentioning

confidence: 91%

“…However, the final stress values calculated from the VISAR data exceed this estimate by as much as three to four times, although it should be pointed out that our knowledge of the other properties (e.g. density and wave speed) of the material becomes less certain as it deforms (Addessio et al 1993;Mayes et al 1993;Worswick & Pick 1995;Chapman et al 2005a). There is no sign of any discrete, steep edges due to elastic wave pulses arriving repeatedly at the rod rear, as suggested by Johnson (1972) and Hohler & Stilp (1990), probably because such waves are too dispersed.…”

mentioning

confidence: 88%

Symmetrical Taylor impact studies of copper

2008

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An integrated investigation of rod-on-rod (symmetric Taylor) impact of annealed copper was conducted using the single-stage gas-gun facility at the Cavendish Laboratory as a validation study of the Armstrong-Zerilli constitutive model, as modified by Goldthorpe. Two main techniques were used for obtaining data from the experiments: high-speed photography (up to 20 million frames s K1 framing rate) and a velocity interferometer system for any reflector (VISAR). The symmetric configuration was used to minimize friction effects and eliminate target indentation seen in classic Taylor tests, where a rod is fired against a massive target block. However, the need for coaxial alignment of the two rods made the experiments considerably more challenging to perform than the classic case. The propagation of plasticity along the rods was monitored using high-speed photography and VISAR. It was found to propagate with a logarithmically decelerating velocity. The rod profiles and VISAR traces can be understood in terms of material properties such as strain hardening. No asymmetry between the responses of the two rods involved (moving and stationary) was observed within the resolution of the techniques employed. A modified Armstrong-Zerilli material model for copper predicted intermediate profiles well, but slightly overestimated the material strength.

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“…Based on the work of Chapman and all, the extend of tensile failure inside the specimen comes from the coalescence of radial release waves at the specimen axis [10]. As suggested in this work, simulations conducted with a critical treshold 02024-p.3 pressure appear to be a mean to generate this bulk tensile failure.…”

Section: Numerical Results With a Tensile Failure Criterionmentioning

confidence: 71%

On the importance of recrystallization to reproduce the Taylor impact specimen shape of a pure nickel

Couque

2015

EPJ Web of Conferences

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Abstract. Taylor tests are a mean to investigate the dynamic plastic and failure behaviour of metals under compression. By taking in account the strengthening occurring at high strain rates, the Taylor final diameter of a pure nickel impacted at 453 m/s have been numerically reproduced by 13%. Through post-mortem observations of the specimen impacted at 453 m/s, a recrystallization process has been found to occur resulting in a softening of the pure nickel. Subsequent numerical simulations taking in account this softening have been found to reduce the difference between experimental and numerical diameter by 10%.

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Shock induced void nucleation during Taylor impact

Cited by 22 publications

References 16 publications

Damage development in rod-on-rod impact test on 1100 pure aluminum

Damage development in rod-on-rod impact test on 1100 pure aluminum

Symmetrical Taylor impact studies of copper

On the importance of recrystallization to reproduce the Taylor impact specimen shape of a pure nickel

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