Dynamic Failure of Materials. Volume 1 - Experiments and Analyses

Antoun, T.; Seaman, Lynn; Curran, D. R.

doi:10.21236/ada362713

Cited by 10 publications

(14 citation statements)

References 84 publications

(116 reference statements)

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“…The peak pressure calculated from this measurement is 18 GPa The decrease in the velocity profile is characteristic of the time dependence of the pressure generated by high explosives. The oscillation superimposed on the velocity profile is caused by a "spall" layer, 11 formed when tlie first part of tte shock wave reflects off sample as a rarefaction wave and collides with later parts of shock wave from the explosive. This causes tension in the metal and leads to material failure.…”

Section: Explosive Experiments Resultsmentioning

confidence: 99%

Infrared images of shock-heated tin

et al. 2005

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High-resolution, gated infrared images were taken of tin samples shock heated to just below the SOS K melting point Sample surfaces were eiurapoUshed or dian^ 10 mm. A high explosive in contact with a 2-mm-thick tin sample induced a peak sample stress of 18 GPa. interferometer data from similarly-driven tin shots indicate that immediately after shock breakout the samples spall near the free (imaged) surface with a scab thickness of about 0.1 mm Images were taken with gate widths of 0.2 to 0.S us and start times ranging from 0.3 to 1.5 us after shock breakout. The camera and experimental techniques were described previously. (2002)]. Infrared radiation (3 to 5 urn) from the sample was imaged onto a gated InSb camera array with lens systems capable of resolving features on the order of 0.1 mm. Assuming a dynamic emissivity of 0.1, calculated temperatures were around 700 K for the millimeter-sized hot spots and 450 K in the surrounding area. The images showed different amounts and physical distribution of hot spots. Although there was a trend to more and higher-temperature hot spots with larger grain size, the hot spots do not appear to map directly to individual gain shapes or boundaries.

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Section: Explosive Experiments Resultsmentioning

confidence: 99%

Infrared images of shock-heated tin

et al. 2005

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“…This fact is experimentally illustrated in femtosecond regime with the experimental data on Fig. 2(a): from one VISAR signal, it is possible to extract information about spallation strength and strain rate by measuring respectively the velocity pullback amplitude Δu and duration Δt (See Equations (5) and (6)) [12].…”

Section: Damage Evolution With Strain Ratementioning

confidence: 88%

Study of spallation by sub-picosecond laser driven shocks in metals

Cuq‐Lelandais

Boustie

Soulard

et al. 2010

EPJ Web of Conferences

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Abstract. Spallation induced by a laser driven shock has been studied for two decades on time scales of nanosecond order. The evolution of laser technologies now provides access to sources whose pulse duration is under the picosecond, corresponding to characteristic times of numerous microscopic phenomena. In this ultra-short irradiation regime, spallation experiments have been performed with time-resolved measurements of the free surface. In this solicitation type, damage occurs at small scale, leading to micrometric spalls. The VISAR measurements have been complemented with post-test observations and microtomography and compared with numerical simulations to check the models consistency of the laser-matter interaction, shock wave propagation and the dynamic damage criteria ability to reproduce spallation at this ultra-short time scale, inducing strong tensile stress states at very high strain rates.

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“…Only the curve recess which occurs during the release in c and d are not reproduced numerically. They are characteristic of rupture by spallation [11] and can only be simulation by adding a damage model. This is going to be discussed in the next paragraph.…”

Section: Shock Wave Propagation and Attenuationmentioning

confidence: 99%

Behaviour of metals at ultra-high strain rate by using femtosecond laser shockwaves

Cuq‐Lelandais

Boustie

Berthe

et al. 2012

EPJ Web of Conferences

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Abstract. The mechanical behavior of materials under extreme conditions can be investigated by using laser driven shocks. Actually, femtosecond (fs) technologies allow to reach strong pressures over a very fast duration. This work is dedicated to characterize metals behavior in this ultra-short mode, (aluminum, tantalum), leading to an extreme dynamic solicitation in the target (>10 7 s −1 ). The study includes the validation of experimental results obtained on the LULI 100TW facility by comparison with numerical model. Three modeling steps are considered. First, we characterize the pressure loading resulting from the fs lasermatter interaction, different from what happens in the classical nanosecond regime. Then, the shock wave propagation is observed through the target and particularly its pressure decay, strong in this regime. The elastic-plastic influence on the shock attenuation is discussed, particularly for tantalum which has a high elastic limit. Dynamic damage appears with spallation. Experimentally, spallation is characterized by VISAR measurements and post-test observations. Shots with different thicknesses have been carried out to determine the damage properties in function of strain rate. We show in this work that a simple instantaneous rupture criterion is not sufficient to reproduce the damage induced in the sample. Only the Kanel model, which includes damage kinetics, is able to reproduce experimental data (VISAR measurements, spall thickness). A generalization of this model to any strain rate can be performed by confronting these results to other shock generators data (ns laser driven shocks, plate impacts). One remarkable result is that every Kanel parameters follows a power law with strain rate in dynamic regime (10 5 to 10 8 s −1 ) for both aluminum and tantalum.

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Dynamic Failure of Materials. Volume 1 - Experiments and Analyses

Cited by 10 publications

References 84 publications

Infrared images of shock-heated tin

Infrared images of shock-heated tin

Study of spallation by sub-picosecond laser driven shocks in metals

Behaviour of metals at ultra-high strain rate by using femtosecond laser shockwaves

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