An increase of the spall strength in aluminum, copper, and Metglas at strain rates larger than 107 s−1

Moshe, E.; Eliezer, S.; Dekel, E.; Ludmirsky, A.; Henis, Z.; Werdiger, M.; Goldberg, Ira B.; Eliaz, Noam; Eliezer, Dan

doi:10.1063/1.367222

Cited by 116 publications

(86 citation statements)

References 6 publications

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“…The computed cavitation pressure of 19.2 GPa is in good agreement with experimentally measured values [3], results of first-principles calculations [16], and Grady's [17] formula for the theoretical spall strength, which gives a value of 18.2 GPa.…”

Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 70%

“…DOI: 10.1103/PhysRevLett.93.165503 PACS numbers: 61.72.-y, 02.70.-c, 46.15.-x Spallation damage under dynamic tensile loading is characterized by the emergence of distributed microcracks or voids in a narrow region of the material, or spall plane, which may result in the catastrophic failure of the specimen. Spall has been widely studied experimentally by means of gas-gun driven plate-impact tests (e.g., [1,2]), high-intensity, pulsed laser shock generators [3][4][5], and other experimental techniques (cf.[6] and references therein). Observations, however, are for the most part restricted to free-surface velocity measurements and post mortem examination of the specimens and, therefore, are necessarily indirect.…”

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confidence: 99%

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Nanovoid Cavitation by Dislocation Emission in Aluminum

2004

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This Letter is concerned with the determination of the transition paths attendant to nanovoid growth in aluminum under hydrostatic tension. The analysis is, therefore, based on energy minimization at 0 K. Aluminum is modeled by the Ercolessi-Adams embedded-atom method, and spurious boundary artifacts are mitigated by the use of the quasicontinuum method. Our analysis reveals several stages of pressure buildup separated by yield points. The first yield point corresponds to the formation of highly stable tetrahedral dislocation junctions around the surfaces of the void. The second yield point is caused by the dissolution of the tetrahedral structures and the emission of conventional 1 2 h110if111g and anomalous 1 2 h110if001g dislocation loops. DOI: 10.1103/PhysRevLett.93.165503 PACS numbers: 61.72.-y, 02.70.-c, 46.15.-x Spallation damage under dynamic tensile loading is characterized by the emergence of distributed microcracks or voids in a narrow region of the material, or spall plane, which may result in the catastrophic failure of the specimen. Spall has been widely studied experimentally by means of gas-gun driven plate-impact tests (e.g., [1,2]), high-intensity, pulsed laser shock generators [3][4][5], and other experimental techniques (cf.[6] and references therein). Observations, however, are for the most part restricted to free-surface velocity measurements and post mortem examination of the specimens and, therefore, are necessarily indirect.Molecular dynamics (MD) suggests itself as a natural approach for understanding the intrinsic mechanisms underlying the evolution of nanosized voids [7][8][9]. These studies reveal, among other useful insights, that nanovoids exceeding a pressure and temperaturedependent critical size grow by the emission of dislocations and by coalescence with neighboring voids. However, MD is particularly well suited to the study of void growth at very high strain rates, often greatly in excess of those attained experimentally. In addition, reliance on periodic boundary conditions limits the range of elapsed times which can be examined by MD and may introduce undesirable artifacts. Continuum estimates [10] suggest that dynamic effects are indeed negligible for small voids at moderate-to-high strain rates. This points to the need to complement MD studies with a detailed analysis of the equilibrium energy landscape and transition paths accessible to expanding nanovoids.The technique that we use in order to carry out such an analysis is the quasicontinuum (QC) method. QC is a method for systematically coarse-graining lattice statics models. The method starts with the complete atomistic system and appends kinematic constraints which restrict the configuration space of the crystal. The kinematic constraints are based on the selection of representative atoms and the use of finite-element interpolation. In order to avoid full lattice sums, cluster summation rules are also used. By virtue of these rules, only atoms in small clusters surrounding the representative atoms need to be visite...

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Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 70%

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confidence: 99%

Nanovoid Cavitation by Dislocation Emission in Aluminum

2004

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“…Strain rate effects on material failure has been studied a lot [18,19]. With the increase of strain rate, the dynamic fracture mode will change from the intergranular fracture primarily to transgranular fracture.…”

Section: Effect Of Temperature On the Materials Fracture Modementioning

confidence: 99%

High-power laser shock-induced dynamic fracture of aluminum and microscopic observation of samples

Zhang

Huang

Shu

et al. 2015

EPJ Web of Conferences

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Abstract. High-power laser induced shocks generated by "ShenGuang II" laser facility has been used to study spall fracture of polycrystalline aluminum at strain rates more than 106/s. The free surface velocity histories of shock-loaded samples, 150 µm thick and with initial temperature from 293 K to 873 K, have been recorded using velocity interferometer system for any reflector (VISAR). From the free surface velocity profile, spall strength and yield stress are calculated, it demonstrates that spall strength will decline and yield strength increase with initial temperature. The loaded samples are recovered to obtain samples' section and free surface metallographic pictures through Laser Scanning Confocal Microscopy. It is found that there are more microvoids and more opportunity to appear bigger voids near the spall plane and the grain size increases with temperature slowly but smoothly except the sharply change at 893 K (near melting point). Besides, the fracture mechanisms change from mainly intergranular fracture to transgranular fracture with the increase of initial temperature.

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“…Initially, we performed a simulation with an elasto-plastic behavior without damage criteria. Because the pressure load calculated by ESTHER is short and intense, inducing a strong hydrodynamic attenuation [10], it is important to check the relevance of the code to model properly this decay. To achieve this, the experimental speed jump at shock breakout on the free surface velocity is compared to the numerical model.…”

Section: Shock Wave Propagation and Decaymentioning

confidence: 99%

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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An increase of the spall strength in aluminum, copper, and Metglas at strain rates larger than 107 s−1

Cited by 116 publications

References 6 publications

Nanovoid Cavitation by Dislocation Emission in Aluminum

Nanovoid Cavitation by Dislocation Emission in Aluminum

High-power laser shock-induced dynamic fracture of aluminum and microscopic observation of samples

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

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