Brittle-to-ductile transition in laser-induced spall at ultrahigh strain rate in 6061-T6 aluminum alloy

Gilath, I.; Eliezer, S.; Dariel, M.P.; Kornblit, L.

doi:10.1063/1.99159

Cited by 37 publications

(9 citation statements)

References 3 publications

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“…Experimental data are also available from some commercial aluminum alloys, although the effect of alloying has not been directly addressed. [9,[16][17][18][19] The present investigation aims to address some of the unresolved issues concerning spall strength in aluminum materials. Laser-induced spall experiments were conducted to investigate spall at strain rates in the range of 2 to 5 · 10 6 s -1 , which are faster than rates possible with flyer-plate experiments.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructure on the Spall Failure of Aluminum Materials

Brewer

Dalton

Jackson

et al. 2007

Metall Mater Trans A

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Laser-shock-induced spall failure is studied in thin aluminum targets at strain rates from 2 to 5 · 10 6 s -1 . Targets were prepared from high-purity aluminum in the recrystallized condition and a low-impurity aluminum alloy containing 3 wt pct magnesium in both recrystallized and cold-rolled conditions. The effects of material and microstructure on spall fracture morphology are investigated. Recrystallized pure aluminum produced spall fracture surfaces characterized by transgranular ductile dimpling. Recrystallized aluminum-magnesium alloy with a 50-lm grain size produced less ductile spall surfaces, which were dominated by transgranular fracture, with some isolated transgranular ductile dimpling at fast strain rates. Transgranular ductile dimpling regions disappeared in recrystallized alloy specimens with a 23-lm grain size tested at faster rates. Cold-rolled alloy material produced spall failure surfaces consisting of brittle intergranular and transgranular fractures. Measured spall strength increases with increasing ductile fracture character. Spall failure preferentially follows grain boundaries, making grain size an important factor in spall fracture surface character.

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Section: Introductionmentioning

confidence: 99%

Influence of Microstructure on the Spall Failure of Aluminum Materials

Brewer

Dalton

Jackson

et al. 2007

Metall Mater Trans A

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“…19 It is important to examine dynamic failure including spall fracture of steels under hypervelocity impact of low-density materials as well as higher density man-made space debris having macroscopic sizes. 2 Steel materials are also of interest in connection with martensitic transformation, 20 formation of adiabatic shear band, 21 and ductile-brittle transition 22 under dynamic highpressure loading. The dynamic phase transition from the ␣-phase ͑bcc͒ to the -phase ͑hcp͒ in pure iron and ferritic steels has been reported to occur at around 13 GPa.…”

Section: Introductionmentioning

confidence: 99%

Dynamic failure of steel under hypervelocity impact of polycarbonate up to 9 km/s

Moritoh

Matsuoka

Ogura

et al. 2003

Journal of Applied Physics

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Metallurgical analysis and computer simulation of a solid steel sphere under shock loading AIP Conf.We performed hypervelocity impact experiments on SS400 steel with a polycarbonate projectile at velocities up to 9 km/s. Spall fracture damages were observed near a rear surface of the impacted target. The microstructure and microdamages were examined using optical microscopy and scanning electron microscopy. The ␣Ϫ phase transition region was observed near the crater. Cracks parallel to the impact direction were observed below the crater, and radial cracks grew from the ␣Ϫ phase interface at high velocity impact tests, especially above 6 km/s. Cleavage was the dominant mechanism for a spall fracture surface, and ductile fracture structures were also observed at the edge of spall plane. Geometric spall behaviors were well reproduced by numerical simulations using a hydrocode. These simulation results also showed that the cracks below the crater would be due to dynamic tensile stresses. The calculated results using the value of 13 GPa as the transition pressure showed that the duration necessary for the phase transition is about 150 ns for impact velocity of 8.8 km/s.

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“…Recently, laser induced shock waves have also been applied for studying spallation effects [1][2][3][4][5][6][7]. Absorption of laser radiation by a target material takes place within a very thin layer resulting in a steep temperature gradient which induces ablation of the material as plasma into the vacuum.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of laser produced shock waves is the ultrahigh strain rate obtained which allows one to study material behaviour under dynamic conditions [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Spall Behaviour of Carbon Epoxy Unidirectional Composites as Compared to Aluminum and Iron

Gilath

Eliezer

Shkol'nik

1990

Journal of Composite Materials

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The spall behaviour at ultrahigh strain rate ( & e p s i l o n ; & s i m ; 10 7 sec -1 ) of carbon/epoxy unidirectional composites was compared to aluminum and iron using short pulsed laser induced-shock waves. A linear dependence was obtained between plasma ablation pressure for threshold spall conditions and sample thickness.The threshold for spall damage was estimated to be 1.5 kbar for carbon epoxy unidirectional composites, 21 kbar for aluminum and 54 kbar for iron. KEY WORDS: Spall damage, composites, laser induced shock waves, ultrahigh strain rate.

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Brittle-to-ductile transition in laser-induced spall at ultrahigh strain rate in 6061-T6 aluminum alloy

Cited by 37 publications

References 3 publications

Influence of Microstructure on the Spall Failure of Aluminum Materials

Influence of Microstructure on the Spall Failure of Aluminum Materials

Dynamic failure of steel under hypervelocity impact of polycarbonate up to 9 km/s

Spall Behaviour of Carbon Epoxy Unidirectional Composites as Compared to Aluminum and Iron

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