1998
DOI: 10.1063/1.367222
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An increase of the spall strength in aluminum, copper, and Metglas at strain rates larger than 107 s−1

Abstract: Measurements of the dynamic spall strength in aluminum, copper, and Metglas shocked by a high-power laser to hundreds of kilobars pressure are reported. The strain rates in these experiments are of the order of 10 7 s Ϫ1 , which cannot be reached in impact experiments. The free-surface velocity behavior associated with spallation is characterized by oscillations caused by the reverberations of the spall layer. An optically recording velocity interferometer system was developed to measure the free-surface veloc… Show more

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Cited by 114 publications
(86 citation statements)
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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%
See 1 more Smart Citation
“…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.…”
mentioning
confidence: 99%
“…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%
“…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%