Comparative Analysis of Uniaxial Strain Shock Tests and Taylor Tests for Armor and Maraging Steels

Mescheryakov, Yu. I.; Zhigacheva, N. I.; Petrov, Yu. V.; Divakov, A. K.; Cline, C.F.

doi:10.1063/1.1780310

Cited by 1 publication

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“…At the moment, real-time visual registration of the structural transition during high-velocity deformation of solids does not seem possible because the time of the processes under study is too short. Nevertheless, there is some indirect evidence of the existence of structural transitions of this kind: 1) the presence of the mass velocity dispersion at mesolevel 2 (see [1]) registered in the case of dynamic deformation of beryllium and Armco iron [19] and also tantalum [20]; 2) material fragmentation observed in the spall zone with an exceeded threshold stress of the structural transition in high-tensile steels and other structural materials [21,22]. There is no such fragmentation if the stress on the plastic front is smaller than a certain value at which a mass velocity defect appears on the compression pulse plateau.…”

Section: Experimental Technique and Resultsmentioning

confidence: 99%

Effect of the grain size on the macroscopic response of aluminum to shock loading

Meshcheryakov

Divakov

Zhigacheva

et al. 2007

J Appl Mech Tech Phy

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Shock tests of two lots of a 1420 aluminum-lithium alloy are performed. The mean grain size is 24 μm in the first lot and 1.6 μm in the second lot obtained by the method of equal-channel angular pressing. Two characteristics of dynamic strength of the material were determined in experiments on the high-velocity impact of flat samples: threshold of dynamic stability with respect to compression on the fore front of the compression pulse and spall strength of the material. The materials of both types have an identical threshold of dynamic stability with respect to compression, whereas the spall strength of the microcrystalline alloy is 20% greater than the spall strength of the polycrystalline alloy. The reason is the consumption of energy on structure formation in the coarse-grain material in passing to a larger-scale structural level (in the case with a fine-grain material, such a structure is available in the initial state). The experiments reveal the presence of a second plastic front whose amplitude is approximately 10% of the first plastic front.

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