Search Results - "Kositski, Roman"

Employing molecular dynamics to shed light on the microstructural origins of the Taylor-Quinney coefficient by Kositski, Roman, Mordehai, Dan

“…The Taylor-Quinney coefficient (TQC) or the cold-work conversion factor is the fraction of external work that is converted into heat during the plastic…”
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Role of dislocation pile-ups in nucleation-controlled size-dependent strength of Fe nanowires by Kositski, Roman, Mordehai, Dan

“…We studied the strength of Fe faceted nanowires under diametrical compression using molecular dynamics simulations. We show that a series of consecutive events…”
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Depinning-controlled plastic deformation during nanoindentation of BCC iron thin films and nanoparticles by Kositski, Roman, Mordehai, Dan

“…Nanoindentation is commonly employed to study mechanical properties of metallic specimen. In recent years, the use of this technique has been extended to study…”
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Transitioning a unidirectional composite computer model from mesoscale to continuum by Chocron, Sidney, Zaera, Ramón, Walker, James, Brill, Alon, Kositski, Roman, Havazelet, Doron, Heisserer, Ulrich, Werff, Harm van der

“…Ballistic impact on composites has been a challenging problem as seen in the abundant literature about the subject. Continuum models usually cannot properly…”
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Deep indentation and terminal ballistics of polycarbonate by Rosenberg, Zvi, Kositski, Roman

“…•We used deep indentation tests to predict the resistance to penetration of polycarbonate by rigid projectiles.•Strain rate hardening has an insignificant…”
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The hole diameter in metallic plates impacted by hypervelocity projectiles by Rosenberg, Zvi, Kositski, Roman

“…•Numerical simulations are compared with models for crater diameter in semi-infinite metallic targets impacted by hypervelocity projectiles.•A numerically…”
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Modeling the penetration and perforation of concrete targets by rigid projectiles by Rosenberg, Zvi, Kositski, Roman

“…We present an analytical approach for the penetration and perforation processes of concrete targets by rigid projectiles. We first derive an empirical relation…”
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The effective strength of metallic plates perforated by rigid projectiles by Rosenberg, Zvi, Kositski, Roman, Malka-Markovitz, Alon

“…•Perforation tests performed by 7.62 mm projectile on 6 mm to 8 mm metallic plates.•High strain rate Kolsky bar compressive experiments performed.•Numerical…”
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Nucleation‐Controlled Plasticity of Metallic Nanowires and Nanoparticles by Mordehai, Dan, David, Omer, Kositski, Roman

“…Nanowires and nanoparticles are envisioned as important elements of future technology and devices, owing to their unique mechanical properties. Metallic…”
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On the perforation of aluminum plates by 7.62 mm APM2 projectiles by Rosenberg, Zvi, Kositski, Roman, Dekel, Erez

“…•A numerically-based model accounting for ballistic limit velocities for aluminum plates.•A model for predicting the effect of jacket on the ballistic limit…”
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Shear relaxation behind the shock front in 110 molybdenum – From the atomic scale to continuous dislocation fields by Kositski, Roman, Steinberger, Dominik, Sandfeld, Stefan, Mordehai, Dan

“…[Display omitted] •Uniaxial shock wave propagation in a single crystal Mo was studied.•From simulations the dislocation lines and densities were obtained and…”
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Shear relaxation behind the shock front in 1 1 0 molybdenum – From the atomic scale to continuous dislocation fields by Kositski, Roman, Steinberger, Dominik, Sandfeld, Stefan, Mordehai, Dan

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A comment on “Constant deceleration approach for the penetration analysis of rigid projectiles into concrete targets: Revisited” by D.Z. Yankelevsky and V.R. Feldgun, Int. J. Prot. Struct., pp. 1–18 (2020) by Rosenberg, Zvi, Dekel, Erez, Kositski, Roman

“…The purpose of this Comment is to highlight several inaccuracies in the recently published paper of Yankelevsky and Feldgun, which criticizes our work on…”
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Inferring the ballistic resistance of thick targets from static deep indentation tests by Rosenberg, Zvi, Malka-Markovitz, Alon, Kositski, Roman

“…The aim of this work is to demonstrate that one can derive the value of the dynamic resistive stress, which a given target exerts on a rigid projectile, by…”
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Penetration mechanics of rigid projectiles impacting metallic and concrete targets—A summary of our work by Rosenberg, Zvi, Dekel, Erez, Vayig, Yaniv, Kositski, Roman, Malka-Markovitz, Alon

“…The physical mechanisms operating during the penetration and perforation of metallic and concrete targets by rigid projectiles are reviewed in this paper. The…”
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The penetration of limestone targets by rigid projectiles: Revisited by Rosenberg, Zvi, Vayig, Yaniv, Malka-Markovitz, Alon, Kositski, Roman

“…We reanalyze the results from a set of terminal ballistics tests in which large limestone targets were impacted by similarly shaped rigid projectiles having…”
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Cross-Split of Dislocations: An Athermal and Rapid Plasticity Mechanism by Kositski, Roman, Kovalenko, Oleg, Lee, Seok-Woo, Greer, Julia R., Rabkin, Eugen, Mordehai, Dan

“…The pathways by which dislocations, line defects within the lattice structure, overcome microstructural obstacles represent a key aspect in understanding the…”
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Viscoelastic-Viscoplastic Strength Model for PBX by Kositski, Roman

“…We present a material (strength) model for describing the deformation of PBX under quasistatic mechanical and thermal loadings. It is a…”
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Shear relaxation behind the shock front in $\langle$110$\rangle$ Molybdenum - From the Atomic Scale to Continuous Dislocation Fields by Kositski, Roman, Steinberger, Dominik, Sandfeld, Stefan, Mordehai, Dan

“…Computational Materials Science. 149. 125-133. (2018) In this work we study shock-induced plasticity in Mo single crystals, impacted along the crystal…”
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