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The birth of dislocations in shock waves and high-speed friction

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Journal of Computer-Aided Materials Design

Abstract

Large-scale atomistic simulations by non-equilibrium molecular dynamics have revealed that shock-wave loading and high-speed friction between dry metal interfaces have surprising similarities, in that plastic deformation occurs by the violent birth of dislocations. Shock-wave deformation is initiated at the shock front, while in sliding friction, the interface produces dislocations that move first within the plane and then out of it, so as to generate a microstructure that accommodates the slippage. For both shocks and friction in perfect, or nearly perfect, crystals, there is a threshold driving force that needs to be overcome in order to induce plastic flow. Below that threshold, pre-existing extended defects are able to trigger plastic microstructure that resembles the kind seen above the threshold.

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Authors and Affiliations

  1. Theoretical Division, and bApplied Theoretical and Computational Physics Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, U.S.A

    Brad Lee Holian, James E. Hammerberg & Peter S. Lomdahl

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  1. Brad Lee Holian
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  2. James E. Hammerberg
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  3. Peter S. Lomdahl
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Holian, B.L., Hammerberg, J.E. & Lomdahl, P.S. The birth of dislocations in shock waves and high-speed friction. Journal of Computer-Aided Materials Design 5, 207–224 (1998). https://doi.org/10.1023/A:1008641217554

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