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Interfacial Phenomena and Heat Transfer
ESCI

ISSN 印刷: 2169-2785
ISSN オンライン: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2018025466
pages 129-141

METASTABILITY AND DEFECTS-INDUCED CRITICALITY IN SHOCKED MATERIALS

Yuriy Bayandin
Institute of Continuous Media Mechanics Ural Branch Russian Academy of Sciences 1, Ac. Korolev Street, Perm 614013, Russia
Natalia Saveleva
Institute of Continuous Media Mechanics Ural Branch Russian Academy of Sciences 1, Ac. Korolev Street, Perm 614013, Russia
Oleg Naimark
Institute of Continuous Media Mechanics Ural Branch Russian Academy of Sciences 1, Ac. Korolev Street, Perm 614013, Russia

要約

The multiscale collective properties of defects were studied to establish the interaction of defect-induced metastability, mechanisms of structural relaxation, and plastic flow to explain the self-similar structure of shock wave fronts due to the subjection of material relaxation ability to the set of collective modes of defects. It is shown that the process of plastic relaxation can be considered as a specific type of criticality in an out-of-equilibrium system "solid with defects" and a wide range constitutive models were proposed as the generalization of the Ginzburg–Landau approach in terms of independent field variables describing typical mesoscopic defects (dislocation structures, microshears, microcracks). Original experiments supporting theoretical study of shock wave front evolution by plane shock are presented. The mentioned behavior was discussed as specific relaxation properties that are similar to the first kind of transition in the metastable quasi-static phases, when the delay of the initial transition stage in a homogeneous system can be survived due to non-equilibrium behavior (relaxation) of additional modes and interaction between these modes.


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