Dynamical Models of Plasticity with Nonmonotonic Deformation Curves for Nanomaterials

Nanomaterials are widely used in different fields, such as microelectronics, industry, and nanocomposites, they can exhibit unstable deformation behaviour depending on the strain rates. Under rates of 10−4–10−1 s−1, nanomaterials, unlike quasi-static micromaterials, is characterized by presence rate sensitivity a possible scale phenomenon dynamic plasticity. In this paper, relaxation model plasticity for prediction curves at used. It allows us to comprehensively study effects hardening wide range conditions coarse-grained materials nanomaterials. Considering plastic nanosized samples early stages, dynamical softening, associated with generation new defects, hardening, crucial. The proposed model, using one parameter or classical law an example gold whisker crystals, tungsten single-crystal pillars, single-crystalline Au-Ag alloy nanowires, verified. Calculated sets parameters characteristic time, material, nanomaterials compared. shown that times (100–103 s) greater than nanostructured (10−6–10−4 s). Despite manifestation dynamics single crystal materials, be successfully applied degrees softening.