论文标题

无序固体中可塑性的结构弹性塑性性(步骤)模型

Structuro-elasto-plasticity (StEP) model for plasticity in disordered solids

论文作者

Zhang, Ge, Xiao, Hongyi, Yang, Entao, Ivancic, Robert J. S., Ridout, Sean A., Riggleman, Robert A., Durian, Douglas J., Liu, Andrea J.

论文摘要

固体对变形的响应的弹性塑料晶格模型通常仅通过分配给每个位点的局部屈服应变隐式结合结构。但是,局部屈服应变可能会因系统中附近甚至遥远的塑料事件而发生变化。这种相互作用是理解现象的关键,例如一个塑料事件可以触发另一个事件的雪崩,导致一系列事件,但通常在弹性塑性模型中被忽略。为了包括相互作用,可以计算给定颗粒系统的局部收益率应变并遵循其演变,但这很昂贵,需要了解粒子相互作用,这通常很难从实验中提取。取而代之的是,我们引入了使用机器学习获得的结构数量“柔软度”,以与迫在眉睫的塑料重排相关。我们表明,柔软度也与局部产量应变相关。我们结合了柔软度以构建一个“结构弹性塑性”模型,该模型可定量地重现粒子模拟的结果,以确认我们捕获了局部结构,可塑性和弹性对材料响应的影响的影响。

Elastoplastic lattice models for the response of solids to deformation typically incorporate structure only implicitly via a local yield strain that is assigned to each site. However, the local yield strain can change in response to a nearby or even distant plastic event in the system. This interplay is key to understanding phenomena such as avalanches in which one plastic event can trigger another, leading to a cascade of events, but typically is neglected in elastoplastic models. To include the interplay one could calculate the local yield strain for a given particulate system and follow its evolution, but this is expensive and requires knowledge of particle interactions, which is often hard to extract from experiments. Instead, we introduce a structural quantity, "softness," obtained using machine learning to correlate with imminent plastic rearrangements. We show that softness also correlates with local yield strain. We incorporate softness to construct a "structuro-elasto-plasticity" model that reproduces particle simulation results quantitatively for several observable quantities, confirming that we capture the influence of the interplay of local structure, plasticity, and elasticity on material response.

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