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arXiv 0911.4646cond-mat.stat-mechcond-mat.mtrl-sci
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非晶态固体弹塑性理论中的时间尺度

Time Scales in the Theory of Elasto-Plasticity of Amorphous Solids

Laurent Boue, Peter Harrowell, Smarajit Karmakar, Edan Lerner, Itamar Procaccia, Ido Regev, Jacques Zylberg

摘要:

发展非晶态固体的宏观弹塑性理论需要(i)识别相关的宏观状态变量和(ii)区分表征这些变量的不同时间尺度。在目前的理论中,假设应力在与构型变量(无论是构型能量、构型熵还是有效温度)相同的时间尺度上达到其弹塑性稳态值。通过研究二维和三维的数值模拟,我们表明,这通常不是这种情况下,配置自由度可以达到弹塑性稳定状态的时间尺度上,可以是非常不同的时间尺度的应力。我们提供了一个物理讨论来合理化这些发现。

英文摘要:

Developing a macroscopic theory of elasto-plasticity in amorphous solids calls for (i) identifying the relevant macro state-variables and (ii) discriminating the different time-scales which characterize these variables. In current theories it is assumed that the stress reaches its elasto-plastic steady state value on the same time-scale as the configurational variables (be they the configurational energy, configurational entropy or the effective temperature). By examining numerical simulations in two and three dimensions we show that this is generally not the case, the configurational degrees of freedom may reach the elasto-plastic steady state on the time scales which can be very different from the time scale of the stress. We provide a physical discussion to rationalize these findings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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