Connecting Local Yield Stresses with Plastic Activity in Amorphous Solids
Connecting Local Yield Stresses with Plastic Activity in Amorphous Solids
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DOI：
10.1103/physrevlett.117.045501
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发表时间：
2016-07-20
影响因子：
8.6
通讯作者：
Falk, Michael L.
中科院分区：
文献类型：
--
作者：
Patinet, Sylvain;Vandembroucq, Damien;Falk, Michael L.
通过不同的淬火协议产生的模型无定形固体中，建立了强相关性之间的局部屈服应力测量的剪切应力阈值和远程加载剪切过程中观察到的塑性重排的直接本地探测。与更传统的结构特性相比，这种纯粹的局部测量显示出更高的预测能力，用于识别塑料活动的位点。最重要的是，低局部屈服应力的网站，因此定义，被证明是持久的，即使在50或更多这样的塑性重排后，仍然预测变形事件。这种直接和非微扰的方法提供了访问相关的过渡途径，控制非晶固体的稳定性。我们的研究结果加强了相关的建模塑性在无定形固体的基础上逐渐演变的人口的离散和局部区域预先存在的结构。
In model amorphous solids produced via differing quench protocols, a strong correlation is established between local yield stress measured by direct local probing of shear stress thresholds and the plastic rearrangements observed during remote loading in shear. This purely local measure shows a higher predictive power for identifying sites of plastic activity when compared with more conventional structural properties. Most importantly, the sites of low local yield stress, thus defined, are shown to be persistent, remaining predictive of deformation events even after fifty or more such plastic rearrangements. This direct and nonperturbative approach gives access to relevant transition pathways that control the stability of amorphous solids. Our results reinforce the relevance of modeling plasticity in amorphous solids based on a gradually evolving population of discrete and local zones preexisting in the structure.