Universal slip dynamics in metallic glasses and granular matter - linking frictional weakening with inertial effects.
Universal slip dynamics in metallic glasses and granular matter - linking frictional weakening with inertial effects.
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DOI：
10.1038/srep43376
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发表时间：
2017-03-06
影响因子：
4.6
通讯作者：
Schall P
中科院分区：
文献类型：
--
作者：
Denisov DV;Lőrincz KA;Wright WJ;Hufnagel TC;Nawano A;Gu X;Uhl JT;Dahmen KA;Schall P
缓慢应变的固体通过间歇性滑移变形，表现出与材料无关的临界尺寸分布。在这里，通过比较两种不同的系统——颗粒材料和块体金属玻璃——我们证明，不仅滑移的统计数据而且它们的动力学都非常相似，即独立于材料的微观细节。通过解析和比较块体金属玻璃和颗粒材料中雪崩的全时演化，我们揭示了普遍变形动力学的机制。我们通过实验验证了两个系统中单个雪崩动力学的预测通用标度函数，并表明滑移统计和动力学都独立于材料结构和相互作用的尺度和细节，从而解决了关于普遍性主张是否仅包括滑移统计或也包括滑移动力学的长期争论。结果表明，颗粒材料中的摩擦减弱以及块状金属玻璃中阻尼、减弱和惯性效应的相互作用对滑移动力学具有惊人相似的影响。这些结果对于在单一变形动力学理论中跨尺度和材料结构转移实验结果非常重要。
Slowly strained solids deform via intermittent slips that exhibit a material-independent critical size distribution. Here, by comparing two disparate systems - granular materials and bulk metallic glasses - we show evidence that not only the statistics of slips but also their dynamics are remarkably similar, i.e. independent of the microscopic details of the material. By resolving and comparing the full time evolution of avalanches in bulk metallic glasses and granular materials, we uncover a regime of universal deformation dynamics. We experimentally verify the predicted universal scaling functions for the dynamics of individual avalanches in both systems, and show that both the slip statistics and dynamics are independent of the scale and details of the material structure and interactions, thus settling a long-standing debate as to whether or not the claim of universality includes only the slip statistics or also the slip dynamics. The results imply that the frictional weakening in granular materials and the interplay of damping, weakening and inertial effects in bulk metallic glasses have strikingly similar effects on the slip dynamics. These results are important for transferring experimental results across scales and material structures in a single theory of deformation dynamics.