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arXiv 1803.06110cond-mat.soft
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非晶材料的塑性流动和局部化:流动性的实验解释

Plastic flow and localization in an amorphous material: experimental interpretation of the fluidity

David Houdoux, Thai Binh Nguyen, Axelle Amon, Jérôme Crassous, Thai Nguyen

摘要:

我们提出了一个全面的研究塑性响应的粒状材料逐步加载。实验研究了塑性场从均匀场到非均匀场的演化及其随应变增量的涨落。我们表明,塑性场可以分解为在两个解耦的应变增量尺度上演化的两个分量。我们认为,该领域的缓慢变化的一部分,可以确定为最近推出的所谓的流动性场来解释非晶材料的流变行为。该流动性场沿着对应于莫尔-库仑角的宏观方向逐渐集中。

英文摘要:

We present a thorough study of the plastic response of a granular material progressively loaded. We study experimentally the evolution of the plastic field from a homogeneous one to an heterogeneous one and its fluctuations in term of incremental strain. We show that the plastic field can be decomposed in two components evolving on two decoupled strain increment scales. We argue that the slowly varying part of the field can be identified to the so-called fluidity field introduced recently to interpret the rheological behaviour of amorphous materials. This fluidity field progressively concentrates along a macroscopic direction corresponding to the Mohr-Coulomb angle.

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