Universal features of amorphous plasticity.
Universal features of amorphous plasticity.
复制标题
非晶塑性的普遍特征。
DOI：
10.1038/ncomms15928
复制
发表时间：
2017-07-03
影响因子：
16.6
通讯作者：
Zapperi S
中科院分区：
文献类型：
--
作者：
Budrikis Z;Castellanos DF;Sandfeld S;Zaiser M;Zapperi S
非晶固体的塑性屈服是由幂律分布变形雪崩引起的，其普遍性仍有争议。实验和分子动力学模拟受到有限的统计样本的阻碍，尽管现有的随机模型给出了精确的指数，但它们需要对固定变形方向进行强有力的假设，这与非晶态材料的统计各向同性不一致。在这里，我们介绍了非晶塑性的全张量随机中尺度模型，该模型将塑性屈服的统计物理与工程力学联系起来。它捕获了观察到的各种变形模式的复杂剪切模式，以及塑性流动的雪崩动力学。雪崩可以用通用尺寸指数和尺度函数、雪崩形状和局部稳定性分布来描述，而不受系统维数、边界和载荷条件以及应力状态的影响。我们的预测始终不同于那些平均场剥落模型，提供证据表明，塑性屈服是一种独特类型的临界现象。非晶材料塑性屈服的普遍性仍有争议。在这里，作者提出了一个张量中尺度模型，捕捉复杂的剪切模式和雪崩缩放行为，它不同于平均场模型，并提出了一种独特类型的临界现象。
Plastic yielding of amorphous solids occurs by power-law distributed deformation avalanches whose universality is still debated. Experiments and molecular dynamics simulations are hampered by limited statistical samples, and although existing stochastic models give precise exponents, they require strong assumptions about fixed deformation directions, at odds with the statistical isotropy of amorphous materials. Here, we introduce a fully tensorial, stochastic mesoscale model for amorphous plasticity that links the statistical physics of plastic yielding to engineering mechanics. It captures the complex shear patterning observed for a wide variety of deformation modes, as well as the avalanche dynamics of plastic flow. Avalanches are described by universal size exponents and scaling functions, avalanche shapes, and local stability distributions, independent of system dimensionality, boundary and loading conditions, and stress state. Our predictions consistently differ from those of mean-field depinning models, providing evidence that plastic yielding is a distinct type of critical phenomenon. The universality class for plastic yield in amorphous materials remains controversial. Here authors present a tensorial mesoscale model that captures both complex shear patterns and avalanche scaling behaviour, which differs from mean-field models and suggests a distinct type of critical phenomenon.
登录
查看更多内容
DOI：
10.1088/0965-0393/2/2/001
发表时间：
1994-03-01
影响因子：
1.8
作者：
BULATOV, VV;ARGON, AS
通讯作者：
ARGON, AS
影响因子：
3.7
作者：
Le Doussal, P;Wiese, KJ;Chauve, P
通讯作者：
Chauve, P
影响因子：
16.6
作者：
Laurson, Lasse;Illa, Xavier;Santucci, Stephane;Tallakstad, Ken Tore;Maloy, Knut Jorgen;Alava, Mikko J.
通讯作者：
Alava, Mikko J.
影响因子：
8.6
作者：
Bonamy, D.;Santucci, S.;Ponson, L.
通讯作者：
Ponson, L.
影响因子：
2.4
作者：
Laurson, Lasse;Santucci, Stephane;Zapperi, Stefano
通讯作者：
Zapperi, Stefano