非热剪切非晶态固体中速率相关的雪崩尺寸

Plastic response and correlations in athermally sheared amorphous solids

The onset of irreversible deformation in low-temperature amorphous solids is due to the accumulation of elementary events, consisting of spacially and temporally localized atomic rearrangements involving only a few tens of atoms. Recently, numerical and experimental work addressed the issue of spatio-temporal correlations between these plastic events. Here, we provide further insight into these correlations by investigating, via molecular dynamics (MD) simulations, the plastic response of a two-dimensional amorphous solid to artificially triggered local shear transformations. We show that whil…

剪切三维非晶态固体中的雪崩尺度

Avalanche Size Scaling in Sheared Three-Dimensional Amorphous Solid

研究了模拟非晶态固体在T=0时塑性重排事件的统计特性。事件的特征在于能量释放和"滑移体积“，即塑性应变和系统体积的乘积。对于给定的系统大小$L$，它们的分布似乎是指数的，但是不能推断出特征事件大小，因为这些量的平均值随着$L^α$和$α\sim 3/2$而增加。与2D模型中得到的结果相反，我们没有看到简单连接的雪崩。该指数表明，分形形状的雪崩，这也证明了平均分形维数和参与率。

Avalanches in the athermal quasistatic limit of sheared amorphous solids: an atomistic perspective

We study the statistical properties of the yielding transition in model amorphous solids in the limit of slow, athermal deformation. Plastic flow occurs via alternating phases of elastic loading punctuated by rapid dissipative events in the form of collective avalanches. We investigate their characterization through energy vs. stress drops and at multiple stages of deformation, thus revealing a change of spatial extent of the avalanches and degree of stress correlations as deformation progresses. We show that the statistics of stress and energy drops only become comparable for large events in …

各向异性剪切颗粒介质中的雪崩

Avalanches in anisotropic sheared granular media

研究了颗粒形状各向异性对剪切颗粒介质中雪崩发生的影响。我们使用分子动力学模拟来计算两个构造板块的相对运动。%，转换边界。我们的模型认为，不规则的多边形颗粒构成的剪切带内的材料。我们发现，雪崩的大小是近似独立的颗粒形状和良好的协议与古腾堡-里希特定律，但余震序列的强烈影响的颗粒各向异性产生变化的指数表征的经验大森定律。我们的研究结果使人们能够识别各向异性粒子的存在下，在宏观力学水平上，只有通过观察雪崩序列的真正故障。此外，我们计算的雪崩的发生概率为给定值的刚度或摩擦强度，并观察到颗粒各向异性的显着影响。

用横向扩散探测剪切非晶态固体中雪崩动力学的鲁棒性

Robustness of avalanche dynamics in sheared amorphous solids as probed by transverse diffusion

使用数值模拟，我们进行了广泛的有限尺寸分析的横向扩散系数在剪切的2D非晶态固体，在很宽的应变率范围内，在温度高达过冷液体制度。因此，我们获得直接的定性证据的持久性之间的相关性基本塑料事件的玻璃化转变温度$T_g$附近。数据的定量分析，结合先前的研究$T$ -和$\dotγ$ -依赖的宏观应力\cite{ChattorajCaroliLemaitre2010}，导致我们得出结论，平均雪崩大小基本上不受温度高达$T\sim0.75 T_g$。

The effect of inertia on sheared disordered solids: Critical scaling of avalanches in two and three dimensions

Molecular dynamics simulations with varying damping are used to examine the effects of inertia and spatial dimension on sheared disordered solids in the athermal, quasistatic limit. In all cases the distribution of avalanche sizes follows a power law over at least three orders of magnitude in dissipated energy or stress drop. Scaling exponents are determined using finite-size scaling for systems with thousands to millions of particles. Three distinct universality classes are identified corresponding to overdamped and underdamped limits, as well as a crossover damping that separates the two reg…