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Predicting plastic events and quantifying the local yield surface in 3D model glasses
Journal of the Mechanics and Physics of Solids ( IF 5.3 ) Pub Date : 2021-10-14 , DOI: 10.1016/j.jmps.2021.104671
Dihui Ruan 1 , Sylvain Patinet 2 , Michael L. Falk 1, 3, 4
Affiliation  

By applying the local yield stress (LYS) method to probe local regions of three-dimensional computational glass models, we confirm high correlations between the measured local yield stress (Δτc) and the plastic events when the parameterization of the method is properly optimized. The optimal probing region for this system is found to be 5σ in radius, where σ represents the Lennard-Jones length scale, approximately the atomic size. The averaged correlation remains positive through the first 200 identified plastic events or 1/3 of the yielding strain (7%). Here we apply only the local probing that aligns perfectly with the loading on the boundary. The LYS measurements converge to a Weibull distribution with a minimum Δτc indistinguishable from zero at larger probing region radii. Analysis of the data in light of an assumption that Δτc is a local quantity that obeys extreme value statistics above a critical length scale bounds the exponent of the underlying partial distribution of Δτc0.71. A thorough investigation of the anisotropy of the local yield surface at the location of the first plastic event indicates that the first triggered region does not align perfectly with the loading on the boundary, but is well-predicted by projecting the shear applied at the boundary onto the local yield surface. This implies that the correlation between the local yield stress prediction and the resulting plasticity may be enhanced by performing a more complete assessment of the local yield surface at each sample point.



中文翻译:

预测塑料事件并量化 3D 模型眼镜中的局部屈服面

通过应用局部屈服应力 (LYS) 方法来探测三维计算玻璃模型的局部区域,我们确认了测量的局部屈服应力 (ΔτC) 和方法参数化适当优化时的塑性事件。发现该系统的最佳探测区域为5σ 在半径,其中 σ代表 Lennard-Jones 长度尺度,近似于原子大小。通过前 200 个确定的塑性事件或 1/3 的屈服应变,平均相关性保持正相关(7%)。在这里,我们仅应用与边界上的负载完全一致的局部探测。LYS 测量收敛到具有最小值的威布尔分布ΔτC在较大的探测区域半径处与零无法区分。根据假设分析数据ΔτC 是一个局部量,它服从临界长度尺度以上的极值统计,它是基础部分分布的指数 ΔτC0.71. 对第一次塑性事件位置处局部屈服面的各向异性的彻底调查表明,第一次触发区域与边界上的载荷不完全对齐,但通过将施加在边界上的剪切投影到局部屈服面。这意味着通过对每个样本点的局部屈服面进行更完整的评估,可以增强局部屈服应力预测与产生的塑性之间的相关性。

更新日期:2021-10-28
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