论文标题
缓慢的疲劳和高度延迟通过振荡剪切中的剪切带屈服
Slow fatigue and highly delayed yielding via shear banding in oscillatory shear
论文作者
论文摘要
从理论上讲，我们在热弹性模型和软玻璃流变模型中研究了循环剪切的无定形材料的动力学过程。在这两种模型中，我们都在剪切成立后的许多周期中发现，在整个样品中菌株异质性的损伤水平较低。然后，这种缓慢的疲劳突然让位于灾难性的屈服和物质失败。剪切带形式的强菌株定位是破坏机制的关键。我们详细介绍了在失败之前循环n*数量的依赖性对施加应变，工作温度以及样品在剪切前退火的程度的幅度的依赖性。我们参考了现有的实验和粒子模拟讨论我们的发现，并建议新的发现以测试我们的预测。
We study theoretically the dynamical process of yielding in cyclically sheared amorphous materials, within a thermal elastoplastic model and the soft glassy rheology model. Within both models we find an initially slow accumulation, over many cycles after the inception of shear, of low levels of damage in the form strain heterogeneity across the sample. This slow fatigue then suddenly gives way to catastrophic yielding and material failure. Strong strain localisation in the form of shear banding is key to the failure mechanism. We characterise in detail the dependence of the number of cycles N* before failure on the amplitude of imposed strain, the working temperature, and the degree to which the sample is annealed prior to shear. We discuss our finding with reference to existing experiments and particle simulations, and suggest new ones to test our predictions.
