Yeh Wei-Ting, Ozawa Misaki, Miyazaki Kunimasa, Kawasaki Takeshi, Berthier Ludovic
Department of Physics, Nagoya University, 464-8602 Nagoya, Japan.
Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, 34095 Montpellier, France.
Phys Rev Lett. 2020 Jun 5;124(22):225502. doi: 10.1103/PhysRevLett.124.225502.
We perform molecular dynamics simulations to investigate the effect of a glass preparation on its yielding transition under oscillatory shear. We use swap Monte Carlo to investigate a broad range of glass stabilities from poorly annealed to highly stable systems. We observe a qualitative change in the nature of yielding, which evolves from ductile to brittle as glass stability increases. Our results disentangle the relative role of mechanical and thermal annealing on the mechanical properties of amorphous solids, which is relevant for various experimental situations from the rheology of soft materials to fatigue failure in metallic glasses.
我们进行分子动力学模拟，以研究玻璃制备对其在振荡剪切下屈服转变的影响。我们使用交换蒙特卡罗方法来研究从退火不良到高度稳定系统的广泛玻璃稳定性。我们观察到屈服性质的定性变化，随着玻璃稳定性的增加，屈服性质从韧性转变为脆性。我们的结果厘清了机械退火和热退火对非晶态固体力学性能的相对作用，这与从软材料流变学到金属玻璃疲劳失效的各种实验情况相关。
