Article
Physics, Fluids & Plasmas
Harukuni Ikeda, Koji Hukushima
Summary: Critical properties of frictionless spherical particles below jamming transition point are studied through numerical simulations, showing a power-law divergence in the squared norm of nonaffine displacements. The participation ratio of the nonaffine displacements vanishes at the transition point, indicating localization with a fractal dimension. The distribution of displacements exhibits a power-law tail, with an exponent related to the fractal dimension.
Article
Physics, Multidisciplinary
Hui Wang, Wojciech Dmowski, Yang Tong, Zengquan Wang, Yoshihiko Yokoyama, Jittisa Ketkaew, Jan Schroers, Takeshi Egami
Summary: This study suggests that the plasticity of metallic glasses is related to the local atomic rearrangements under stress, rather than their atomic structure directly. By conducting experiments on various bulk metallic glasses, researchers found that the extent of local deviation from affine deformation within the elastic regime is strongly correlated with the plastic behavior of metallic glasses beyond yield.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Norihiro Oyama, Hideyuki Mizuno, Atsushi Ikeda
Summary: The study reveals the presence of different avalanche events in sheared glasses, leading to nonuniversal behavior in the avalanche size distribution, with the critical exponent tau matching the prediction of MFD theory. As shear is applied, the system gradually transitions into a critical state.
Article
Materials Science, Ceramics
Yang Liu, Huashan Liu, Hailong Peng
Summary: We use molecular dynamics simulations to mimic the structural heterogeneity of inclusions in nanoscale CuZr metallic glasses (MGs) by pinning a portion of atoms. The results indicate that the yielding behavior of MGs transitions from a system-spanning shear band to a localized plastic flow with pinning. The spatial correlation of the nonaffine displacement exhibits a quadrupolar symmetry that shrinks with pinning, which signifies the anisotropic nature of the plastic regions diminishing with pinning.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
L. Meenakshi, Bhaskar Sen Gupta
Summary: When an amorphous solid is deformed homogeneously, clusters of particles exhibit heterogeneous behavior with localized cooperative rearrangement. The distribution of these clusters and their non-affine displacements show power-law behavior in the elastic regime, followed by exponential cutoff post yielding. The non-affine displacements exhibit strong spatial correlations that become long-ranged with increasing strain. These results demonstrate the scale-free character of non-affine correlations in the steady flow regime.
Article
Mechanics
Jiahui Hao, Yu Guo
Summary: This study investigates the flow of frictional, Platonic solid-shaped particles on inclined planes using the discrete element method, and analyzes the effects of particle angular shape on rheological properties. It finds that angular particles have higher shear stresses and experience rapid surges in the coordination number and solid-phase stresses at a smaller critical solid volume fraction. Additionally, by applying a specific rolling friction to spherical particles, their rheological properties can mimic those of angular particles.
Article
Materials Science, Ceramics
Nikolai V. Priezjev
Summary: Molecular dynamics simulations were used to investigate the effect of cyclic shear deformation on structural relaxation and yielding in binary glasses. It was found that mechanical annealing occurred through intermittent plastic rearrangements, with the spatial extent decreasing as energy levels decreased. The yielding behavior was studied by adjusting strain amplitude, and it was observed that the critical strain amplitude remained constant regardless of the initial energy level. The formation of a shear band at the yielding transition was correlated with an increase in the number of atoms with large nonaffine displacements.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Multidisciplinary Sciences
Qi Zhang, Wei Li, Kaiyao Qiao, Yilong Han
Summary: The nature of liquid-to-glass transition and glass-to-liquid transition is investigated in this study, especially focusing on the surface effects. Colloidal glasses are assembled by vapor deposition and melted by adjusting particle attractions. The results show the presence of a surface liquid layer and an intermediate glassy layer, and similar melting behaviors to crystal premelting and melting. Single-particle kinetics measurements confirm theoretical predictions for the glass surface layer.
Article
Physics, Multidisciplinary
Yiming Xia, Xiunan Yang, Junchao Huang, Rui Liu, Ning Xu, Mingcheng Yang, Ke Chen
Summary: We constructed structural order parameters based on local angular and radial distribution functions in dense colloidal suspensions and found significant correlations between these parameters and local dynamics. In particular, the correlation between local orientational order and dynamical heterogeneity was consistently higher than the correlation between conventional two-body structural entropy and local dynamics. The structure-dynamics correlations can be explained by an excitation model where the energy barrier depends on local structural order. Our results suggest that in dense disordered packings, local orientational order is higher than translational order and plays a more important role in determining the dynamics in glassy systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Fluids & Plasmas
Dmytro Kushnir, Celine Ruscher, Eckhard Bartsch, Fabrice Thalmann, Pascal Hebraud
Summary: The mechanical nonlinear response of dense Brownian suspensions of polymer gel particles is investigated experimentally and through numerical simulations. The response of the suspension depends on its previous history, including flow starting from a static state and flow reversal. Numerical simulations reveal a delay between the anisotropy of the local microstructure and the macroscopic stress.
Article
Engineering, Geological
Usman Ali, Mamoru Kikumoto, Ying Cui, Matteo Ciantia, Marco Previtali
Summary: In this study, biaxial shearing tests were conducted on assemblies of dual-sized circular particles at different confining pressures. It was found that rotations occur in granular materials subjected to external loads or displacements. The rotations are more significant within the shear band and are influenced by the connectivity of particles. The rotational behavior of circular particles is not significantly affected by confining pressures.
Article
Physics, Multidisciplinary
Shiheng Cui, Huashan Liu, Hailong Peng
Summary: This study presents computer simulations on the oscillatory behavior of CuZr metallic glasses at zero temperature under different shear amplitudes. It is found that in small systems, homogeneous shear deformation occurs, while in large systems, inhomogeneous shear deformation occurs with the formation of shear bands. The spatial correlation of irreversible displacement exhibits different patterns depending on the type of deformation. The results suggest that the anisotropy and decay formula of plastic deformation in metallic glasses are controlled by the homogeneity or inhomogeneity.
Article
Physics, Multidisciplinary
Norihiro Oyama, Hideyuki Mizuno, Atsushi Ikeda
Summary: This letter reports that the instantaneous normal modes with negative eigenvalues, or so-called imaginary modes, serve as the structural signatures for the Herschel-Bulkley rheology in sheared glasses, providing new insights into the structural origins of the Herschel-Bulkley law.
PHYSICAL REVIEW LETTERS
(2021)
Article
Geochemistry & Geophysics
Yahui Zhang, Ke Gao, Changdong Li
Summary: By simulating a sheared fault containing a granular gouge, we find two regimes of fault slip driven by the heterogeneity of the gouge stress field: a dispersive regime with weak heterogeneity and a pervasive regime with strong heterogeneity. The accumulation of gouge stress field heterogeneity is an inevitable consequence of increased entropy in the preparation stage of a large earthquake, which eventually destroys the long-range stress field correlations in the gouge and resets at the beginning of a new cycle of a large earthquake.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jorge Sanchez Llorens, Lorenzo Barbera, Ahmet F. Demirors, Andre R. Studart
Summary: A light-based printing platform is reported to shape colloidal glasses into 3D objects with complex geometries and vivid structural color. The photonic properties of the printed objects reflect the locally ordered microstructure of the glass. The platform demonstrates the capability to create 3D objects with isotropic structural color.
ADVANCED MATERIALS
(2023)
