A5003309236- Granular flow and fluidized beds
- Material Dynamics and Properties
- Landslides and related hazards
- Geotechnical and Geomechanical Engineering
- Sports Dynamics and Biomechanics
- Rock Mechanics and Modeling
- Advanced Materials and Mechanics
- Plant responses to water stress
- Plant Surface Properties and Treatments
- Rheology and Fluid Dynamics Studies
- Aeolian processes and effects
- Ecosystem dynamics and resilience
- Geology and Paleoclimatology Research
- Icing and De-icing Technologies
- Environmental Quality and Pollution
- Textile materials and evaluations
- Cellular and Composite Structures
- Industrial Vision Systems and Defect Detection
- Gait Recognition and Analysis
- Sustainability and Ecological Systems Analysis
- Elasticity and Material Modeling
- Adhesion, Friction, and Surface Interactions
- Experimental and Theoretical Physics Studies
- Seismic Waves and Analysis
- Hydrogels: synthesis, properties, applications
University of Hong Kong
2022-2024
Hong Kong University of Science and Technology
2022-2024
Chongqing Technology and Business University
2023
Duke University
2017-2022
Henan Agricultural University
2021
We study the jamming phase diagram of sheared granular material using a novel Couette shear setup with multiring bottom. The uses small basal friction forces to apply volume-conserving linear no band system composed frictional photoelastic discs. can generate arbitrarily large strain due its circular geometry, and direction be reversed, allowing us measure feature that distinguishes shear-jammed from fragile states. report systematic measurements stress, strain, contact network structure at...
Abstract Soft composite solids are made of inclusions dispersed within soft matrices. They ubiquitous in nature and form the basis many biological tissues. In field materials science, synthetic composites promising candidates for building various engineering devices due to their highly programmable features. However, when volume fraction increases, predicting mechanical properties these poses a significant challenge classical theories mechanics. The difficulty arises from inherently...
The intensity gradient method (G2 method), namely computing the light gradient-squared, is a widely used non-invasive experimental to extract stress information from quasi-two-dimensional photoelastic granular materials. Previous works show that calibrated G2 an accurate measure of global stress. However, whether it can be at particle scale aside special case diametric loading remains unclear. We test here applicability and limitations as indicator specify its dependence on relevant...
Dry granular materials such as sand, gravel, pills, or agricultural grains, can become rigid when compressed sheared. At low density, one distort the shape of a container material without encountering any resistance. Under isotropic compression, will reach certain {\it jamming} density and then resist further compression. {\em Shear occurs resistance to shear emerges in system at lower than jamming elastic properties states have important implications for industrial geophysical processes. We...
The integrity and health of the ecosystem is material basis for common prosperity different minority areas. Since acceleration social economic growth in 21st century, excessive development has caused ecological imbalance, climate change environmental pollution other problems. irrational use natural resources gradually affects balance between man nature. In this paper, characteristics four sub-systems environment, economy, society management Three Gorges Reservoir area are selected to study....
The study on the deposition efficiency of pesticide droplets soybean leaves can provide basis for reducing quantity and increasing during application plant protection machinery. movement behavior droplet impinges leaf surface is affected by many factors, among which most important easiest to adjust are spray size impingement velocity. By changing impact velocity using Fluent simulation software, hitting was simulated a test platform established verify results. conclusions as follows:...
We systematically investigated the impact of boundary confinement on shear-thickening rheology dense granular suspensions. Under highly confined conditions, suspensions were found to exhibit size-dependent or even rarely reported nonmonotonic (S-shaped) flow curves in steady states. By performing situ stress microscopy measurements, we observed enhanced heterogeneities suspensions, where concentrated high-stress domains propagated stably either along against shear direction. comparing...
The jamming behavior of a system composed discs has been well documented. However, it remains unclear how granular consisting non-spherical particles transitions between unjammed and jammed states. Here, we present compression experiments to study the transition 2D materials photoelastic heptagonal compare these results data for pentagons. We determine critical packing fraction heptagons make comparison In experiment, subject 618 cyclic compression. track motion (inlcuding rotations)...
In a recent paper (Zhao et al., Phys Rev X, 2022, 12: 031,021), we reported experimental observations of “ultrastable” states in shear-jammed granular system subjected to small-amplitude cyclic shear. such states, all the particle positions and contact forces are reproduced after each shear cycle so that strobed image stresses appears static. present work, report further analyses data from those experiments characterize both global local responses ultrastable within cycle, not just dynamics....
The strain-rate sensitivity of confined granular materials has been widely explored, with most findings exhibiting rate-strengthening behaviors. This study, however, reveals a distinct rate-softening behavior across certain strain rate range based on triaxial tests particle clusters various different surface properties, sizes, shapes, and stiffness. softening effect is especially pronounced in the case common rice particles. By examining particles under confining pressure conditions,...
We present a novel Couette shear apparatus capable of generating programmable azimuthal strain inside 2D granular matter under shear. The consists 21 independently movable concentric rings and two boundary wheels with frictional racks. This makes it possible to quasistatically the not only from boundaries but also bottom. show that, by specifying collective motion rings, successfully generates desired profile sample system, which is composed about 2000 photoelastic disks. stress each...
Soft composite solids are made of inclusions dispersed within soft matrices. They ubiquitous in nature and form the basis many biological tissues. In field materials science, synthetic composites promising candidates for building various engineering devices due to their highly programmable features. However, when volume fraction increases, predicting mechanical properties these poses a significant challenge classical theories mechanics. The difficulty arises from inherently disordered,...