Related Experiment Video
Updated: Apr 13, 2026
12:49
Measurement of Aggregate Cohesion by Tissue Surface Tensiometry
Published on: April 8, 2011
13.1K
Packing of cohesive angular particles: Cohesive strength, structure, and effects of angularity
Theechalit Binaree1, Peerapong Jitsangiam1, Mathieu Renouf2
1Chiang Mai University, -Advanced Railway Civil and Foundation Engineering Center (CMU-RailCFC), Department of Civil Engineering, Faculty of Engineering, Chiang Mai University, 239 Huay Kaew Road, Muang, Chiang Mai 50200, Thailand.
Physical Review. E
|February 20, 2025
Summary
Grain angularity significantly impacts cohesive granular packing strength. Higher angularity increases both cohesion and friction angle, with friction eventually plateauing for very angular grains.
Area of Science:
- Geophysics
- Materials Science
- Computational Physics
Background:
- Understanding the mechanical behavior of granular materials is crucial in various fields, including geotechnical engineering and materials science.
- The influence of grain shape on the bulk properties of granular assemblies is a complex phenomenon that requires detailed investigation.
Purpose of the Study:
- To investigate the effect of grain shape angularity on the quasistatic shear strength of cohesive granular packings.
- To analyze the relationship between grain angularity, cohesive strength, and friction angle in granular materials.
Main Methods:
- Extensive 2D contact dynamics simulations were performed.
- Simulations considered sticky irregular polygons with varying angularity, from disklike to triangular shapes.
- An effective stresslike approach was employed to analyze the cohesive force network.
Main Results:
- Mohr-Coulomb cohesion was found to be an increasing function of grain angularity.
- The macroscopic friction angle increased with angularity and saturated for highly angular shapes.
- A micromechanical model was derived, explaining cohesion variation with angularity based on friction, contact network anisotropy, and grain shape.
Conclusions:
- Grain angularity is a key factor governing the shear strength of cohesive granular materials.
- The derived micromechanical model provides insights into the interplay of factors contributing to cohesion in granular packings.
- Findings have implications for predicting the behavior of granular materials in diverse applications.
More Related Videos
Related Concept Videos
02:56Intermolecular Forces and Physical Properties
30.2K
30.2K
01:10Angular Momentum: Single Particle
8.1K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
8.1K
01:09Angular Momentum and Principle Axes of Inertia
642
The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
642
01:25Shape and Texture of Coarse Aggregate
1.2K
Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
1.2K
01:12Bonding and Strength of Aggregate
1.0K
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
1.0K
01:30Relation Between Tensile Strength and Compressive Strength of Concrete
935
Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
935