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Related Concept Videos

Shearing Strain01:20

Shearing Strain

719
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
719
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

1.4K
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
1.4K
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

367
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
367
Shearing Stress01:19

Shearing Stress

987
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
987
Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

839
Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
839
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

320
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
320

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Size effect on contact behavior in DEM simple shear tests.

Yao Li1, Jiaping Li2, Tantan Zhu2

  • 1Chang'an University, Xi'an, 710064, China. yao.li@chd.edu.cn.

Scientific Reports
|October 8, 2021
PubMed
Summary
This summary is machine-generated.

Particle size in DEM simulations for geotechnical testing significantly impacts results. A specimen height to maximum particle diameter ratio below 10 is recommended for accurate macro-meso mechanical behavior in simple shear tests.

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Area of Science:

  • Geotechnical Engineering
  • Computational Mechanics
  • Particle Physics

Background:

  • Traditional DEM simulations use particle sizes 2-2.5 times the sand diameter.
  • This approach overlooks the crucial specimen height to maximum particle diameter ratio.
  • This oversight can cause stress concentration and inaccurate simulation outcomes in geotechnical testing.

Purpose of the Study:

  • To compare laboratory simple shear tests with DEM simulations using varying particle sizes.
  • To investigate the influence of the specimen height to maximum particle diameter ratio on simulation accuracy.
  • To refine DEM modeling parameters for enhanced geotechnical testing simulations.

Main Methods:

  • Conducted laboratory simple shear tests and corresponding DEM simulations.
  • Employed clump rings in DEM models to mimic physical rings and reduced wall-type ring stress.
  • Utilized different particle sizes (1D, 2D, 4D) in DEM simulations for comparative analysis.

Main Results:

  • DEM models with tested and twofold particle sizes (1D, 2D) accurately captured stress-strain behavior, volumetric changes, and noncoaxiality.
  • A 4D particle size model exhibited asymmetrical force distribution, indicating specimen inhomogeneity and stress concentration.
  • A specimen height to maximum particle diameter ratio less than 10 yielded reasonable macro-meso mechanical behaviors.

Conclusions:

  • Particle size selection and specimen geometry are critical for reliable DEM simulations in geotechnical engineering.
  • DEM models utilizing tested particle size and twofold sand particle size offer superior accuracy.
  • Further research should focus on optimizing the specimen height to maximum particle diameter ratio guidance for DEM simulations.