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相关概念视频

Shearing Strain01:20

Shearing Strain

1.3K
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 the...
1.3K
Bulk Density of Aggregate01:22

Bulk Density of Aggregate

1.1K
Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...
1.1K
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

767
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
767
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

556
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.
556
Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

669
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...
669
Generalized Hooke's Law01:22

Generalized Hooke's Law

2.6K
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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粒子尺度的异质性控制了剪切颗粒物质中的批量性质.

Carmen L Lee1, Ephraim Bililign1,2, Emilien Azéma3,4,5

  • 1North Carolina State University, Department of Physics, Raleigh, North Carolina 27695, USA.

Physical review letters
|September 22, 2025
PubMed
概括

这项研究通过实验验证了颗粒材料中的应力-强力-织物 (SFF) 关系. 粒子尺度力和织物异性量化地预测了批量摩擦和应力张力元件.

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科学领域:

  • 颗粒物理 颗粒物理
  • 软物质物理学 软物质物理学
  • 实验力学是一个实验力学.

背景情况:

  • 密集颗粒物质的动力学涉及粒子尺度和介质尺度的影响.
  • 不同类型的结构,如颗粒连接性和力传输,通过应力-力-织物 (SFF) 关系影响散体性质.
  • 这些效应的实验验证一直受到测量粒子尺度力方面的挑战的限制.

研究的目的:

  • 实验性地研究粒子尺度结构异质与剪切颗粒系统中的散体特性之间的联系.
  • 在实验室环境中验证应力-力-织物 (SFF) 关系的定量预测能力.
  • 弥合理论模型和实验测量颗粒物质行为之间的差距.

主要方法:

  • 在近二维环状细胞中的剪切光弹性颗粒系统上进行的实验.
  • 在加载过程中测量粒子位置,接触点以及正常和摩擦力向量.
  • 重建接触和力向量的角分布,以提取出现的异构形态.

主要成果:

  • 成功测量了粒子尺度力和接触向量的分布及其异构.
  • 证明应力-力-织物 (SFF) 关系在定量上预测了粒子尺度异构和应力张力元件之间的关系.
  • 展示了SFF关系捕捉短暂行为和预测散装摩擦系数的能力.

结论:

  • 应力力-织物 (SFF) 关系被实验验证为颗粒材料中散装性质的定量预测因子.
  • 粒子尺度力和织物异性直接影响宏观行为,正如SFF关系所证明的那样.
  • 这项研究缩小了理论/数值模型和颗粒物理中的实验观测之间的差距.