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相关概念视频

Elastic Collisions: Introduction01:00

Elastic Collisions: Introduction

An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
Elasticity01:12

Elasticity

Elasticity is the ability of an object to withstand the effects of distortion and to return to its original size and shape once the forces causing deformation are removed. When an elastic material deforms under the action of an external force, it experiences internal resistance to the deformation. However, if no external force is applied, it returns to its original state.
The elasticity of an object can be described by a stress-strain curve, which represents the relationship between stress...
Bulk Modulus01:21

Bulk Modulus

The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a change in pressure to the resulting relative volume change.
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

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.
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...

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相关实验视频

Updated: May 12, 2026

Isolation of Precursor B-cell Subsets from Umbilical Cord Blood
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微观弹性来自MD. 我. 我. 我. 我. 我. 我. 我. 大量固体和流体系统.

Andrew L Lewis1, Benjamin Himberg2, Alejandro Torres-Sánchez3

  • 1Department of Physics, The University of Vermont, Burlington, Vermont 05405, USA.

The Journal of chemical physics
|January 13, 2026
PubMed
概括
此摘要是机器生成的。

应力应力波动 (SSF) 方法从单个模拟中准确估计材料弹性特性. 这种计算建模技术对各种系统有效,包括流体和生物材料.

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科学领域:

  • 计算材料科学 计算材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 化学物理 化学物理

背景情况:

  • 计算建模,包括分子动力学和蒙特卡洛模拟,通过应力-应变关系估计材料弹性特性.
  • 应力应力波动 (SSF) 方法从没有变形的平衡模拟中计算弹性特性.
  • 之前的SSF应用仅限于晶体固体和玻璃,在流体和生物材料中探索较少.

研究的目的:

  • 为了证明SSF方法对简单的范德瓦尔斯材料和分子材料的有效性.
  • 将SSF的应用扩展到流体系统和生物材料.
  • 通过将结果与已确定的技术和实验数据进行比较来验证SSF方法.

主要方法:

  • 利用应力应力波动 (SSF) 方法进行弹性性质估计.
  • 在固体,液体和气体阶段对进行平衡模拟.
  • 模拟的分子流体使用粗粒度的MARTINI力场,结合多体相互作用.
  • 针对截断的潜能进行冲动校正.

主要成果:

  • SSF方法准确地预测了不同阶段的的弹性系数和模块,匹配显式变形和体积波动方法.
  • 对固体的计算弹性系数和散装模量与先前的计算研究和实验数据有很好的一致性.
  • SSF方法准确地捕获了分子流体的弹性特性,包括具有多体相互作用的分子流体.
  • 确定了必要的冲动校正,用于准确的流体模拟和消失剪切模块.

结论:

  • SSF方法广泛适用于各种材料系统,包括简单的范德瓦尔斯材料和分子材料.
  • SSF方法提供了一种强大而有效的方法,用于从单个平衡模拟中计算完整的弹性张量.
  • 这项工作为利用SSF方法来描述复杂分子系统和生物材料的弹性特性奠定了基础.