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相关概念视频

Unsymmetric Bending01:18

Unsymmetric Bending

765
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
765
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

331
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
331
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

455
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
455
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

810
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
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Gauss's Law: Planar Symmetry01:27

Gauss's Law: Planar Symmetry

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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Symmetric Member in Bending01:07

Symmetric Member in Bending

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In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
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相关实验视频

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可重新配置的模块化原形为可调节的2D对称组.

Weiqi Liu1,2, Qun Ren3, Yunjie Wang4

  • 1School of Mechanical Engineering, Tianjin University, Tianjin 300350, China.

Science advances
|November 12, 2025
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概括

研究人员开发了灵感来自于原木的可重新配置模块,可以实现所有17个欧几里德平面空间组. 在元结构中这种可调节的对称性通过简单的空气加压实现了多种功能.

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科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程

背景情况:

  • 对称性对于电磁学和光学等领域的物理性质至关重要.
  • 目前用于改变对称性的方法通常需要重新制造或重新组装.
  • 为了在物理系统中实现多种功能,需要可调整的对称性.

研究的目的:

  • 提出一种用于重构元结构中的对称性的新方法.
  • 使用模块化组件实现所有17个欧几里德平面空间组.
  • 为了展示对称配置的简单和可逆的调机制.

主要方法:

  • 灵感来自于模块化原始创意,开发了单个自由度 (DOF) 可重新配置的模块.
  • 利用固有的动力分叉来实现丰富的对称性配置.
  • 采用了对气囊的二进制加压策略,以可逆调整对称度.

主要成果:

  • 在欧几里德平面中,只使用两组模块拼接实现了所有17个空间组.
  • 通过气囊加压来证明对称性配置的可逆调整.
  • 通过调整 metasurfaces 中的对称性组,建立了连续体中多极准束状态的选择规则.

结论:

  • 拟议的模块化方法使可调节对称性的可编程可重新配置的元结构成为可能.
  • 这项工作为设计具有动态对称性属性的多功能材料提供了一个有前途的途径.
  • 开发的系统提供了一种简单而有效的方法,用于按需对称性操纵.