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Bending of Curved Members - Neutral Surface01:16

Bending of Curved Members - Neutral Surface

209
In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
Consider the curved member described in the previous lesson. According to Hooke's law, which relates stress to strain within...
209

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相关实验视频

Updated: Aug 6, 2025

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
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A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

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使用微网格设计编程3D曲面

Xu Cheng1,2, Zhichao Fan1,2,3, Shenglian Yao4

  • 1Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, P.R. China.

Science (New York, N.Y.)
|March 23, 2023
PubMed
概括
此摘要是机器生成的。

科学家开发了一种新的微网格设计, 用机械组装将二维电影编程成三维曲面. 这一突破使得复杂的形状可以用于医疗设备和机器人等先进的应用.

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相关实验视频

Last Updated: Aug 6, 2025

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11:42

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科学领域:

  • 材料科学
  • 机械工程
  • 生物仿真

背景情况:

  • 有机体中的自然细胞微观结构为基本功能创造了复杂的3D形状.
  • 使用细胞设计在人工系统中复制这种3D形状形成仍然是一个重大挑战.

研究的目的:

  • 开发一种用于将二维片编程为可编程的三维曲面.
  • 为了实现复杂的,生物灵感的3D结构的创建,

主要方法:

  • 采用了合理的微晶格设计方法.
  • 机械引导组装用于将二维电影转换为三维结构.
  • 分析建模和机器学习计算方法被用于形状编程.

主要成果:

  • 成功地将二维片转化为可编程的三维曲面.
  • 证明能够为特定的3D形状编程异质的2D微网格模式.
  • 呈现了大约30种不同的几何形状,包括正规和生物的半平面.

结论:

  • 开发的微晶格设计和组装方法为创建可编程的3D曲面提供了全新的途径.
  • 这种方法在符合电子,执行器和组织工程的支架上有潜在的应用.