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相关概念视频

Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

592
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
592
Indeterminate Structure01:18

Indeterminate Structure

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Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
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Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

246
The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
246
Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

469
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
469
Design Example: Dimensioning of Concrete Masonry Construction01:13

Design Example: Dimensioning of Concrete Masonry Construction

269
For the construction of a storeroom using concrete masonry units, it's essential to align the dimensions of the structure with the actual sizes of the blocks and the intended mortar joints. On the site in question, there's a stockpile of concrete masonry blocks with a nominal size of eight by eight by sixteen inches, which are to be used in the construction of the storeroom.
The site engineer has laid out a plan for the storeroom with external dimensions of twelve feet in length and...
269
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

544
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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4D Printed Bifurcated Stents with Kirigami-Inspired Structures
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使用有限元素方法的4D打印结构的反向设计框架.

Zaiyang Liu1, Kusuma Betha Cahaya Imani1, Mengtao Wang2

  • 1Department of Robotics, Ritsumeikan University, Shiga, 525-8577, Japan.

Scientific reports
|November 27, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了4D打印结构的反向设计框架,使得可编程,变形材料的创建成为可能. 有限元法 (FEM) 方法确定了理想的刺激响应转换的最佳打印几何.

关键词:
4D打印是一种4D打印.有限元素方法 有限元素方法.几何学非线性是指几何上的非线性.反向设计是一种反向设计.软的抓手软的抓手

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 计算设计的计算设计.

背景情况:

  • 4D打印使结构能够随着时间的推移而改变形状,以应对刺激.
  • 传统的前向模拟可以预测变形,但不能设计初始几何形状.
  • 设计复杂的,响应刺激的4D打印结构需要先进的计算工具.

研究的目的:

  • 使用有限元法 (FEM) 开发4D打印结构的反向设计框架.
  • 为了能够创建具有可编程,时间依赖的形状转换的结构.
  • 为设计具有特定功能的定制4D打印对象提供计算工具.

主要方法:

  • 开发了一个基于FEM的反向设计框架,结合了粘性弹性,几何非线性和时间依赖行为.
  • 制定了逆向设计问题作为一个优化任务.
  • 实现了一种工作流,允许用户指定目标形状和边界条件.

主要成果:

  • 通过涉及双层执行器和软抓柄的案例研究证明了框架的准确性和适应性.
  • 成功设计了使用不同刺激的可编程形状转换的4D打印结构.
  • 验证了框架能够从特定的初始几何形状预测和实现所需的最终形状的能力.

结论:

  • 拟议的基于FEM的反向设计框架是4D打印结构的通用和准确工具.
  • 该框架有助于设计复杂的,对刺激有反应的材料,具有定制的形状变化能力.
  • 这种计算方法为先进的4D打印应用程序的反向设计提供了实际解决方案.