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相关概念视频

Design Consideration01:22

Design Consideration

180
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
180
Fatigue01:21

Fatigue

172
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
172
Introduction to Structures01:30

Introduction to Structures

980
A structure is defined as a system of interconnected members designed to support or transfer forces and successfully withstand the loads acting on them. The internal forces of a structure can be determined by decomposing the structure and analyzing the free-body diagrams of the individual members or of a combination of members. This helps in understanding the structural elements' behavior and ensuring that the structure is stable and can withstand the subjected loads.
There are three main...
980
Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

2.1K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.1K
Indeterminate Structure01:18

Indeterminate Structure

495
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...
495
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

299
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
299

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相关实验视频

Updated: May 30, 2025

Data Acquisition Protocol for Determining Embedded Sensitivity Functions
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具有嵌入式预故障指示器的极端结构.

Christoffer Fyllgraf Christensen1,2, Jonas Engqvist2, Fengwen Wang1

  • 1Department of Civil and Mechanical Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark.

Proceedings of the National Academy of Sciences of the United States of America
|January 30, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了工程结构的内置预故障指标. 这些指标通过向接近关键负载的信号提供了潜在故障的早期警告,提高了结构安全性和可靠性.

关键词:
一个曲的,曲的.多层次结构是多层次的结构.在故障前的指示.结构健康监测 结构健康监测结构安全的结构安全.

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科学领域:

  • 结构工程 结构工程
  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程

背景情况:

  • 预先识别负载下潜在的结构故障是一个重大的工程挑战.
  • 现有的监测系统可能难以获得或昂贵,特别是在恶劣的环境中,如海上风力轮机.

研究的目的:

  • 为工程结构开发创新的内置预故障指标.
  • 通过早期预警系统提高结构可靠性和安全性.
  • 减少对传统,可能无法获得的传感器的依赖.

主要方法:

  • 利用拓优化来设计具有优化载荷能力的多尺度结构.
  • 工程指标可通过非关键局部曲折通过接近临界曲折负荷的可见信号条件.
  • 探索利用材料可塑性的内存过载指标.

主要成果:

  • 在不损害结构完整性的情况下提供早期预警的指标的可行性.
  • 对3D打印设计的实验测试显示,与数值模拟有很强的相关性.
  • 证实了指示器在预先确定的位置上信号减负或维护需求的潜力.

结论:

  • 开发的方法提供了一个主动的安全功能,以提高结构可靠性.
  • 这种方法对离岸结构尤其有利,减少了传感器维护需求.
  • 引入了一种新的内置早期预警故障系统,以实现更安全的结构设计.