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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

409
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
409
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

458
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
458

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相关实验视频

Updated: Jan 9, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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在金属结构中使用平面断天线检测裂.

Nandana Radhakrishnan1, Massimo Donelli2, Sreedevi K Menon3,4

  • 1Department of Physics, Amrita Vishwa Vidyapeetham, Amritapuri 690525, India.

Sensors (Basel, Switzerland)
|December 11, 2025
PubMed
概括

一个新的单极天线有效地检测金属结构的裂,用于结构健康监测 (SHM). 它的共振频率变化准确地表明了裂的存在和传播,并通过模拟和实验验证.

关键词:
可持续发展目标11 SDG11结构健康监测 (SHM) 是一种结构健康监测.可持续发展目标9 (SDG9) 是可持续发展的第九个目标.天线传感器天线传感器裂纹检测 裂纹检测 裂纹检测一个断天线天线.

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相关实验视频

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科学领域:

  • 电气工程 电气工程
  • 材料科学 材料科学 材料科学
  • 结构健康监测 结构健康监测

背景情况:

  • 结构健康监测 (SHM) 对于保持金属结构的完整性至关重要.
  • 早期发现裂对于防止灾难性故障至关重要.
  • 基于天线的传感器提供了一个有希望的非破坏性评估方法.

研究的目的:

  • 开发和验证用于检测金属结构裂的断天线传感器.
  • 为了调查天线的灵敏度和性能下降由于裂.
  • 评估使用这种天线用于SHM应用的可行性.

主要方法:

  • 使用有限元分析 (FEA) 进行数值评估.
  • 对天线传感器性能进行实验验证.
  • 在天线的地面平面上引入裂作为干扰.

主要成果:

  • 线性共振频率的变化与裂的存在和传播有关.
  • 实现了-41.2 MHz/mm的高灵敏度,用于裂检测.
  • 分析了裂方向和尺寸对传感器性能的影响.

结论:

  • 拟议的单极天线传感器可靠地检测金属结构中的微小结构缺陷.
  • FEA和实验结果证实了天线对SHM的有效性.
  • 天线传感器显示了实时结构完整性评估的潜力.