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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

122
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...
122
Echo01:06

Echo

512
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
512

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相关实验视频

Updated: Jul 6, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
00:05

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

8.3K

使用脉冲回声雷利波的表面破裂裂大小测量方法.

Bhupesh Verma1, Pierre Bélanger1

  • 1PULETS, Département de Génie Mécanique, École de technologie supérieure (ÉTS), 1100 Notre-Dame St. West, Montreal, Quebec, H3C 1K3, Canada.

Ultrasonics
|January 6, 2024
PubMed
概括
此摘要是机器生成的。

一种新的无形雷利波方法使用阶段式阵列超声波测试准确大小表面裂. 这种技术提高了信号清晰度,减少了误差,为工业裂特征提供了灵活,可适应的解决方案.

关键词:
脉冲回声是一个脉冲回声.雷利的波浪是雷利的波浪.尺寸测量方法 尺寸测量方法突破表面的口突破了表面.超声波相位阵列的超声波相位阵列.

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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相关实验视频

Last Updated: Jul 6, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

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8.3K
Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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科学领域:

  • 非破坏性测试是指非破坏性测试.
  • 超声波测试 超声波测试 超声波测试
  • 材料科学是一种材料科学.

背景情况:

  • 表面裂在工业检查中带来了重大挑战.
  • 传统的旋流测试 (ECT) 和基于的雷利波方法具有局限性,包括复杂的校准,噪声和信号减弱.
  • 精确的裂深度尺寸对于结构完整性和安全性至关重要.

研究的目的:

  • 为介绍一种新的无形脉冲回声雷利波方法,用于测量表面裂大小.
  • 克服现有方法的局限性,特别是信号减弱和噪声.
  • 为了使用常规阶段阵列传感器使用飞行时间 (ToF) 信息进行准确的裂深度测量.

主要方法:

  • 开发一种采用常规相位阵列传感器的无脉冲回声雷利波技术.
  • 删除连接层,以减少信号衰减和捕捉裂纹尖端特征.
  • 应用信号平均化技术,以最大限度地减少来自其他波形的干扰,并增强信号噪声比 (SNR).
  • 通过有限元模拟和对电放电加工 (EDM) 口的实验测试进行验证.

主要成果:

  • 拟议的方法准确地测量表面裂的大小,在实验验证中达到5%以内的误差.
  • 消除形显著减少信号衰减,允许更清晰地检测裂纹尖端特征.
  • 平均化技术通过减少噪声和增强SNR,有效地减少尺寸误差.
  • 证明了EDM口的精确尺寸,模仿各种深度和角度的表面破裂裂.

结论:

  • 无形脉冲回声雷利波方法为表面裂大小提供了灵活和可适应的解决方案.
  • 该技术提高了适应工业应用的适应性,因为它与传统相位阵列传感器和宽频范围的兼容性.
  • 这种方法比现有的非破坏性裂表征技术有了显著的改进.