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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

97
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...
97

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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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在CFRP中的多角度裂纹检测基于线性激光红外热像扫描技术.

Guangyu Zhou1, Zhijie Zhang1, Wuliang Yin2

  • 1School of Instrument and Electronics, North University of China, Taiyuan 030051, China.

Polymers
|February 26, 2025
PubMed
概括

线路激光扫描红外热学有效检测碳纤维增强聚合物 (CFRP) 复合材料中的裂. 裂方向影响手工铺设的CFRP的检测,但3D打印结构显示了更好的强度.

关键词:
在CFRP的基础上.红外热像学 红外热像学 红外热像学线路激光扫描 线路激光扫描多角度裂解是多角度裂解的方法之一.

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Last Updated: May 25, 2025

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科学领域:

  • 材料科学 材料科学 材料科学
  • 非破坏性测试 不破坏性测试
  • 复合材料 复合材料 复合材料

背景情况:

  • 红外热学 (IRT) 是一种用于实时检测材料缺陷的有价值的工具.
  • 碳纤维增强聚合物 (CFRP) 容易发生各种裂,影响结构完整性.
  • 了解裂纹特性对于CFRP中准确的缺陷评估至关重要.

研究的目的:

  • 调查线路激光扫描红外热谱在不同CFRP配置中检测裂的有效性.
  • 分析裂方向和开口角度对热检测信号的影响.
  • 建立裂纹几何和热特征之间的定量关系,以改善缺陷特征.

主要方法:

  • 利用线路激光扫描红外热学来检测缺陷.
  • 检查了手工铺设的单向CFRP,3D打印的CFRP和CFRP衍射板.
  • 分析了热图像特征,包括裂中心温度和热拖尾.
  • 应用高频过用于微裂纹特征提取.

主要成果:

  • 在手工铺设的CFRP中,检测精度对与铺设方向的裂纹对齐很敏感.
  • 3D打印的CFRP结构显示对裂方向的敏感性降低.
  • 在裂开口角度,深度和热特性之间建立了强烈的相关性 (R2=0.9828,MSE=0.1287).
  • 通过使用高频过成功提取了CFRP衍射器中的微裂纹特征.

结论:

  • 线路激光扫描 (IRT) 是一种强大的CFRP裂检测方法,性能根据材料结构和裂方向而异.
  • 该研究提供了一种经过验证的定量方法,用于将热特征与裂纹几何联系起来.
  • 该方法在各种CFRP缺陷检测场景中显示出广泛的适用性和有效性.