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相关概念视频

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...

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相关实验视频

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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厄迪电流传感器探测器设计用于增材制造中的地下缺陷检测.

Heba E Farag1, Mir Behrad Khamesee1, Ehsan Toyserkani1

  • 1Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.

Sensors (Basel, Switzerland)
|August 29, 2024
PubMed
概括

这项研究引入了一个流探测器,用于检测增材制造部件中的内部缺陷,如毛孔和裂. 新的探测器设计成功识别了人工缺陷,提高了增材制造中的质量控制.

科学领域:

  • 材料科学 材料科学 材料科学
  • 非破坏性测试是指非破坏性测试.
  • 添加剂制造 添加剂制造 添加剂制造

背景情况:

  • 增材制造 (AM) 工艺,如激光粉床融合,往往导致内部缺陷,如毛孔和裂.
  • 这些缺陷损害了AM生产的零件的耐用性和可靠性.
  • 早期检测缺陷对于实时过程控制和提高产品质量至关重要.

研究的目的:

  • 提出和评估一种基于流的新型探测器,用于检测增材制造组件的地下缺陷.
  • 使用电磁有限元分析优化探头设计.
  • 评估探测器识别模仿毛孔和裂的人工缺陷的能力.

主要方法:

  • 电磁有限元分析用于探头几何优化.
  • 一个流探测器原型是根据优化设计制造的.
  • 人工缺陷 (盲孔和口) 被引入不钢板,以模拟制造缺陷.
  • 探测器的性能通过在特定深度检测不同尺寸的缺陷来评估.

主要成果:

  • 旋流探测器成功检测到人造缺陷,包括半径为0.17毫米的盲孔和0.43毫米宽和5毫米长的口.
  • 在表面0.5毫米以下的缺陷中,通过将探头放置在后面表面来实现检测.
关键词:
添加剂制造 添加剂制造 添加剂制造厄迪电流 (eddy current) 是一种流.非破坏性测试是指非破坏性测试.探测器设计 探测器设计

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  • 该方法即使在表面粗度低于2微米的样品上也表现出有效性.

    • 结论:

    • 开发的旋流探测器对在现场检测增材制造部件中的毛孔和裂有很大的前景.
    • 这项技术为增材制造工艺中的实时质量控制提供了潜在的解决方案.
    • 需要在增材制造行业进一步应用非破坏性评估.