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Rapidly Varying Flow01:24

Rapidly Varying Flow

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Related Experiment Video

Updated: May 1, 2026

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Eddy Current-Based Delamination Imaging in CFRP Using Erosion and Thresholding Approaches.

Dario J Pasadas1, Mohsen Barzegar1, Artur L Ribeiro1

  • 1Instituto de Telecomunicações, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal.

Sensors (Basel, Switzerland)
|September 28, 2024
PubMed
Summary
This summary is machine-generated.

Eddy current testing (ECT) with advanced signal and image processing effectively characterizes delamination in carbon fiber reinforced plastic (CFRP) plates. This method accurately identifies defect sizes, crucial for ensuring structural integrity of CFRP components.

Keywords:
CFRPdamage imagingdelaminationeddy current testingnon-destructive evaluation

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Area of Science:

  • Materials Science
  • Non-destructive Testing
  • Composite Materials

Background:

  • Carbon Fiber Reinforced Plastic (CFRP) is vital for structural applications due to its superior mechanical properties.
  • Damage, including delamination, can compromise CFRP integrity, necessitating robust evaluation methods.
  • Nondestructive evaluation (NDE) techniques are essential for assessing the health of CFRP structures.

Purpose of the Study:

  • To develop and evaluate signal and image processing methods for delamination characterization in thin CFRP plates using Eddy Current Testing (ECT).
  • To investigate the efficacy of peak amplitude and phase shift as damage-sensitive features in ECT.
  • To quantitatively assess the performance of damage imaging algorithms, including thresholding and erosion methods, for defect sizing.

Main Methods:

  • Utilized an inductive ECT probe with three coil elements for eddy current induction in two configurations.
  • Measured peak amplitude of induced voltage and phase shift between excitation and receiver signals.
  • Performed C-scans and applied image processing techniques, including erosion and various thresholding approaches, for damage imaging.
  • Conducted histogram analysis to compare results before and after thresholding for quantitative evaluation.

Main Results:

  • ECT successfully generated C-scans revealing delamination defects in CFRP plates.
  • Signal features (peak amplitude, phase shift) effectively indicated the presence of delamination.
  • Image processing, particularly erosion and thresholding, improved the accuracy of defect dimension extraction.
  • Quantitative analysis demonstrated the capability to evaluate damage for different delamination sizes.

Conclusions:

  • Signal and image processing methods applied to ECT data provide effective delamination characterization in CFRP.
  • The developed damage imaging approach enables quantitative assessment of defect size and shape.
  • This technique is valuable for ensuring the structural integrity and safety of CFRP components in critical applications.