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Defect Detection and Imaging in Composite Structures Using Magnetostrictive Patch Transducers.

Akram Zitoun1, Steven Dixon2, Mihalis Kazilas1

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Summary

This study explores using magnetostrictive patches to detect defects in composite materials like CFRP and GFRP. The technique successfully imaged flaws using shear horizontal guided waves and the synthetic aperture focusing technique.

Keywords:
SAFT imaging techniqueguided wavesmagnetostriction

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Area of Science:

  • Materials Science
  • Non-destructive Testing
  • Ultrasonics

Background:

  • Composite materials like CFRP and GFRP are increasingly used in critical applications.
  • Effective non-destructive testing (NDT) methods are crucial for ensuring the integrity of these materials.
  • Guided waves offer a promising approach for inspecting large composite structures.

Purpose of the Study:

  • To investigate the use of magnetostrictive patches for generating and detecting guided waves in composite materials.
  • To evaluate the effectiveness of this method for defect detection and imaging in CFRP and GFRP plates.
  • To apply the synthetic aperture focusing technique (SAFT) for defect reconstruction.

Main Methods:

  • Utilized thin magnetostrictive patches as transducers for guided wave generation and detection.
  • Employed SH0 shear horizontal guided waves for inspection.
  • Implemented the synthetic aperture focusing technique (SAFT) for defect imaging.
  • Conducted experiments on both carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) plates.

Main Results:

  • Successfully generated SH0 guided waves with controlled directional properties using magnetostrictive patch transducers.
  • Demonstrated the capability of SAFT to reconstruct images of defects within both CFRP and GFRP samples.
  • Presented imaging results showcasing the detection and localization of flaws in the tested composite materials.

Conclusions:

  • Magnetostrictive patches are effective for generating and detecting guided waves in composite materials.
  • The SAFT-based approach using SH0 waves shows significant potential for non-destructive evaluation and defect imaging in CFRP and GFRP.
  • This method provides a viable technique for ensuring the structural health of composite components.