Defect Detection and Imaging in Composite Structures Using Magnetostrictive Patch Transducers

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.