A Gaussian Beam Based Recursive Stiffness Matrix Model to Simulate Ultrasonic Array Signals from Multi-Layered Media.

Area of Science:

• Materials Science
• Aerospace Engineering
• Non-Destructive Testing

Background:

• Ultrasonic testing using arrays and Full Matrix Capture (FMC) are crucial for inspecting aerospace composite structures.
• Anisotropy and layering in composites present challenges for FMC data interpretation.
• Existing modeling techniques are computationally expensive or do not fully account for transducer beam characteristics.

Discussion:

• This paper introduces a novel modeling technique combining the Multi-Gaussian beam model with the recursive stiffness matrix method.
• The proposed approach simulates FMC signals for layered anisotropic media, considering transducer diffraction and bounded beam effects.
• The method is validated against experimental data for both isotropic (aluminum) and layered anisotropic (CFRP) materials.

Key Insights:

• The developed model accurately simulates FMC signals for complex composite structures.
• It provides a computationally inexpensive alternative to existing methods like FDTD.
• The technique allows for understanding the influence of transducer and material parameters on FMC signal extraction.

Outlook:

• This validated, cost-effective modeling technique can enhance the reliability of ultrasonic testing in aerospace.
• Further research can explore its application to more complex material geometries and defect characterization.
• The insights gained can optimize transducer selection and inspection strategies for composite materials.