Automated Vibrothermography Inspection for Composite Disbonding
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Solution Overview
Problem
Current nondestructive inspection methods for detecting defects in components, such as delamination or disbonding in composite materials, are tedious, time-consuming, and prone to errors due to manual review of thermoacoustic imagery, and may not be applicable to all types of components, especially those requiring external heating.
Innovation Solution
A nondestructive vibrothermography inspection method that generates ultrasonic excitations over a range of frequencies to create a thermal signature, compares this signature with a component model, and classifies the component as acceptable or defective, specifically identifying disbond areas within predetermined regions, using a system comprising a fixture, ultrasonic excitation source, thermography system, and a controller for automated classification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual review of thermoacoustic imagery is used for defect detection, then inspection can be performed, but the process becomes tedious, time-consuming, and error-prone
Solution Approach 1:
The patent replaces manual visual inspection with an automated computer-based system that processes thermoacoustic imagery. The system uses automated image processing algorithms to detect defects, eliminating the need for human reviewers to manually examine images. This substitution of mechanical/manual processes with automated computational methods resolves the contradiction by maintaining high detection accuracy while dramatically reducing inspection time and eliminating human error.
2Adaptability or versatility
If external heating methods like pulsed thermography are used for crack detection, then thermal conductivity can be measured, but the method requires external heating which may not be applicable to composite material components
Solution Approach 1:
The patent changes the excitation parameter from external thermal heating to ultrasonic vibration. Instead of applying external heat sources that may damage or be incompatible with composite materials, the system uses ultrasonic vibrations to generate thermal effects through internal friction and energy dissipation at defect locations. This parameter change enables the inspection method to be applied to composite material components while maintaining the ability to detect defects through thermal signature analysis.
Solution Approach 2:
The patent employs ultrasonic vibration as the excitation mechanism instead of external heating. The ultrasonic transducer applies mechanical vibrations to the component, which generate localized heating at defect sites through energy dissipation. This mechanical vibration approach is particularly suitable for composite materials as it non-invasively excites the material without requiring external heat application, thereby improving adaptability while simplifying the inspection process.
3Productivity
If automated statistical analysis with rapid exterior heating is used, then crack detection can be performed, but the method is not applicable to all component types especially composites
Solution Approach 1:
The patent creates a universal inspection system that can handle multiple component types including metals, composites, and ceramics. By using ultrasonic excitation instead of external heating, the system achieves multi-functionality across different material types. The ultrasonic method works for all these materials without requiring material-specific adjustments or external heating apparatus, thereby maintaining high productivity while improving adaptability to various component types.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables efficient, automated detection of defects like delamination and disbonding, reducing human error, inspection time, and cost, while being applicable to composite materials without the need for external heating, thereby improving the accuracy and efficiency of component inspection.
Implementation Method 1
generating ultrasonic excitations in a component over a range of frequencies
Implementation Method 2
thermoacoustic techniques (also known as vibroacoustic, vibrothermography, thermosonic, or sonic infrared techniques) wherein vibration of the component induces localized heating at defect locations
Implementation Method 3
The heating is detected by an infrared camera
Implementation Method 4
determine a thermal signature in the component from the excitations
Data Source
AI summary
A method for nondestructive vibrothermography inspection of a component, the method includes generating ultrasonic excitations in a component over a range of frequencies; determining a thermal signature in the component from the excitations; registering a model with the thermal signature; determining damage based on the thermal signal and model; and classifying the component based on the determining.