Bond Inspection System Using Reactive Material Wave Conversion
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Solution Overview
Problem
Conventional non-destructive bond inspection systems for composite materials, such as CFRP composites, require large and costly lasers that are difficult to move and power, making them unsuitable for on-site inspections in the aerospace industry.
Innovation Solution
A compact bond inspection system using a reactive material shaped in a predetermined pattern, activated by a lower-energy source like a 10 joule laser, to create compression waves that travel through the structure and reflect as tension waves for bondline inspection, reducing power requirements and system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional laser bond inspection system is used, then the bondline integrity can be tested non-destructively, but the system requires large and costly lasers that are difficult to move and power
Solution Approach 1:
The patent introduces an intermediary layer (such as a polymer film or coating) placed on the surface of the composite structure. This intermediary material converts the incident laser energy into mechanical compression waves more efficiently, allowing the use of lower-energy lasers while maintaining the ability to generate sufficient stress waves for bondline inspection. This mediator enables the system to be more portable and less power-intensive.
Solution Approach 2:
The patent changes the physical parameters of the inspection system by using materials with specific acoustic impedance properties and optimizing the laser pulse duration and intensity. By carefully selecting materials with matched acoustic impedances and adjusting laser parameters, the system achieves effective bondline inspection with reduced laser energy requirements, improving portability while maintaining reliability.
2Reliability
If a conventional laser bond inspection system is used, then the bondline integrity can be tested non-destructively, but the system is relatively costly and requires relatively large amounts of power to operate
Solution Approach 1:
The intermediary material layer acts as an energy conversion medium that transforms optical laser energy into mechanical wave energy with higher efficiency. This conversion process reduces the total laser energy required to generate the necessary compression waves for bondline inspection, thereby lowering power consumption while maintaining inspection reliability.
Solution Approach 2:
The patent utilizes phase transition phenomena in the intermediary material (such as rapid heating and ablation) to convert laser energy into mechanical stress waves. This phase transition mechanism provides an efficient energy conversion pathway that reduces the overall power requirements of the laser system while maintaining the ability to detect bondline integrity.
3Reliability
If a conventional laser bond inspection system is used, then the bondline integrity can be tested non-destructively, but the system requires relatively large lasers that are difficult to move to a job site
Solution Approach 1:
The intermediary material enables the use of compact, low-energy lasers by providing an efficient energy conversion mechanism. This mediator allows the system to achieve the same inspection capability with a much smaller and lighter laser source, making the overall system portable and suitable for field deployment at job sites.
Solution Approach 2:
The patent replaces the need for large mechanical laser systems with a combination of optical energy and material-based wave generation. By using the intermediary material to convert optical energy into mechanical waves, the system eliminates the need for heavy mechanical components, resulting in a lighter, more portable inspection device.
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
Enables efficient, cost-effective, and portable non-destructive bondline inspection in the aerospace industry by using a smaller, less power-intensive system that effectively tests bond integrity without damaging the composite structure.
Implementation Method 1
a laser that is directed at a polyvinylchloride (PVC) tape that has been adhesively attached to the surface of the composite structure at the site of the bond to be inspected. The energy from the laser ablates the tape, creating compression waves
Implementation Method 2
The energy from the laser ablates the tape, creating compression waves that travel through the composite structure to be reflected from an opposite surface of the structure as tension waves
Implementation Method 3
the resultant surface motion of the composite structure is detected by a velocity interferometer system for any reflector (VISAR), which measures velocity on the surface of the bonded structure
Data Source
AI summary
A bond inspection system may include a material that reacts to applied activation energy by creating a compression wave, the material positioned adjacent a surface of a structure having a bond to be inspected and shaped in a predetermined pattern, such that reaction of the material causes compression waves to travel through the surface and structure; a source of activation energy capable of directing the activation energy at the material; and a controller programmed to actuate the source of activation energy to direct the activation energy at discrete portions of the predetermined pattern of material in a predetermined sequence selected to create a plurality of the compression waves so that the compression waves reflect from an opposite side of the structure as a plurality of tension waves that combine at substantially the same time at a bondline of the structure to be inspected.