Fiber Optic Composite Joint Inspection for Strain Detection
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Solution Overview
Problem
Conventional non-destructive inspection methods, such as ultrasonic waves and X-ray CT, are inefficient and costly for inspecting composite joints with complex geometries like noodles due to signal attenuation and probe incompatibility, leading to inconsistent results.
Innovation Solution
A composite joint inspection system using a fiber optic cable embedded within the composite filler, which sends and receives light waves to measure the reflectivity index of the light, which is used to determine whether strain has impacted the composite joint based on the reflectivity index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-destructive inspection methods (ultrasonic waves, X-ray CT) are used to inspect composite joints with complex geometries like noodles, then inspection capability is provided, but the inspection becomes costly, time consuming, and produces inconsistent results due to signal attenuation and probe incompatibility
Solution Approach 1:
The patent replaces conventional mechanical inspection methods (ultrasonic waves, X-ray CT) with an optical measurement system. A light source emits light through the composite filler material, and a detector measures the transmitted light intensity. This optical method avoids the signal attenuation and probe incompatibility issues of mechanical/acoustic methods, providing consistent inspection results for complex geometries like noodles while reducing system complexity and cost.
2Difficulty of detecting and measuring
If conventional inspection methods are used for curved composite laminate structures and noodles, then inspection is attempted, but the complex geometry and location make the inspection difficult and inconsistent
Solution Approach 1:
The patent introduces light as an intermediary measurement medium that can penetrate the composite filler material without being significantly affected by its complex geometry. The light source and detector are positioned to illuminate the noodle area, and the transmitted light intensity serves as an indirect but consistent indicator of the filler's integrity, avoiding the direct measurement difficulties of conventional methods.
3Reliability
If fiber optic cable is embedded within the composite filler, then strain detection capability is provided, but the fiber optic cable must be integrated during manufacturing
Solution Approach 1:
The fiber optic cable is embedded within the composite filler during the manufacturing process, before the component is assembled and put into service. This preliminary integration ensures proper positioning and secure embedding of the sensing element, enabling accurate strain detection while avoiding the need for complex post-manufacturing installation procedures.
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
The system effectively detects and measures strain in the composite joint by using a fiber optic cable to contact the reflectivity index of the light.
Implementation Method 1
A light wave is sent through a fiber optic cable running through a cavity of the composite joint
Implementation Method 2
A reflectivity index of the light received from the fiber optic cable is measured
Data Source
AI summary
A composite joint inspection system and methods of use and forming are presented. A composite joint inspection system comprises a cavity formed by at least two composite components; a composite filler within the cavity; and a fiber optic cable running through the cavity extending out from at least one of a first end of the cavity or a second end of the cavity. The fiber optic cable is in contact with the composite filler.