Embedded Waveguide Test Fixture for Composite Material Stress Analysis
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Solution Overview
Problem
Conventional methods for testing composite materials struggle to provide precise and localized information about how these materials react to stresses, such as electrical discharges, due to the three-dimensional nature of electrical fields and limited post-incident inspection capabilities.
Innovation Solution
A method involving the insertion of coherent light into a waveguide embedded within the composite material, allowing the light to interact with the material and detect reactions such as heating, phase changes, or emission, using a test fixture with layers of fibrous material and a resin layer to control the stress application and observation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical probes are inserted into the composite material to drive current through the material, then the physical properties of the material can be tested, but the current flows through multiple paths making it difficult to precisely control where the current flows within the material
Solution Approach 1:
The patent divides the composite material into discrete measurement zones by embedding multiple waveguides at different locations. Each waveguide creates a separate, controllable light path through the material, allowing independent measurement of physical properties in specific regions rather than measuring the entire material at once. This segmentation enables precise control over where and how current (light) flows through the material.
Solution Approach 2:
The patent introduces waveguides as intermediary elements that carry coherent light through the composite material. These waveguides act as mediators between the light source and the material, providing a controlled pathway for light transmission. By using waveguides instead of direct electrical probes, the system achieves precise control over the measurement path while avoiding the complexity of controlling multi-path current flow.
2Loss of information
If post-incident inspection is performed on composite materials, then the material can be examined after stress incidents, but the information obtainable is limited and it is difficult to quantify the stress that the composite material experienced
Solution Approach 1:
The patent embeds waveguides within the composite material before the material is installed in its final application. This preliminary placement allows the material to be tested under controlled conditions prior to installation, enabling quantification of stress effects while the material is still accessible and measurable. The waveguides are positioned in advance to facilitate subsequent light-based measurement of physical properties and stress response.
Solution Approach 2:
The patent replaces electrical current-based measurement with optical measurement using coherent light through waveguides. This substitution allows for non-contact, non-intrusive measurement of physical properties and stress effects. The optical method provides superior capability for quantifying stress information compared to post-incident electrical inspection, as light can penetrate and interact with the material without causing additional damage or requiring complex electrical measurements.
3Measurement precision
If coherent light is inserted into a waveguide embedded within the material, then the light interacts with the material allowing detection of reactions, but the test fixture requires multiple layers of fibrous material and resin layer formation
Solution Approach 1:
The patent embeds the waveguide within the resin layer that is part of the composite material structure. The waveguide is nested within the resin layer, which itself is part of the layered fibrous material structure. This nested arrangement integrates the measurement function into the existing material structure, allowing the waveguide to be surrounded and supported by the composite material layers without requiring separate, complex fixture structures.
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 approach enables more accurate quantification of stress effects on a per-volume basis, allowing for pre-installation assessment of composite materials and determining their suitability for use in stressful environments.
Implementation Method 1
inserting coherent light into a waveguide such that the coherent light exits the waveguide at an end of the waveguide that is embedded within the material
Implementation Method 2
detecting a reaction of the material to the coherent light
Implementation Method 3
detect reactions such as heating, phase changes, or emission
Data Source
AI summary
A method for testing physical properties of a material includes inserting coherent light into a waveguide such that the coherent light exits the waveguide at an end of the waveguide that is embedded within the material, thereby causing the coherent light to interact with the material. The method also includes detecting a reaction of the material to the coherent light.