Sub-surface Groove Patterning for Strain Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current non-destructive inspection techniques fail to effectively detect strain in structural components subjected to environmental conditions such as vibration, temperature extremes, and impacts, which can compromise the mechanical properties of composite materials without providing visually detectable indications, necessitating the need for advanced methods to assess strain and schedule maintenance or replacement.
Innovation Solution
The implementation of a structural component with a geometric pattern of grooves that diffract nonvisible electromagnetic energy, allowing for detectable variations in wavelength to indicate strain, utilizing a multi-layer construction with a patterned layer concealed from environmental damage, and an inspection system that projects EM energy and detects diffracted wavelengths to quantify strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional non-destructive inspection techniques are used, then the inspection process is simple, but they fail to detect strain in structural components subjected to environmental conditions
Solution Approach 1:
The structural component is segmented into multiple layers with distinct functions: the first outer layer contains the geometric pattern for strain sensing, the second outer layer provides protection, and the patterned layer is concealed within. This segmentation allows the inspection system to focus on detecting strain through the geometric pattern while the other layers provide structural integrity and protection, thereby improving measurement precision without excessive complexity
Solution Approach 2:
The geometric pattern of grooves acts as an intermediary element that translates invisible strain into detectable diffraction patterns of electromagnetic energy. This intermediary mechanism enables the inspection system to indirectly measure strain through optical diffraction rather than requiring direct mechanical measurement, significantly improving strain detection capability while maintaining reasonable system complexity
2Measurement precision
If the geometric pattern is exposed on the surface, then strain detection is maximized, but the pattern is vulnerable to environmental damage
Solution Approach 1:
The geometric pattern is nested within the structural component, specifically positioned between the first and second outer layers. This nesting configuration allows the pattern to remain protected from environmental damage while still enabling strain detection through electromagnetic energy diffraction. The pattern is effectively concealed within the multi-layer construction, solving the contradiction between accessibility for measurement and protection from environmental factors
Solution Approach 2:
The outer layers function as protective shells that enclose the geometric pattern. These layers are designed to be transparent or transmissive to the wavelengths of electromagnetic energy used for inspection, allowing the diffraction pattern to be detected while the shells protect the pattern from environmental damage such as moisture, oxidation, and physical degradation
3Reliability
If visually detectable indications are used, then the inspection method is simple, but they are not provided when composite materials are compromised
Solution Approach 1:
The inspection system replaces visual mechanical inspection with electromagnetic energy diffraction measurement. Instead of relying on human visual detection of surface changes, the system uses electromagnetic energy that interacts with the geometric pattern to produce diffraction patterns that reveal strain information. This substitution enables detection of internal strain and damage in composite materials that would be invisible to the human eye, significantly improving reliability while the automated measurement process manages the increased complexity
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 non-destructive assessment of strain in structural components, providing actionable data for maintenance scheduling and ensuring the structural integrity of components by detecting strain variations through EM energy diffraction patterns, allowing for timely intervention and reducing the risk of mechanical failure.
Implementation Method 1
geometric pattern of grooves within the structural components that diffract nonvisible electromagnetic (EM) energy to produce detectable variations in the wavelength of EM energy reflected or transmitted from the grooves
Data Source
Figure 1~4
Figure 5~8
Figure 7A~7G
AI summary
Systems and methods for assessing strain in structural components are disclosed. Structural components may have geometric patterns of grooves within the structural component, with the grooves in the geometric pattern each having a groove width. The method may include projecting beams of electromagnetic (EM) energy through the structural component to the geometric pattern of grooves to create diffracted beams of EM energy that are reflected from or transmitted through the geometric pattern of grooves and have diffracted wavelengths indicating changes in the groove widths due to strain caused when the structural component is exposed to environmental conditions, detecting the diffracted wavelength of the diffracted beams, and correlating the diffracted wavelengths of the diffracted beams to the strain in the structural components.