Stress Luminescent Test Sheet for Accurate Strain Measurement
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Solution Overview
Problem
Existing methods for measuring stress or strain using stress luminescent materials lack responsiveness, requiring improvements in luminance intensity for accurate measurements.
Innovation Solution
A test sheet configuration with a substrate layer thicker than the stress luminescent layer, optionally including an antistatic layer and adhesive layer, enhances luminescence responsiveness by ensuring better adhesion and reduced charge buildup, allowing for more accurate stress measurement without the need for separate adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stress luminescent material is directly sprayed on the target object, then the adhesion is achieved, but the responsiveness of luminescence to stress is insufficient
Solution Approach 1:
The test sheet is divided into multiple functional layers: a substrate layer providing mechanical support and adhesion, and a stress luminescent layer containing the stress luminescent material. This segmentation allows each layer to optimize its specific function, with the substrate ensuring reliable adhesion to the target object and the stress luminescent layer providing high responsiveness luminescence output when stressed.
Solution Approach 2:
The invention uses a composite structure combining a polymeric substrate material with stress luminescent material particles dispersed in a binder. This composite approach allows the substrate to provide mechanical properties and adhesion while the stress luminescent material particles provide the luminescence response, achieving both reliable adhesion and high responsiveness.
2Reliability
If the stress luminescent material is mixed with base material for adhesion, then the adhesion ability is improved, but the luminance intensity for the same stress decreases
Solution Approach 1:
The stress luminescent material is concentrated in a dedicated stress luminescent layer with optimized composition and thickness, rather than being uniformly distributed throughout a thick base material. This local concentration of luminescent material maximizes the luminance intensity per unit stress while the substrate layer provides the necessary adhesion function.
Solution Approach 2:
The invention transitions from a single-layer sprayed coating to a multi-layer structured sheet with distinct functional zones. The substrate layer handles adhesion while the thinner stress luminescent layer handles luminescence, creating a dimensional separation of functions that resolves the trade-off between adhesion and luminance intensity.
3Reliability
If a thicker substrate layer is used, then the adhesion and structural support are improved, but the material usage increases
Solution Approach 1:
The substrate layer thickness is optimized within a specific range (10-100 μm) to provide sufficient adhesion and structural support while minimizing material consumption. This parameter optimization ensures the substrate is thick enough to maintain integrity and bonding but thin enough to reduce material usage and cost.
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 enhanced test sheet configuration significantly improves the responsiveness of stress luminescence, leading to more accurate stress measurements with increased luminance intensity and simplified adhesion processes.
Implementation Method 1
The stress luminescent material emits light in response to the stress generated therein when an external mechanical force is applied. The luminous intensity correlates with the generated stress.
Implementation Method 2
a step of irradiating one or more test sheets adhered to the target object with excitation light
Data Source
AI summary
In measuring stress or strain of a sample (1), a test sheet (90) adhered to the sample (1) is irradiated with excitation light. The test sheet (90) includes a substrate layer (92) containing a polymeric material and a stress luminescent layer (91) formed on the substrate layer (92). The stress luminescent layer (91) contains a stress luminescent material. A captured image of the test sheet (90) irradiated with the excitation light is acquired, and the luminous intensity for the test sheet is identified from the captured image.