Surface-Colored Glass Cloth for Strain Measurement
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Solution Overview
Problem
Measuring strain distribution in fiber-reinforced resin molded products with glass cloth reinforcement is challenging due to the electrical insulation properties of glass fibers, making it difficult to acquire a clear two-dimensional lattice image for accurate strain measurement.
Innovation Solution
A surface-colored glass cloth with a specific pattern of colored portions and points is used, where the colored points are arranged at regular intervals to form rows along a predetermined direction, allowing for accurate strain distribution measurement through image analysis by satisfying certain formulas related to the distance and weaving density of the glass filaments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass cloth is used as reinforced fiber in fiber-reinforced resin molded product, then electrical insulation property is improved, but measurement precision of strain distribution deteriorates due to inability to acquire clear two-dimensional lattice image
Solution Approach 1:
The patent applies color changes principle by attaching colored portions (colored points) to the glass cloth surface. These colored portions create a visible two-dimensional lattice pattern that can be captured by imaging devices, enabling strain distribution measurement while maintaining the electrical insulation properties of the glass cloth. The colored portions do not interfere with the electrical insulation function but provide optical contrast for measurement.
Solution Approach 2:
The patent uses colored portions as an intermediary element between the glass cloth and the measurement system. The colored portions serve as a mediator that translates the mechanical deformation of the glass cloth into visible optical patterns that can be analyzed by imaging devices, thereby enabling strain measurement without compromising the glass cloth's electrical insulation properties.
2Measurement precision
If colored portions are attached to glass cloth surface for image analysis, then measurement precision is improved, but device complexity increases due to additional components and arrangement requirements
Solution Approach 1:
The patent applies segmentation principle by dividing the measurement function into discrete colored portions (colored points) arranged in a systematic pattern. Each colored point serves as an independent measurement reference, and the overall strain distribution is obtained by analyzing the deformation pattern of these segmented elements. This segmentation approach enables precise measurement while maintaining a relatively simple structure.
Solution Approach 2:
The patent utilizes parameter changes by varying the arrangement parameters of the colored portions (distance D, number of rows St and Sy, widening degrees Et and Ey) to optimize measurement precision. By carefully controlling these parameters within specific ranges, the patent achieves high measurement accuracy while avoiding excessive structural complexity. The parameters are optimized to satisfy the formula: 3.3≤100×D1/2×(Et×Ey)/(St×Sy)≤25.0
Data Source
AI summary
A surface-colored glass cloth including a glass cloth which includes a warp and a weft and a plurality of colored portions which are attached to a surface of the glass cloth is disclosed. One colored portion is disposed in each area including one colored point. An average distance D between the adjacent colored points is 0.50 to 10.00 mm. When the number of warp rows is St, a warp widening degree is Et, the number of weft rows is Sy, and a weft widening degree is Ey in the glass cloth, D, St, Et, Sy, and Ey satisfy a formula: 3.3≤100×D1/2×(Et×Ey)/(St×Sy)≤25.0.