Bending Test Apparatus for Flexible Sheet Material
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Solution Overview
Problem
Flexible electronic devices face performance degradation due to delamination and fracture under mechanical stresses, necessitating a specialized apparatus to simulate bending stress effectively during testing.
Innovation Solution
A bending test apparatus comprising a mounting table, clamping unit, and bending shaft unit with an arc-shaped sidewall, allowing for controlled bending of flexible sheet materials with low external strain and wide curvature adjustment, featuring a clamping mechanism and measurement unit for precise testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional bending test apparatus is used, then the testing structure is simple, but the external tensile force is large causing delamination and fracture
Solution Approach 1:
The bending shaft is designed with an arc-shaped sidewall that abuts against the flexible sheet material, creating a curved bending path. This curvature design distributes the bending stress evenly across the material, preventing concentration of tensile forces that would cause delamination or fracture, thereby enabling reliable bending tests with minimal external force
Solution Approach 2:
The bending shaft acts as an intermediary element between the clamping plates and the flexible sheet material. Instead of directly applying force through clamping plates alone, the bending shaft mediates the bending process by providing a controlled arc-shaped surface that the material bends around, reducing peak tensile stresses
2Adaptability or versatility
If the bending curvature is fixed, then the device structure is simple, but the adaptability to different sample sizes is poor
Solution Approach 1:
The bending shaft is designed to be movable along the Y-axis relative to the clamping plates, allowing dynamic adjustment of the bending curvature. This dynamic positioning capability enables the apparatus to adapt to different sample sizes and bending radius requirements without requiring multiple fixed curvature fixtures, maintaining structural simplicity while achieving versatility
Solution Approach 2:
The bending shaft serves multiple functions: it provides the arc-shaped bending surface, acts as a positioning reference for curvature control, and can be repositioned to accommodate different sample dimensions. This multi-functionality allows a single apparatus structure to handle various testing scenarios with different curvature requirements
3Measurement precision
If the clamping plates are fixed in position, then the device structure is simple, but the bending control precision is poor
Solution Approach 1:
The clamping plates are designed to move relative to the bending shaft along the Y-axis, enabling dynamic adjustment of the clamping position. This movement allows precise control over the bending geometry and ensures accurate reproduction of desired curvature profiles, improving measurement precision while maintaining a relatively simple mechanism through guided linear motion
Data Source
AI summary
The present invention discloses a bending test apparatus and method for a flexible sheet material. The apparatus comprises a mounting table and further comprises a clamping unit and a bending shaft unit. The clamping unit comprises a clamping part. The bending shaft unit comprises a bending shaft extending in a Z-axis direction. The bending shaft has an arc-shaped sidewall for abutting against a flexible sheet material at an end thereof away from the clamping part. The clamping part moves relative to the bending shaft in a Y-axis direction. The present invention has the following advantage: During a test, a flexible sheet material is bent with a lower external strain, has a wide adjustment curvature range, and the structure is optimized.