Specimen Testing Machine With Guide Plate Folding Control
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Solution Overview
Problem
Existing methods struggle to accurately calculate maximum bending stress without restraining specimen ends during a two-point folding test, fail to form a micro radius of curvature at the center portion, and cannot control the folding direction effectively, especially when performing folding tests on flexible elements like foldable OLEDs.
Innovation Solution
A specimen testing machine with a gripper part to hold specimen ends, a specimen driving part for longitudinal movement, a guide plate unit to adjust folding direction, and a tilting part to control folding, allowing for a micro radius of curvature formation at the center portion and enabling both folding and tensile tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the opposite ends of the specimen are restrained during folding test, then the folding direction can be controlled, but the maximum bending stress cannot be accurately calculated
Solution Approach 1:
The system separates the functions of specimen holding and folding direction control into distinct components: gripper parts for holding and guide plates for direction control. This segmentation allows the specimen ends to be restrained for directional control while maintaining the ability to calculate bending stress through the relationship between applied force and geometric parameters.
Solution Approach 2:
The guide plate acts as an intermediary element that controls the folding direction without directly restraining the specimen ends. It guides the motion path and ensures proper folding orientation while allowing the specimen to maintain its natural bending behavior for accurate stress calculation.
2Productivity
If the specimen is folded until opposite ends are in contact, then the folding test is maximized, but the radius of curvature at center portion becomes large and stress concentration is insufficient
Solution Approach 1:
The guide plate creates a localized constraint at the center portion of the specimen, forcing a small radius of curvature specifically at that location. This local quality change ensures stress concentration occurs where needed for accurate service life evaluation, while the rest of the specimen can be folded efficiently.
3Device complexity
If only one-direction folding test is performed, then the test procedure is simple, but the service life evaluation is inaccurate
Solution Approach 1:
The system enables dynamic switching between different folding directions through the tilting part and guide plate mechanism. This allows the specimen to be tested in multiple directions (upward, downward, leftward, rightward) by adjusting the guide plate orientation, providing comprehensive service life evaluation while maintaining relatively simple operation through automated direction control.
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
Enables accurate calculation of maximum bending stress without restraining specimen ends, forms a micro radius of curvature, and allows objective service life evaluation by controlling the folding direction, facilitating both folding and tensile tests.
Implementation Method 1
bending stress, etc. can be calculated through a two-point folding test... applying the bending stress to the specimen... The maximum bending stress (σmax) generated on a neutral surface (neutral axis) of the specimen
Implementation Method 2
a guide plate that may be configured to be moved along with a folding direction of the specimen, and to be folded at a center portion thereof
Implementation Method 3
a specimen test unit including: a pair of gripper parts configured to respectively hold opposite ends of a specimen... a specimen driving part configured to move the specimen in a longitudinal direction of the specimen
Data Source
AI summary
The present disclosure relates to a specimen testing machine which includes: a specimen test unit comprising: a pair of gripper parts configured to respectively hold opposite ends of a specimen, a gripper fixing part configured to fix at least any one of the pair of gripper parts, and a specimen driving part configured to move the specimen in a longitudinal direction of the specimen; and a guide plate unit including: a guide plate that is configured to be moved along with a folding direction of the specimen, and to be folded at a center portion thereof, and a second driving part comprising a second fixing part configured to fix opposite ends of the guide plate, and configured to move the specimen in the longitudinal direction of the specimen.