Large Cylinder Drum Peel Testing Device
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Solution Overview
Problem
Existing peel testing devices struggle to provide reproducible and repeatable force measurements for fan blade reinforcements with variable thickness, as the high stiffness of these reinforcements dominates the measured force, making it difficult to accurately assess the resistance to failure of the glued interface.
Innovation Solution
A peel testing device with a pulley system formed by a fastening cable connected to a traction machine and a face roller with a larger diameter than the guide roller, which constrains the reinforcement to deform by coiling around a cylinder with a radius equal to or greater than the reinforcement's curvature, reducing the influence of reinforcement deformation on the measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional peel testing device with small diameter rollers is used, then the device is simple and economical, but the high stiffness of thick reinforcement (exceeding 1.0 mm) causes excessive deformation force that dominates the measurement and reduces reliability
Solution Approach 1:
The patent changes the critical parameter of roller diameter from small (conventional) to large (at least 100 mm). This parameter change reduces the curvature of the roller surface, allowing thick reinforcement to conform to the roller shape with minimal deformation force, thereby improving measurement reliability without excessive complexity
Solution Approach 2:
The patent introduces a pulley system with a fastening cable as an intermediary mechanism between the reinforcement and the measurement system. This intermediary allows the reinforcement to be pulled over the large diameter roller while the cable runs parallel to the roller axis, reducing direct bending moments and deformation forces on the reinforcement
2Measurement precision
If the reinforcement has high stiffness (thickness exceeding 1.0 mm), then the structural integrity is maintained, but the force necessary for bending it strongly increases and varies considerably during testing, reducing measurement precision
Solution Approach 1:
The patent changes the roller diameter parameter to at least 100 mm, which significantly reduces the bending curvature required for the reinforcement. This parameter change reduces the deformation force from dominating the measurement to being less than or equal to half the measured force, improving measurement precision
Solution Approach 2:
The patent uses a large diameter cylindrical roller (at least 100 mm) to provide a gentle curvature that the reinforcement can follow. This large curvature radius reduces the bending stress and deformation force required, making the measurement more representative of adhesive strength rather than reinforcement stiffness
3Reliability
If the reinforcement is constrained to deform by coiling around a cylinder with radius equal to or greater than the reinforcement's curvature, then the deformation force is reduced to less than or equal to half the measured force, but the device complexity increases due to the larger roller and pulley system
Solution Approach 1:
The patent specifies a minimum roller diameter of 100 mm as a critical parameter change that achieves the desired effect. This standardized parameter provides a practical balance between reducing deformation force (improving reliability) and maintaining reasonable device dimensions and 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 configuration ensures that the force necessary for deformation of the reinforcement is less than or equal to half the measured force, improving the reproducibility and repeatability of the test results and accurately characterizing the resistance to failure of the glued interface.
Implementation Method 1
a fastening cable connected, on the one hand, to the traction machine, and on the other to the face roller with which it forms a pulley system
Data Source
AI summary
A peel testing device designed to test the resistance to peeling of test pieces each formed from a support and from a reinforcement glued to this support, and comprising a frame with a face roller and at least one guide roller, a traction machine configured to peel the reinforcement from the surface of the support in a peeling direction tangential to the face roller and a sensor for measuring the force exerted by the traction machine during peeling, the device also comprising a fastening cable connected, on the one hand, to the traction machine and on the other hand to the face roller with which it forms a pulley system and the face roller which has a greater diameter than that of the guide roller comprises a mounting element for holding the reinforcement fixedly there.