U-Shaped Transmission Element for Bonding Strength Testing
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Solution Overview
Problem
Microfluidic devices often experience leaks under excessive loads due to inadequate bonding, particularly with materials that are difficult to bond, and existing testing methods require expensive universal testing machines that are not widely available.
Innovation Solution
A U-shaped transmission element that allows for the application of tensile and shear forces using a press, enabling the testing of bonding strength without the need for universal testing machines, made from materials like metal or polymers and preferably 3D-printed, which can be used with simple press machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If universal testing machines are used to test bonding strength, then measurement precision and reliability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent introduces a transmission element as an intermediary component that connects the press machine to the specimen elements. This transmission element converts the compressive force from the press into tensile or shear forces on the bonding area, enabling accurate bonding strength testing without requiring a complex universal testing machine. The transmission element acts as a mediator that bridges the gap between simple press machines and the requirements for precise bonding strength measurement.
2Device complexity
If conventional force transmission elements are used with press machines, then device simplicity is maintained, but the ability to test bonding strength is lost
Solution Approach 1:
The transmission element changes the force application parameters by converting compressive force from the press into tensile or shear forces on the specimen elements. This parameter transformation enables the use of simple press machines while maintaining the capability to test bonding strength reliably, as the transmission element modifies the force vector and application mode to match the testing requirements.
3Measurement precision
If specimen elements are clamped in universal testing machines, then bonding strength can be measured, but the risk of breaking brittle specimens increases
Solution Approach 1:
The patent extracts the clamping function from the testing setup by using the transmission element to distribute forces evenly across the specimen elements. Instead of concentrating forces at clamping points which can cause stress concentrations and breakage, the transmission element applies forces through its legs that engage with the specimen geometry, eliminating the harmful clamping effect while maintaining measurement capability.
4Device complexity
If adhesive bonding is used to join transmission element legs, then device complexity is reduced, but bonding strength may be insufficient under excessive loads
Solution Approach 1:
The transmission element combines multiple materials and bonding methods to achieve sufficient strength. The legs are joined to the connecting element using adhesive bonding for simplicity, but the overall structure is designed as a composite system where the geometric distribution of forces and the engagement of legs with specimen elements compensate for the relatively low strength of adhesive bonds, preventing failure under excessive loads.
Data Source
AI summary
The present invention relates to transmission elements (1, 1a, 1b; 12, 12a, 12b) for testing/determining the tensile or shear strength of a bonding between two elongated shaped specimen elements by transmitting a tensile or shear force (10, 22) to a specimen element (5a, 5b; 12a, 12b).