Polymeric Connector for Dissimilar Metal Bonding
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Solution Overview
Problem
Existing joint structures fail to effectively connect dissimilar metals like aluminum and steel without direct contact, leading to corrosion issues, and struggle to deliver adhesive materials into small clearance spaces.
Innovation Solution
A connector system using a thermally expandable structural adhesive material and a shaped polymeric carrier that forms a cage-like structure to separate and bond dissimilar metals, ensuring minimal contact and filling small gaps upon activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dissimilar metals (aluminum and steel) are directly contacted to create bimetallic constructions, then weight reduction and strength are improved, but corrosion resistance deteriorates
Solution Approach 1:
A polymeric connector acts as an intermediary material between dissimilar metals (aluminum and steel), preventing direct contact and galvanic corrosion while maintaining structural strength. The connector includes a cage-like structure that physically separates the metals and an expandable adhesive material that bonds them together through the connector, ensuring no direct metal-to-metal contact occurs.
2Reliability
If a cage-like connector structure is used to prevent direct contact between dissimilar metals, then corrosion resistance is improved, but the ability to deliver adhesive material into small clearance spaces deteriorates
Solution Approach 1:
The adhesive material undergoes a parameter change through thermal expansion. The expandable adhesive is applied in a compressed state within the cage-like connector, allowing it to fit through small clearance spaces. Upon heating during the curing process, the adhesive expands to fill the entire gap between the dissimilar metals, ensuring complete bonding coverage despite the restricted initial access space.
3Weight of moving object
If lightweight materials like aluminum are used to reduce vehicle weight, then fuel economy is improved, but strength and corrosion resistance deteriorate
Solution Approach 1:
The bonding assembly creates a composite structure combining lightweight aluminum components with steel components, connected through a polymeric connector. This composite construction maintains the weight advantages of aluminum while incorporating steel's superior strength where needed, achieving an optimized balance between weight reduction and structural integrity.
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 solution allows for the integration of lightweight aluminum with high-strength steel while preventing corrosion, utilizing minimal material and ensuring strong adhesion by filling small clearances with expandable adhesive, thus overcoming the limitations of existing technologies.
Implementation Method 1
The shaped polymeric carrier is configured for carrying the thermally expandable structural adhesive material, spacing the first member from the second member prior to activation for thermal expansion of the structural adhesive material
Data Source
AI summary
A device and method for the protection of a first member and second member from corrosion by utilizing a connector that bonds the members without allowing direct contact of the members.