Sealant Rigid Components Mechanical Lock Joint Strength
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Solution Overview
Problem
Existing joint assemblies face issues with slippage, weakened bonds due to material deformation and exposure to temperature variances, leading to reduced structural rigidity and increased risk of corrosion between dissimilar materials.
Innovation Solution
A method involving a sealant material with rigid components that forms a mechanical lock by displacing and deforming under fastener pressure, reducing slippage and maintaining joint position, while the matrix material seals the joint from environmental exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant material is used between substrates to connect surfaces, then sealing and adhesive function are provided, but slippage occurs during handling causing joint weakening
Solution Approach 1:
The sealant material is formulated as a composite containing a curable adhesive matrix and rigid components (such as glass beads, metal particles, or ceramic spheres). This composite structure combines the bonding capability of the adhesive with the mechanical interlocking and slippage resistance of the rigid components, resolving the contradiction between providing sealing/adhesive function and preventing slippage during handling.
2Strength
If substrates are joined using fasteners with inherent gaps, then mechanical connection is achieved, but slip load is reduced due to play between hole and rivet
Solution Approach 1:
The rigid components within the sealant material change the mechanical parameters of the joint by providing distributed contact points and increasing friction. The presence of these rigid particles modifies the stress distribution and reduces the effective gap play between fastener and substrate, thereby increasing slip load and structural rigidity without requiring tighter manufacturing tolerances.
3Object-affected harmful factors
If sealing material is used to protect from environmental exposure, then corrosion protection is provided, but material deformation at elevated temperatures causes sealant expulsion
Solution Approach 1:
The composite sealant material combines a temperature-resistant curable adhesive with rigid components that maintain dimensional stability at elevated temperatures. This composite formulation prevents sealant expulsion while maintaining corrosion protection, as the rigid components provide structural integrity and the curable adhesive maintains sealing function under thermal stress.
4Strength
If dissimilar materials are joined directly, then structural connection is achieved, but galvanic corrosion and contact corrosion occur
Solution Approach 1:
The curable adhesive sealant material serves as an intermediary barrier between dissimilar substrates. This intermediate layer electrically and chemically isolates the dissimilar materials, preventing galvanic and contact corrosion while maintaining strong mechanical attachment. The rigid components within the sealant further enhance this protective barrier function.
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
The solution significantly enhances joint strength, reduces slippage by up to 300% compared to similar structures without rigid components, and prevents corrosion by limiting direct contact between dissimilar materials.
Implementation Method 1
a depression is formed by plastic deformation in the first or second connection regions by the rigid components
Implementation Method 2
the protection of two or more joined components from direct contact of dissimilar materials, corrosion, galvanic corrosion, contact corrosion
Data Source
AI summary
A method for improving joint strength between a first and second member comprising the steps of: applying a sealant material including a matrix material at least partially encasing rigid components to the first and second members; joining the first and second members upon an application of force that is applied through the use of one or more fasteners; wherein a compressive force is applied to the exterior surface of both the first and second members by the one or more fasteners while the rigid components apply an internal tension force acting opposite of the compression force to the interior surface of both the first and second members proximate to the fastener to form a mechanical lock thereby reducing slippage and generally maintaining the joint in position.