Joining Surface Inspection Using Pull-Off Test Textile
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Solution Overview
Problem
Current methods lack a reliable nondestructive testing method to verify the bond strength of adhesive bonds, particularly in fiber composite components, which is critical for safety in aerospace and other applications, and there is no direct method to inspect the effectiveness of a joining surface for adhesive bonding.
Innovation Solution
A method involving a sheetlike test textile with a fiber material and adhesive primer is applied to the joining surface, cured, and then removed to evaluate the surface quality through fracture pattern and removal force analysis, allowing direct inspection of the joining surface without damaging the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive bonding is used to join fiber composite components, then weight-specific strength and design freedom are improved, but reliability of bond strength verification deteriorates due to lack of nondestructive testing methods
Solution Approach 1:
The invention applies a test textile with adhesive primer to the joining surface before the actual bonding process, cures it, and then removes it to create a fracture pattern that reveals surface quality. This preliminary inspection action allows verification of surface preparation effectiveness without damaging the actual component, enabling reliable bond strength verification while maintaining the advantages of adhesive bonding.
2Reliability
If conventional nondestructive testing methods are used, then component integrity is preserved, but the ability to verify adhesive bond strength deteriorates due to lack of direct bond inspection capability
Solution Approach 1:
The invention introduces a test textile with adhesive primer as an intermediary element that bonds to the joining surface and can be subsequently removed to reveal a fracture pattern. This intermediary allows indirect measurement of surface quality and adhesive performance without directly testing the actual bond, thus preserving component integrity while enabling precise assessment of bonding conditions.
3Measurement precision
If the joining surface is inspected directly before bonding, then surface quality assessment is improved, but the ability to predict actual bond performance deteriorates due to lack of adhesive interaction testing
Solution Approach 1:
The invention changes the state of the joining surface by applying and curing adhesive primer, then removing the test textile to create a fracture pattern. This parameter change (from dry surface to primed and fractured surface) allows assessment of both surface quality and adhesive interaction, enabling reliable prediction of actual bond performance while maintaining precise measurement capability.
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 method ensures reliable bonding by evaluating the surface quality and attachment of the adhesive primer, providing a reproducible and precise assessment of the joining surface's capability for subsequent bonding, thus ensuring the quality and safety of adhesive bonds.
Implementation Method 1
a sheetlike test textile (20) which comprises a fiber material (21) and an adhesive primer (22) is applied to at least part of the joining surface (14) of the substrate (10), so that the adhesive primer (22) of the sheetlike test textile (20) comes into contact with the joining surface (14) of the substrate (10)
Implementation Method 2
after the sheetlike test textile (20) has been applied to the joining surface (14), the adhesive primer (22) of the sheetlike test textile (20) is cured
Implementation Method 3
the sheetlike test textile (20) is removed from the joining surface (14), preferably by the exertion of a force on the test textile substantially orthogonally to the joining surface and in a direction away from the joining surface. The joining surface can then be subsequently examined by qualitative evaluation of the fracture pattern
Data Source
AI summary
A method for inspecting a joining surface (14) of a substrate, wherein a component is to be adhered to the joining surface of the substrate by means of an adhesive material (27), wherein the method comprises the following steps: •—providing at least one planar test textile (20), which has a fiber material (21) and an adhesive primer (22), •—applying the planar test textile to at least one part of the joining surface of the substrate to which the component is to be adhered so that the adhesive primer of the planar test textile contacts the joining surface of the substrate, •—at least partially curing the adhesive primer of the planar test textile in order to integrally bond the planar test textile to the substrate by means of the adhesive primer, •—pulling off the planar test textile after at least partially curing the adhesive primer and inspecting the joining surface by means of a qualitative evaluation of the fracture pattern between the cured adhesive primer and the planar test textile and/or by means of a quantitative evaluation of the pull-off force determined when pulling off the planar test textile.