Test Fabric Design for Adhesion Testing of Fiber Composites
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Solution Overview
Problem
Existing methods for testing the adhesion of materially bonded joining connections, particularly in fiber composite materials, are complex, costly, and prone to falsification due to fabric tearing during mechanical testing, which complicates the determination of admissible parameter spaces and bond quality.
Innovation Solution
A method involving the use of a Dutch-weave or square-mesh fabric as a test fabric, which allows adhesive penetration and eliminates edge tearing by creating a cohesive fracture, enabling accurate adhesion testing without edge sealing, and can be produced efficiently and cost-effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coarse-meshed fabric with large pores is used to enable adhesive penetration and cohesive fracture, then adhesion testing capability is improved, but fabric strength decreases leading to edge tearing during mechanical testing
Solution Approach 1:
The fabric is segmented into different regions with different mesh sizes: the central test region uses coarse-meshed fabric with large pores for adhesive penetration and cohesive fracture, while the edge regions use fine-meshed fabric for strength and tear resistance. This segmentation allows each region to fulfill its specific function without compromise.
Solution Approach 2:
Different regions of the fabric are assigned different qualities: the central area has high porosity for adhesion testing while the edges have low porosity for structural integrity. This local differentiation resolves the contradiction between needing open pores for adhesive penetration and requiring strong edges to prevent tearing.
2Reliability
If edge sealing is applied to prevent fabric tearing, then test result reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The fabric is designed with predetermined regional differentiation before testing, where edge regions are inherently stronger due to fine mesh construction. This preliminary structural preparation eliminates the need for additional edge sealing operations, reducing manufacturing complexity while maintaining reliability.
3Strength
If fine-meshed fabric is used to prevent tearing, then fabric strength is improved, but adhesive penetration capability decreases affecting adhesion verification
Solution Approach 1:
The fabric is divided into functional zones: a central test zone with coarse mesh for adhesive penetration and a surrounding edge zone with fine mesh for strength. This segmentation allows both requirements to be satisfied simultaneously in different locations.
Solution Approach 2:
The fabric exhibits spatially varying porosity and strength characteristics, with high porosity in the center for adhesive interaction and low porosity at edges for mechanical integrity, resolving the contradiction between penetration capability and strength.
4Reliability
If large sealing edges are used to prevent fabric tearing, then test reliability is improved, but substrate size requirements increase leading to higher costs
Solution Approach 1:
The fabric's edge regions are pre-designed with fine mesh construction that inherently provides tear resistance without requiring large sealing margins. This preliminary structural design reduces the required substrate size while maintaining test reliability.
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 approach provides accurate, unfalsified test results with reduced costs and increased efficiency by preventing fabric tearing and eliminating the need for edge sealing, allowing better identification of bond quality characteristics.
Implementation Method 1
a Dutch-weave fabric and/or a square-mesh fabric is provided and used as the test fabric
Implementation Method 2
creates a cohesive fracture, enabling accurate adhesion testing
Data Source
AI summary
The invention relates to a method for producing a test body (30) for mechanically destructively testing a materially bonded joining connection, wherein the method comprises the following steps:providing an areal fiber composite substrate formed from a fiber composite material which has a fiber material and matrix material in which the fiber material is embedded,applying at least one test fabric and an adhesive to a substrate surface of the areal fiber composite substrate, andcuring the adhesive, and therefore a materially bonded joining connection is produced between the test fabric and the substrate surface by way of the cured adhesive,wherein a Dutch-weave fabric and/or a square-mesh fabric is provided as the test fabric.