Composite Prepreg Surface Resin Quantification via Fluid Pickup
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Solution Overview
Problem
Inadequate bonding between layers of composite prepregs in aerospace manufacturing due to insufficient tackiness, which can lead to defects and weakened components, is a challenge that existing methods have not effectively addressed.
Innovation Solution
A method to quantify the surface resin of composite prepregs by measuring the fluid pickup percentage, where a specimen is submerged in a fluid to determine its wet weight after soaking, and comparing this to a predefined threshold to classify the prepreg as usable or unusable based on its tackiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods are used to assess tackiness, then the manufacturing process can proceed, but inadequate bonding between layers occurs leading to defects and weakened components
Solution Approach 1:
The patent replaces subjective mechanical assessment of tackiness with an objective fluid absorption measurement system. By measuring the amount of fluid absorbed by the prepreg surface, the method provides a quantifiable metric that correlates with tackiness, eliminating the difficulty of measuring this property through traditional means.
Solution Approach 2:
The patent introduces fluid absorption as an intermediary measurement to assess tackiness indirectly. Instead of measuring tackiness directly, the method uses fluid absorption percentage as a mediator that correlates with the adhesive properties of the resin, making the measurement feasible and reliable.
2Manufacturing precision
If the amount of surface resin is not accurately measured, then the manufacturing process is faster, but inadequate bonding occurs between layers
Solution Approach 1:
The patent extracts the critical measurement of surface resin content from the complex quality control process by focusing on a single, measurable parameter: fluid absorption percentage. This simplified measurement approach maintains manufacturing precision while significantly reducing the time and complexity of quality assessment.
Solution Approach 2:
The patent changes the measurement parameter from subjective tackiness assessment to objective fluid absorption percentage. This parameter transformation enables quick, standardized measurements that can be rapidly compared against threshold values, maintaining precision while improving manufacturing speed.
3Ease of operation
If a simple weighing method is used to measure fluid pickup, then the measurement process is quick and easy, but it accurately quantifies surface resin levels to ensure bonding quality
Solution Approach 1:
The patent enables the prepreg material to self-indicate its resin content through fluid absorption. The material itself performs the measurement function by absorbing fluid in proportion to its surface resin levels, making the measurement process simple and intuitive while maintaining accuracy.
Solution Approach 2:
The patent replaces complex analytical measurement systems with a simple weighing-based fluid absorption test. This substitution maintains measurement precision by using the fundamental physical property of mass change, while dramatically improving ease of operation.
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 the rejection of prepregs with inadequate tackiness, thereby ensuring the quality and strength of manufactured components by accurately assessing the surface resin levels and ensuring sufficient bonding during the manufacturing process.
Implementation Method 1
submerging the first specimen in a container containing a fluid, removing the first specimen from the container, weighing, for a second time, the first specimen to obtain a wet weight of the first specimen
Data Source
AI summary
An example of a method of manufacturing a component from a composite prepreg includes collecting a specimen from the composite prepreg and quantifying an amount of surface resin of the specimen by submerging the specimen in a container containing a fluid to determine a fluid pickup percentage. Responsive to a determination that the fluid pickup percentage exceeds a predefined threshold value, forming a component from the composite prepreg.