Composite Porosity Standards via Curing Parameter Control
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Solution Overview
Problem
The fabrication of porosity reference standards for composite materials is complex, time-consuming, and expensive, and existing artificial standards do not accurately represent natural porosity, making it difficult to calibrate ultrasonic testing equipment effectively.
Innovation Solution
A method involving the selection of curing processes for uncured composite coupons, followed by curing, porosity measurement, and correlation to create porosity standards that represent a range of percent porosities, allowing for the creation of a porosity tree to rank curing processes based on porosity results and validate composite component porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to fabricate porosity reference standards with artificial materials, then porosity standards can be created, but the standards do not accurately represent natural porosity and provide inaccurate attenuation measurements
Solution Approach 1:
The patent changes the fundamental parameter of porosity creation from artificial simulation to natural occurrence. Instead of using artificial materials to simulate porosity, the method utilizes naturally occurring porosity in composite materials by varying curing parameters (temperature, pressure, time) to produce different natural porosity levels, thereby achieving both accurate porosity representation and reliable attenuation measurements
Solution Approach 2:
The patent creates accurate copies of natural porosity conditions rather than using artificial substitutes. By curing composite materials under different controlled conditions, the method produces reference standards that replicate the natural porosity characteristics found in actual composite components, ensuring both measurement accuracy and attenuation reliability
2Quantity of substance
If random selection of testing sites is used in traditional fabrication methods, then porosity measurements can be taken, but the process requires multiple iterations of coupon fabrication and measurements, making it time-consuming and expensive
Solution Approach 1:
The patent performs preliminary action by systematically controlling the curing process to pre-determine specific porosity levels before measurement. By establishing a correlation between curing parameters and resulting porosity, the method eliminates the need for random sampling and multiple iterative fabrications, significantly reducing both the quantity of coupons needed and the overall fabrication time
Solution Approach 2:
The patent implements feedback by measuring porosity of initially fabricated coupons and using this information to adjust and optimize subsequent curing processes. This feedback loop allows for the development of a porosity tree that predicts porosity outcomes based on curing parameters, reducing the need for repeated random sampling and iterations
3Adaptability or versatility
If multiple iterations of coupon fabrication and porosity measurements are performed, then reference standards representing a range of percent porosities can be formed, but the process becomes very expensive
Solution Approach 1:
The patent achieves adaptability across a range of porosity levels by systematically varying curing parameters (temperature, pressure, time) rather than through multiple random fabrications. This approach allows the creation of reference standards representing different porosity percentages through controlled parameter changes, significantly reducing the number of iterations needed and thereby lowering fabrication costs
Solution Approach 2:
The patent performs preliminary curing experiments to establish the relationship between curing parameters and resulting porosity levels. This preliminary action creates a porosity tree that can predict porosity outcomes, allowing for the efficient fabrication of reference standards across the desired porosity range without requiring expensive multiple iterations
Data Source
AI summary
A method for fabricating composite porosity standards may include the steps of providing a plurality of uncured composite coupons, each uncured composite coupon being formed from a composite material, providing a plurality of curing processes, selecting a curing process for each of the uncured composite coupons, curing each uncured composite coupon in accordance with a selected curing process to form a plurality of cured composite coupons, each cured composite coupon being formed from the composite material and having a percent porosity, measuring the percent porosity of each cured composite coupon, and correlating each measured percent porosity of a plurality of measure percent porosities to a corresponding cured composite coupon of the plurality of cured composite coupons to form a plurality of porosity standards.