Composite Core Sandwich Coupon Conditioning for Faster Moisture Aging
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Solution Overview
Problem
Existing methods for conditioning composite core materials are time-consuming, making it impractical to test materials for their full expected useful lifetime, especially when incorporating moisture, which can take months or years, and may lead to over-engineering due to inaccurate humidity levels.
Innovation Solution
A method and system for accelerated conditioning of composite core sandwich coupons using a conditioning apparatus with controlled temperature and humidity settings, where a first temperature above room temperature is maintained to achieve a desired relative humidity level in the core layer, followed by a reduction in temperature to allow the outer composite layer to absorb moisture, thereby expediting the conditioning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conditioning methods are used to achieve accurate humidity levels in composite core materials, then material performance reliability is improved, but the conditioning time becomes excessively long (months or years)
Solution Approach 1:
The patent applies parameter changes by elevating the temperature above room temperature during the conditioning process. This temperature parameter change accelerates moisture diffusion into the core material, reducing conditioning time from months or years to a much shorter duration while still achieving the desired humidity level for reliable material performance testing.
2Productivity
If accelerated conditioning methods are used to reduce testing time, then productivity is improved, but the risk of over-saturation and loss of material strength increases
Solution Approach 1:
The patent applies dynamics by implementing a two-stage conditioning process with dynamic adjustment of temperature and humidity parameters. The first stage uses elevated temperature and controlled humidity to accelerate moisture diffusion. The second stage reduces temperature to allow moisture redistribution and prevent over-saturation, thereby maintaining material strength while achieving accelerated conditioning.
Solution Approach 2:
The patent applies periodic action through its two-stage conditioning methodology. The process alternates between an acceleration phase (elevated temperature with controlled humidity) and a stabilization phase (reduced temperature for moisture redistribution). This periodic approach enables rapid conditioning while preventing harmful over-saturation that would compromise material strength.
3Speed
If high humidity levels are applied to accelerate moisture absorption, then the conditioning speed is improved, but the outer composite layer becomes over-saturated causing material degradation
Solution Approach 1:
The patent applies local quality by differentiating the humidity requirements for different regions of the composite material. The core layer receives elevated humidity to accelerate moisture diffusion, while the outer composite layer is protected from over-saturation through temperature reduction in the second stage. This localized approach to humidity control enables fast conditioning without compromising the outer layers.
Solution Approach 2:
The patent applies preliminary action by first accelerating moisture diffusion into the core at elevated temperature and humidity, then subsequently reducing the temperature to allow controlled moisture redistribution to the outer layers. This preliminary acceleration followed by controlled redistribution prevents over-saturation while achieving the desired humidity levels throughout the material.
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 significantly reduces the time required for conditioning while ensuring accurate humidity levels, preventing over-saturation and maintaining material strength, thus enabling quicker incorporation of materials into systems like aircraft without over-engineering.
Implementation Method 1
setting, at a first time by a controller of the conditioning apparatus, a first temperature and a first relative humidity level of the conditioning apparatus, wherein the first temperature is above room temperature
Implementation Method 2
a combination of the first temperature and the first relative humidity level correspond to a desired relative humidity level of the plurality of cells of the core layer at room temperature
Implementation Method 3
responsive to adjusting the first temperature to the second temperature, the outer composite layer absorbs moisture from the inner core layer to approach the desired humidity level
Data Source
AI summary
In an example, a method for accelerated conditioning of a composite core sandwich coupon is described. The method includes setting a first temperature and a first relative humidity level of the conditioning apparatus, wherein a combination of the first temperature and the first relative humidity level correspond to a desired relative humidity level of the plurality of cells of the core layer at room temperature. The method includes maintaining the first temperature and the first relative humidity for a first period, wherein during the first period a core humidity of the plurality of cells in the core layer approaches the first relative humidity level. The method includes determining that the core humidity has reached the first relative humidity level. The method includes, based on determining that the core humidity has reached the first relative humidity level, adjusting the first temperature to a second temperature.