Thermal Oxidation Test Fixture for One-Sided Material Exposure

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Solution Overview

Problem

Existing thermal oxidative stability testing methods expose the entire specimen to an oxidizing environment, leading to overly conservative predictions of actual thermal degradation, as they do not mimic the real-world exposure conditions where only one side of a component is subjected to oxidation.

Innovation Solution

The development of test fixtures and methods that expose the frontside of a material under test to an oxidizing environment and the backside to an inert environment, isolated from the oxidizing environment, using pressure vessels and controlled gas systems to simulate real-world conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the entire specimen is exposed to oxidizing environment, then the test covers all surfaces, but the test results become overly conservative and do not reflect actual service conditions

Engineering Contradiction:

Improveaccuracy of degradation predictionVSAvoidalignment with real-world exposure conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The specimen is divided into two distinct sides with different exposure conditions: one side exposed to oxidizing environment and the other side protected in inert atmosphere. This segmentation allows the test to simulate real-world scenarios where only certain surfaces are exposed to degradation conditions, improving the accuracy of service life predictions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different environmental conditions are applied to different regions of the specimen. The front surface experiences oxidizing conditions while the back surface remains protected, creating local quality variations that match actual service conditions where only exposed surfaces undergo thermal oxidative degradation.

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If both sides of the specimen are exposed to oxidizing environment, then complete coverage is achieved, but the test over-predicts thermal oxidative degradation

Engineering Contradiction:

Improveexposure coverageVSAvoiddegradation prediction accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

An inert atmosphere (nitrogen or argon) is introduced to protect one side of the specimen from oxidation. This creates a controlled environment where only the intended exposure surface degrades, preventing over-prediction of material lifetime while maintaining sufficient exposure coverage on the critical surface.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

A physical barrier (foil or container) acts as an intermediary between the oxidizing environment and the backside of the specimen. This mediator selectively blocks oxidation from reaching the protected surface while allowing the front surface to experience controlled degradation, improving measurement precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a barrier is introduced to protect one side of the specimen, then realistic exposure conditions are simulated, but the device complexity increases

Engineering Contradiction:

Improvefidelity of testingVSAvoidtest fixture structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Thin foil barriers (aluminum or other suitable materials) are used to protect one side of the specimen. These flexible, thin-film barriers are easy to implement and remove, providing realistic exposure conditions without significantly increasing device complexity. The foils can be simply placed over the specimen surface and secured with minimal additional hardware.

Inventive Principle:

Principle #30Flexible shells and thin films

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 improves the fidelity of thermal oxidative stability testing by accurately predicting the degradation of materials, aligning with actual exposure conditions and providing more precise results.

Implementation Method 1

thermal oxidative stability testing

Methodology Applied

Scientific EffectThermal oxidation: Oxidation

Implementation Method 2

expose a frontside of the material under test to a first environment and to expose a backside of the material under test to a second environment

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20260043735A1Test fixtures and methods for improving fidelity of thermal oxidative stability testing

Publication Date: 2026.02.12 THE BOEING CO

AI summary

A test fixture for improving fidelity of thermal oxidative stability testing includes an environmental test chamber and a test material holder. The environmental test chamber includes an enclosure and a controller. The enclosure with an opening that provides access to an internal compartment defining a chamber environment. The controller controls the chamber environment within the internal compartment. The test material holder, at least partially disposed in the internal compartment, holds a material under test. The environmental test chamber and the test material holder expose a frontside of the material under test to a first environment and expose a backside of the material under test to a different environment. Various test fixtures and methods for improving fidelity for thermal oxidative stability testing are provided.