Undulated Ceramic Matrix Composite Hangers for Gas Turbine Engines

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Solution Overview

Problem

Ceramic matrix composite components in gas turbine engines face stress limitations, necessitating increased strength and rigidity to withstand operational stresses without material modification.

Innovation Solution

Incorporating undulated portions with arcuate peaks and troughs in ceramic matrix composite hangers to increase stiffness, allowing direct engagement with metallic brackets while using coating materials to control engagement points and prevent grinding into the composite material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If ceramic matrix composite components are used in gas turbine engines, then weight is reduced and temperature resistance is improved, but stress承受能力 is insufficient

Engineering Contradiction:
Improvetemperature resistanceVSAvoidstress承受能力
Core Design Contradiction:
TemperatureVSStrength

Solution Approach 1:

The patent applies curved/arcuate geometries to the hanger structure, specifically using arcuate peaks and troughs in the hanger design. These curved features increase the structural stiffness and stress-bearing capacity of the ceramic matrix composite hanger without changing the material itself, thereby resolving the contradiction between using temperature-resistant ceramics and achieving sufficient stress承受能力.

Inventive Principle:
Principle #14Spheroidality (Curvature)

2Strength

If the hanger structure is made stiffer to withstand stresses, then stress承受能力 is improved, but the complexity of the component increases

Engineering Contradiction:
Improvestress承受能力VSAvoidcomponent complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The hanger is divided into distinct functional segments: arcuate peaks, arcuate troughs, and straight portions. Each segment serves a specific purpose in distributing stresses and engaging with mating structures. This segmentation allows the complex stiffening geometry to be systematically organized and manufactured, reducing the practical complexity despite the increased structural sophistication.

Inventive Principle:
Principle #1Segmentation

3Manufacturing precision

If coating material is added to control engagement points, then manufacturing precision is improved, but the device complexity increases

Engineering Contradiction:
Improveengagement point controlVSAvoidstructure complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

Coating material is applied selectively to specific localized areas of the hanger, particularly to the arcuate troughs where engagement with the bracket occurs. This local application of coating provides precise control over engagement points and tolerances only where needed, rather than uniformly increasing complexity across the entire component.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS10060294B2Gas turbine engine assemblies with ceramic matrix composite components having undulated features
Publication Date: 2018.08.28 ROLLS ROYCE HIGH TEMPERATURE COMPOSITES INC
  • US10060294B2 patent drawing
  • US10060294B2 patent drawing
  • US10060294B2 patent drawing

AI summary

An assembly adapted for use in a gas turbine engine is disclosed herein. The assembly includes a first component including metallic materials and a second component including ceramic matrix composite materials. A portion of the second component is configured to engage a portion of the first component directly so that the second component is supported in a predetermined position.