Shape Memory Alloy Coating for Rotor Blade Protection

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Solution Overview

Problem

Conventional rotor blades made of composite materials are prone to environmental degradation such as erosion, cavitation, and foreign object impact damage, and existing solutions are often expensive and not suitable for scalable production.

Innovation Solution

Applying a shape memory alloy coating to the outer surface of rotor blades to provide protection against erosion, corrosion, and foreign object impact, while offering enhanced performance benefits and cost-effectiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional composite materials are used for rotor blades, then manufacturing cost and scalability are reduced, but the blades are prone to environmental degradation such as erosion, cavitation, and foreign object impact damage

Engineering Contradiction:

Improveresistance to environmental degradationVSAvoiderosion, cavitation, and foreign object impact damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies shape memory alloy (SMA) composite material to the rotor blade outer surface. The SMA coating is applied over the conventional composite blade structure to create a multi-layer composite system. This SMA-composite combination provides enhanced resistance to erosion, cavitation, and foreign object impact while maintaining manufacturing scalability through established coating processes.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The shape memory alloy undergoes phase transformation between martensite and austenite states in response to temperature changes or applied stress. This parameter change enables the material to dynamically adjust its mechanical properties - becoming more rigid under impact to absorb energy, and returning to its original shape to provide continuous protection against environmental degradation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If shape memory alloy coating is applied to protect against environmental degradation, then protection against erosion and foreign object impact is improved, but the manufacturing process becomes more complex

Engineering Contradiction:

Improveprotection against erosion and foreign object impactVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The shape memory alloy coating is applied to the rotor blade outer surface before the blade enters service. This preliminary protective action ensures that the blade is pre-protected against erosion, cavitation, and foreign object impact from the outset. The coating is applied using established industrial coating processes that can be integrated into existing manufacturing lines.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The shape memory alloy provides self-healing protection through its shape memory effect. When damage occurs or the blade experiences thermal cycling, the SMA material automatically transforms phases to restore its protective function without requiring external intervention or maintenance. This self-service capability simplifies operational complexity while maintaining high reliability.

Inventive Principle:

Principle #25Self-service

3Reliability

If shape memory alloy is used to enhance blade protection, then resistance to corrosion and cavitation is improved, but the cost of manufacturing may increase

Engineering Contradiction:

Improveresistance to corrosion and cavitationVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The shape memory alloy coating is applied specifically to the outer surface of the rotor blade where environmental degradation and impact damage occur, rather than throughout the entire blade structure. This localized application provides targeted protection against corrosion and cavitation while minimizing material cost. The inner blade structure retains its conventional composite construction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The shape memory alloy coating can be applied using processes that utilize recovered or recycled materials, and the coating itself can be repaired or renewed if damaged. This approach reduces the overall manufacturing cost by avoiding the need to replace entire blade sections, while maintaining the enhanced corrosion and cavitation resistance provided by the SMA layer.

Inventive Principle:

Principle #34Discarding and recovering

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

The shape memory alloy coating effectively resists environmental degradation and foreign object damage, providing improved protection and scalability for industrial production without increasing weight or cost.

Implementation Method 1

applying one or more shape memory alloys to the outer surface of the blade structure so as to form an outer protection layer

Methodology Applied

Scientific EffectShape memory alloy: Shape Memory Alloy

Data Source

PatentEP3848573B1Methods for manufacturing blade structures

Publication Date: 2023.01.25 GENERAL ELECTRIC CO

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AI summary

A method for manufacturing a blade structure includes providing the blade structure comprising an outer surface having an aerodynamic profile. The method also includes applying one or more shape memory alloys to the outer surface of the blade structure so as to form an outer protection layer on at least a portion of the blade structure. Moreover, the method includes securing the one or more shape memory alloys to the blade structure.