Composite Wall Repair Stepped Interface

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Solution Overview

Problem

Existing methods for repairing composite walls with damaged zones either result in a thicker and heavier structure, suboptimal adhesion, increased complexity and cost, or altered mechanical characteristics, failing to efficiently conserve material and maintain original mechanical properties.

Innovation Solution

A method involving material removal to create a hollowed-out zone with stepped interface zones, optimized for each layer's fiber direction, using high-pressure water jet cutting, and producing a replacement part with complementary layers to ensure optimal force recovery and minimal material loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If repair by patch is used to seal damaged area and bond replacement part, then the repair process is simple and fast, but the repaired structure becomes thicker and heavier with suboptimal adhesion

Engineering Contradiction:

Improverepair process simplicityVSAvoidrepaired structure weight

Core Design Contradiction:

Ease of manufactureVSWeight of stationary object

Solution Approach 1:

The repair process is segmented into distinct phases: hollowing out the damaged zone, creating stepped interface zones, producing a replacement part with complementary faces, and assembling. This segmentation allows optimization of each phase independently, achieving both simplicity and lightness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The interface zones are designed with locally optimized geometry where the width varies along the fiber direction to maximize adhesion quality at critical locations while minimizing material removal elsewhere, thus reducing weight without compromising bond strength.

Inventive Principle:

Principle #3Local quality

2Strength

If scarf repair is used to remove material and create recessed area, then the repaired structure maintains original thickness with better adhesion, but the process becomes more complex and expensive

Engineering Contradiction:

Improveadhesion qualityVSAvoidrepair process complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The complex scarf repair is simplified by segmenting the recessed area into standardized stepped interface zones that align with layer junctions. This segmentation provides a systematic approach that reduces complexity while maintaining adhesion quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The replacement part is designed as a composite structure with multiple layers having fibers oriented in the main direction, matching the original wall's composite architecture. This ensures compatible mechanical properties and adhesion without requiring overly complex repair procedures.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If conventional repair methods are used, then material removal is extensive, but this alters the mechanical characteristics and reduces structural integrity

Engineering Contradiction:

Improvematerial removal efficiencyVSAvoidmechanical characteristics

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

Material removal is localized precisely to the damaged zone with interface zones strategically positioned only where needed for adhesion. This local approach minimizes unnecessary material removal while ensuring mechanical characteristics are preserved through optimized force flow paths.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The replacement part uses composite material architecture with fibers oriented in the main direction to match the original structure, ensuring that mechanical characteristics and force flow are restored without requiring extensive material removal from the surrounding healthy structure.

Inventive Principle:

Principle #40Composite materials

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 minimizes material removal, reduces the risk of altering the wall's integrity, achieves optimal force recovery, and maintains mechanical characteristics close to the original structure, while being more economical and efficient than conventional methods.

Implementation Method 1

using high-pressure water jet cutting

Methodology Applied

Scientific EffectHigh-pressure water jet cutting: Jet Erosion

Implementation Method 2

a step of assembling the replacement part to the wall

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP2464505B1Method for repairing a wall consisting of a plurality of layers

Publication Date: 2014.01.01 JEDO TECH

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Figure 4~5
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AI summary

The invention relates to a method for repairing a wall (1), consisting of a plurality of layers (2), each layer including fibers (3) extending in a main direction (4), and having a damaged area (5) over a plurality layers (2). The repair method includes a material removal step consisting of making a recessed area (6) encircling the damaged area (5) and comprising a peripheral area (7) consisting of steps (8) and adapted such that each step defines an interface area (9) having a width (10), the dimension of which in the main direction of the fibers of the lower layer adjoining said interface area (9) is greater than the dimension of said width in directions other than the main direction (4), a step of producing a replacement part (12) suitable for obstructing the recessed area, and a step of assembling the replacement part (12) onto the wall.