Continuous Fiber Deposition for Composite Weight Reduction

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Solution Overview

Problem

Conventional composite manufacturing methods result in increased weight due to inefficient fiber orientation and limitations in implementing advanced structural designs, as they rely on laminar construction and sequential layering of composite materials.

Innovation Solution

A system and method for additive manufacturing of composite parts using a delivery assembly that deposits a continuous flexible line comprising a non-resin component and a photopolymer resin component, with controlled application and curing of the resin to achieve desired orientations and properties within the composite part.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If laminar construction with sequential layering of composite materials is used, then manufacturing process is simplified, but fiber orientation efficiency decreases and weight increases

Engineering Contradiction:
Improvemanufacturing process simplicityVSAvoidpart weight
Core Design Contradiction:
Ease of manufactureVSWeight of moving object

Solution Approach 1:

The patent changes the fundamental manufacturing parameter from sequential layering to continuous strand deposition. The continuous flexible line allows fibers to be deposited in their final oriented position throughout the part volume, eliminating the need for multiple laminar layers and reducing overall part weight while maintaining structural integrity.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention transitions from two-dimensional laminar construction to three-dimensional continuous strand placement. The continuous flexible line can be deposited in complex spatial paths, allowing optimal fiber orientation in all three dimensions rather than being constrained to planar layers, thus reducing weight while achieving superior structural efficiency.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If laminar construction is used, then manufacturing process is conventional and established, but implementation of advanced structural designs is limited

Engineering Contradiction:
Improvemanufacturing process familiarityVSAvoiddesign flexibility
Core Design Contradiction:
Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent introduces dynamic capabilities to the manufacturing process through the continuous flexible line deposition system. The line can be dynamically routed through complex paths, changed in material composition on-the-fly, and deposited in varying orientations, enabling advanced structural designs that are impossible with static laminar construction methods.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The invention enables local quality variations by allowing different materials and fiber orientations to be deposited at different locations within the same part. The continuous flexible line system can selectively change material properties and structural characteristics at specific positions, achieving optimized local performance for advanced designs.

Inventive Principle:
Principle #3Local quality

3Strength

If sequential layering of multiple plies is used, then composite material structure is achieved, but reinforcement fiber orientation efficiency decreases

Engineering Contradiction:
Improvecomposite structure integrityVSAvoidfiber orientation precision
Core Design Contradiction:
StrengthVSManufacturing precision

Solution Approach 1:

The patent implements continuity by using a single continuous flexible line that passes through the entire part volume. This eliminates the discontinuities inherent in sequential layering of multiple plies, allowing reinforcement fibers to maintain continuous load paths and optimal orientation throughout the structure, thereby improving both strength and orientation precision.

Inventive Principle:
Principle #20Continuity of useful action

Solution Approach 2:

The invention applies preliminary action by pre-orienting the continuous flexible line along the optimal stress paths before deposition. The fiber reinforcement is laid down in its final desired orientation configuration throughout the part volume in a single continuous operation, rather than attempting to achieve proper orientation through multiple sequential layers.

Inventive Principle:
Principle #10Preliminary action

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 allows for the creation of composite parts with optimized fiber orientation and advanced structural designs, reducing weight and enhancing properties such as strength and stiffness, while enabling the selection of different materials at various locations within the part.

Implementation Method 1

The continuous flexible line comprises the non-resin component and further comprises a photopolymer-resin component that comprises at least some of the photopolymer resin applied to the non-resin component by the delivery assembly. The source of the curing energy is configured to deliver the curing energy at least to a portion of the segment of the continuous flexible line

Methodology Applied
Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentEP3124215B1System for additively manufacturing composite parts
Publication Date: 2020.04.29 THE BOEING CO
  • EP3124215B1 patent drawingFigure 1
  • EP3124215B1 patent drawingFigure 2
  • EP3124215B1 patent drawingFigure 3

AI summary

A system (100) for additively manufacturing a composite part (102) comprises a delivery assembly (266), a feed mechanism (104), and a source (116) of curing energy (118). The delivery assembly (266) comprises a delivery guide (112) movable relative to a surface (114) and is configured to deposit a continuous flexible line (106) along a print path (122). The delivery assembly (266) further comprises a first inlet (170), configured to receive a non-resin component (108), and a second inlet (250), configured to receive a photopolymer resin (252). The delivery assembly (266) applies the photopolymer resin (252) to the non-resin component (108). The feed mechanism (104) pushes the continuous flexible line (106) out of the delivery guide (112). The source (116) of the curing energy (118) delivers the curing energy (118) to a portion (124) of the continuous flexible line (106) after it exits the delivery guide (112).