Composite Duct Panel Corner Bracket Design
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Solution Overview
Problem
Composite materials pose manufacturing difficulties, such as poor consolidation and wrinkling, in forming well-defined three-dimensional corners, which increases manufacturing time and costs, particularly in aircraft components like duct panels.
Innovation Solution
The use of corner brackets made from different materials, such as metal, plastic, or composite materials, coupled to composite duct panels to replace composite corners, improving corner structure and reducing manufacturing challenges by providing a solid, planar connection and enhancing structural characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If composite materials are used to form three-dimensional corners, then weight is reduced, but manufacturing precision deteriorates due to poor consolidation, ply orientation rotation, bunching, and wrinkling
Solution Approach 1:
The corner structure is segmented into two parts: a composite panel body and a separate corner reinforcement element. The corner element is a distinct component that couples to the composite panel at the corner region, allowing the composite material to maintain its weight advantage while the separate element provides the precise geometric definition and structural reinforcement needed for well-formed corners.
Solution Approach 2:
The solution uses a hybrid construction combining composite materials (for the panel body) with a corner element made from alternative materials such as metal, plastic, or different composite configurations. This composite approach allows each material to be used where it performs best: the lightweight composite for the main panel and a more structurally robust material for the corner reinforcement.
2Weight of moving object
If composite materials are used to form three-dimensional corners, then weight is reduced, but manufacturing time increases due to additional machining and manufacturing difficulties
Solution Approach 1:
The corner element is pre-formed as a separate component with the precise geometry and reinforcement characteristics required for the corner region. This preliminary fabrication of the corner element allows it to be manufactured independently using optimal processes for that specific component, then assembled to the composite panel, thereby avoiding time-consuming in-situ corner formation operations.
Solution Approach 2:
By dividing the corner structure into a separate couplable element rather than forming it monolithically with the panel, the manufacturing process is segmented into independent operations. The corner element can be pre-manufactured and then attached to the panel, significantly reducing the overall manufacturing time compared to attempting to machine or form the corner directly on the composite panel.
3Weight of moving object
If composite materials are used to form three-dimensional corners, then weight is reduced, but structural characteristics deteriorate due to poor consolidation and ply orientation issues
Solution Approach 1:
The corner reinforcement element is constructed from materials better suited for providing structural strength and rigidity in the corner region, such as metal or heavily reinforced composite. This element acts as a structural enhancement that compensates for the inherent weaknesses of composite materials in three-dimensional corner formations, providing the necessary strength while the main panel remains lightweight composite.
Solution Approach 2:
The corner element provides localized reinforcement specifically at the corner region where structural demands are highest. Rather than making the entire panel heavier, the reinforcement is applied locally only where needed, maintaining the overall lightweight characteristic of the composite panel while strengthening the critical corner areas through the attached reinforcement element.
Data Source
AI summary
A composite duct panel assembly is provided. The composite duct panel assembly includes a composite duct panel having a curved cross-section in a circumferential direction and a width based on the panel including a portion of a circumference of an annular bypass duct. In one embodiment, at least two adjacent corners of the panel are greater than 90°. In one embodiment, the panel includes a circumferential flange along a circumferential edge and an axial flange along an axial edge, and the assembly further includes a corner bracket coupled to the panel, the circumferential flange, and the axial flange. The corner bracket includes a flange corner having an approximate 90° angle, the flange corner extending the axial flange and the circumferential flange to an intersection at a corner of the panel.