Composite Pipe Reinforcement for Conductivity and Bend Stiffness
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Solution Overview
Problem
Composite fuel pipes in aerospace and automotive applications face challenges in balancing electrical conductivity and stiffness, particularly in complex geometries, where pressurized flow can cause deformation and disconnection from end connectors due to inadequate stiffness and potential electrical discharge issues from lightning strikes.
Innovation Solution
A fiber-reinforced polymer composite pipe design featuring a continuous first material with electrically conductive fiber reinforcement or additives for electrical conductivity and a discontinuous second material with carbon fiber reinforcement for increased stiffness at non-linear portions, ensuring no discontinuity in electrical conduction while providing tailored resistance and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon fiber reinforcement is used throughout the pipe to increase stiffness, then axial stiffness is improved, but electrical conductivity becomes excessively high causing potential electrical discharge from lightning strikes
Solution Approach 1:
The patent applies different fiber reinforcement types at different locations: glass fiber reinforcement in linear portions and carbon fiber reinforcement only in non-linear portions (bends, elbows, tees). This local differentiation provides enhanced stiffness where needed while maintaining electrical safety in straight sections.
Solution Approach 2:
The pipe is segmented into linear portions and non-linear portions, with each segment using appropriate fiber reinforcement. The discontinuous placement of carbon fiber reinforcement in non-linear portions creates distinct functional zones within the pipe structure.
2Adaptability or versatility
If the pipe is formed with complex non-linear geometries to meet routing requirements, then adaptability is improved, but structural stability deteriorates due to deformation under pressurized flow
Solution Approach 1:
The patent reinforces only the non-linear portions (bends, elbows, tees) with carbon fiber reinforcement while leaving linear portions with glass fiber reinforcement. This local reinforcement strategy maintains structural stability at critical stress points without over-stiffening the entire pipe.
Solution Approach 2:
The patent uses a composite structure combining glass fiber reinforcement and carbon fiber reinforcement in the same pipe. The glass fiber provides baseline strength and electrical safety, while carbon fiber provides enhanced stiffness where geometric complexity creates vulnerability.
3Object-affected harmful factors
If glass fiber reinforcement is used throughout the pipe, then electrical safety is improved by maintaining appropriate resistivity, but axial stiffness becomes insufficient to withstand pressurised flow in non-linear portions
Solution Approach 1:
The patent uses glass fiber reinforcement in linear portions to maintain electrical safety and appropriate resistivity, while switching to carbon fiber reinforcement in non-linear portions where higher stiffness is required to withstand pressurized flow.
Solution Approach 2:
The pipe is divided into segments with different reinforcement types: glass fiber in straight sections for electrical safety and carbon fiber in bent sections for structural support under pressure.
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 design achieves balanced electrical conductivity and axial stiffness, preventing deformation and ensuring reliable connection of composite pipes with complex geometries, meeting both electrical and mechanical requirements for pressurized applications.
Implementation Method 1
having an electrical resistivity determined by an electrically conductive fiber reinforcement and/or an electrically conductive additive in the polymer matrix
Implementation Method 2
the second material being a carbon fiber reinforced polymer material comprising carbon fiber reinforcement in a polymer matrix and having an elastic modulus provided by the carbon fiber reinforcement
Data Source
AI summary
A fiber reinforced polymer composite pipe includes first and second ends and defines a central axis running in a longitudinal direction from the first end to the second end, and the pipe including at least one non-linear portion along the central axis between the first end and the second end. A first material extends continuously from the first end to the second end, the first material being a fiber reinforced polymer material comprising fiber reinforcement in a polymer matrix and having an electrical resistivity determined by an electrically conductive fiber reinforcement and/or an electrically conductive additive in the polymer matrix; and a second material arranged at the at least one non-linear portion and extending discontinuously between the first end and the second end, and has an elastic modulus greater than the elastic modulus of the first material in the longitudinal direction.