Co-Bonded Composite Strut Reinforcement for Compression Loads
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Solution Overview
Problem
Composite tubular struts used in applications like aerospace often require over-sizing to handle compression loads, leading to increased cost and weight, as their compressive strength is generally lower than tensile strength.
Innovation Solution
A composite columnar structure with a sleeve-like reinforcement around a laminated core, which includes a metal, precured fiber reinforced composite, or ceramic sleeve, enhancing compressive strength while maintaining a lightweight design by controlling wrinkling during consolidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If composite tubular struts are over-sized to handle compression loads, then compressive strength is improved, but weight and cost increase
Solution Approach 1:
The patent applies composite materials by combining a fiber-reinforced resin laminate core with a metal reinforcement layer (titanium, aluminum, or steel). This hybrid composite structure leverages the high specific strength of composites for tensile loads while the metal layer provides enhanced compressive strength, resolving the contradiction between compressive strength and weight by creating a material system that excels in both compression and tension without requiring overall size increase
Solution Approach 2:
The reinforcement layer is applied locally only where compressive strength enhancement is needed - specifically as an intermediate layer between the laminate core and the outer skin. This localized application of metal reinforcement provides compressive load-bearing capacity exactly where required, while maintaining the lightweight composite structure in regions where it suffices, thus improving compressive strength without proportionally increasing overall weight
2Strength
If composite tubular struts are over-sized to handle compression loads, then compressive strength is improved, but cost increases
Solution Approach 1:
The hybrid composite construction allows optimization of material usage - employing cost-effective resin laminates for the core structure and applying expensive metal reinforcement only as a thin intermediate layer where structurally necessary. This composite approach achieves required compressive strength without the prohibitive cost of entirely metal or oversized composite construction
Solution Approach 2:
The reinforcement layer is applied locally only where compressive strength enhancement is needed - specifically as an intermediate layer between the laminate core and the outer skin. This localized application of metal reinforcement provides compressive load-bearing capacity exactly where required, while maintaining the lightweight composite structure in regions where it suffices, thus improving compressive strength without proportionally increasing overall weight
3Strength
If a reinforcement layer is added to enhance compressive strength, then compression load capability is improved, but structural complexity increases
Solution Approach 1:
The reinforcement layer serves multiple functions simultaneously: it enhances compressive strength, acts as a bonding interface between the laminate core and outer skin, and provides a substrate for outer skin attachment. By merging these functions into a single intermediate layer, the design achieves enhanced compression capability without proportionally increasing structural complexity
Solution Approach 2:
The metal reinforcement layer performs multiple roles: structural reinforcement for compression, bonding substrate for the outer skin, and potential attachment surface for fittings. This multi-functionality means that adding the reinforcement layer does not simply add one function but delivers several benefits simultaneously, offsetting the increase in structural complexity with increased functional efficiency
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 structure effectively resists axial compression loads without significant weight addition, allowing for 'right-sizing' to meet both compression and tension load specifications, thereby reducing costs and weight.
Implementation Method 1
the reinforcement may include corrugations on the inside wall thereof which may control wrinkling of underlying laminate plies of the laminate core during consolidation and curing of the laminate core
Implementation Method 2
The reinforcement allows composite tubular struts and similar columnar structures to be designed that are 'right-sized' to meet both compression and tension load carrying specifications
Data Source
AI summary
A columnar structure comprises a generally hollow laminate core, an outer composite skin, and a sleeve-like reinforcement. The sleeve-like reinforcement surrounds the laminate core and is sandwiched between the laminate core and the outer composite skin for reacting compressive loads imposed on the columnar structure.