Composite Strut Reinforcement for Compression Load Management
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Solution Overview
Problem
Composite tubular struts used in applications like aerospace often require over-sizing to handle compression loads effectively, leading to increased cost and weight, as their compressive strength is generally lower than tensile strength.
Innovation Solution
Incorporating a sleeve-like reinforcement around a laminated core of the strut, which can be made of materials like titanium or ceramic, to enhance compressive strength while maintaining a lightweight design, and using corrugations to control wrinkling during consolidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strut is over-sized to carry compression loads, then the compressive strength is improved, but the weight and cost increase
Solution Approach 1:
The invention uses a hybrid composite structure combining fiber-reinforced resin laminates with a metal tubular reinforcement (titanium, aluminum, or stainless steel). The metal reinforcement provides superior compressive strength while the composite laminate maintains tensile strength, creating a composite structure that meets both compression and tension load requirements without excessive weight
Solution Approach 2:
The metal tubular reinforcement is nested within the fiber-reinforced resin laminate core, with the reinforcement positioned centrally along the longitudinal axis. This nested configuration allows the stronger metal material to bear compression loads internally while the outer composite laminate provides tensile strength and structural integrity
2Strength
If the strut is over-sized to carry compression loads, then the compressive strength is improved, but the cost increases
Solution Approach 1:
The hybrid composite construction allows optimization of material usage by placing high-strength metal reinforcement only where compression loads are most critical (within the laminate core), rather than using expensive metal throughout the entire strut structure, thus reducing overall material cost while maintaining required strength
Solution Approach 2:
The metal reinforcement is positioned locally within the laminate core at specific locations along the strut length where compression loads are highest, rather than uniformly distributing material throughout. This localized reinforcement strategy reduces material costs while maintaining adequate compressive strength
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A columnar structure comprises a generally hollow laminate core (34), an outer composite skin (42), and a sleeve-like reinforcement (36). The reinforcement (36) of metal or ceramic for example surrounds the laminate core (34) and is sandwiched between the core and the out¬ er skin (42) for reacting compressive loads imposed on the columnar structure.