Fiber Composite Sleeve Connecting Element for Truss Structures
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Solution Overview
Problem
Existing connecting elements for truss structures, particularly in lightweight construction, introduce additional bending moments and weight due to the use of metal, limiting corrosion resistance and thermal expansion compatibility with fiber-reinforced plastics.
Innovation Solution
A connecting element in the form of a sleeve made of fiber composite material with a metallic force introduction component, featuring a raised section and flat portions, where the force introduction component is encased by a second layer of fiber composite material, minimizing metal usage and ensuring a stable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal connecting elements are used in truss structures, then connection strength and force introduction capability are improved, but weight increases and corrosion resistance deteriorates
Solution Approach 1:
The connecting element uses a composite structure combining metal force introduction component with fiber-reinforced plastic layers. The metal component (such as steel) provides high strength for force introduction, while the fiber-reinforced plastic layers provide corrosion resistance and reduce overall weight. This composite approach resolves the contradiction by allowing each material to contribute its advantageous properties in the appropriate functional zone.
Solution Approach 2:
The metal force introduction component is localized only where transverse forces need to be introduced, rather than using metal throughout the entire connecting element. The fiber-reinforced plastic material is used in regions where corrosion resistance and weight reduction are prioritized. This local differentiation of material quality allows the structure to achieve both strength where needed and weight/corrosion resistance where applicable.
2Strength
If metal connecting elements are used in truss structures, then connection strength is improved, but corrosion resistance deteriorates
Solution Approach 1:
The connecting element uses a composite structure combining metal force introduction component with fiber-reinforced plastic layers. The metal component (such as steel) provides high strength for force introduction, while the fiber-reinforced plastic layers provide corrosion resistance and reduce overall weight. This composite approach resolves the contradiction by allowing each material to contribute its advantageous properties in the appropriate functional zone.
Solution Approach 2:
The fiber-reinforced plastic layers act as an intermediary protective layer between the metal force introduction component and the corrosive environment. This intermediate layer shields the metal from direct exposure to moisture and chemicals, preventing corrosion while allowing the metal to maintain its strength-critical function.
3Strength
If metal connecting elements are used in truss structures, then force introduction capability is improved, but thermal expansion compatibility with fiber-reinforced plastics deteriorates
Solution Approach 1:
The metal force introduction component is localized only where transverse forces need to be introduced, rather than using metal throughout the entire connecting element. The fiber-reinforced plastic material is used in regions where corrosion resistance and weight reduction are prioritized. This local differentiation of material quality allows the structure to achieve both strength where needed and weight/corrosion resistance where applicable.
4Adaptability or versatility
If knots interrupting main chords are used for connection, then cross braces can be connected, but additional bending moments are introduced weakening the structure
Solution Approach 1:
The sleeve acts as an intermediary element that provides connection functionality without directly interrupting the main chord continuity. The sleeve accommodates the main chord while providing attachment points for cross braces, thereby enabling connectivity while preserving the structural integrity and force flow of the main chord.
Solution Approach 2:
The connecting element is segmented into distinct functional zones: a sleeve portion that interfaces with the main chord without interrupting it, and force introduction components that provide attachment points for cross braces. This segmentation allows the connection function to be separated from the main chord continuity, avoiding the introduction of bending moments.
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 solution provides a lightweight, stable structure that effectively introduces transverse forces without interrupting main chords, reducing weight and improving corrosion resistance while maintaining structural integrity.
Implementation Method 1
a second layer of fiber composite material which encases at least part of the force introduction component and the first layer of fiber composite material and thus connects the force introduction component to the first layer
Implementation Method 2
a second layer of fiber composite material which encases at least part of the force introduction component and the first layer of fiber composite material and thus connects the force introduction component to the first layer
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a connecting element 1 for introducing transverse forces, particularly in truss structures, in the form of a sleeve 1 that can be applied around an elongated element, with at least one preferably metallic force introduction component 2 arranged on the circumference of the sleeve, wherein the force introduction component 2 has a raised section 3 with at least one connection point 4 for connection with further elements and a flat section 5, 6, which adjoins the raised section in the longitudinal direction of the sleeve and/or circumferential direction of the sleeve, characterized in that the sleeve is essentially composed of a first layer 7 of fiber composite material and a second layer 8, 9 of fiber composite material, which together encases at least a part of the force introduction component 2 and the first layer of fiber composite material 7 and thus connects the force introduction component 2 with the first layer 7.