Interleaved Stiffener for Aircraft Engine Link Buckling
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Solution Overview
Problem
Existing aircraft engine attachment assemblies face challenges in resisting both traction and compression forces without increasing the overall thickness, which can lead to buckling under compression due to insufficient transverse inertia.
Innovation Solution
The introduction of an interleaved stiffener between the links, which includes a parallelepiped body with yokes and flanges that maintain contact with the links, enhancing transverse inertia without oversizing the thickness, and a connecting system to secure the links against the stiffener, thereby limiting transverse bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness E of each link is increased to limit buckling under compression forces, then the transverse inertia of each link is increased, but the total thickness H of the assembly at the level of each articulation element is significantly increased
Solution Approach 1:
The stiffener introduces a new dimensional element between the links, positioned in the transverse direction rather than increasing link thickness. This allows the assembly to gain transverse inertia through the spacing and positioning of the stiffener body rather than through thicker links, thereby resolving the contradiction between compression resistance and assembly thickness.
Solution Approach 2:
The stiffener acts as an intermediary element positioned between the first and second links. It provides mechanical support and limits transverse bending of the links under compression forces without requiring the links themselves to be thicker. The stiffener body with yokes and flanges serves as a mediating structure that distributes and resists compressive loads.
2Stability of the object's composition
If the transverse inertia of each link is increased to prevent buckling, then the link can withstand compression forces, but the overall assembly thickness is significantly increased
Solution Approach 1:
Instead of increasing transverse inertia by thickening links in one dimension, the stiffener introduces structural support in another dimension - the transverse spacing between links. The body of parallelepiped shape positioned between links creates rotational inertia and structural stability without increasing the thickness of individual link components.
Solution Approach 2:
The stiffener is segmented into distinct functional parts: a body of parallelepiped shape, first and second yokes connected to opposite parts, and flanges for attachment. This segmentation allows each component to contribute specifically to transverse inertia and stability while maintaining a compact overall thickness profile.
Data Source
AI summary
An assembly including a connecting device, connecting first and second parts, including first and second links positioned on respective opposite sides of the first and second parts and an interleaved stiffener, positioned between the first and second links, having a first contact face oriented toward the first link and a second contact face oriented toward the second link, parallel to the first face, the first and second contact faces being separated by a distance equal to that separating the first and second links. This interleaved stiffener makes it possible to limit the risks of bending of the links when they are loaded in compression.