INTERNAL ATTACHMENT PIECE FOR HYBRID BLADE FOOT

The composite material structure with a specialized internal fastening piece addresses decohesion and cracking issues by accommodating thermal expansion, enhancing structural integrity and reducing mass in composite blades.

FR3167176A1Active Publication Date: 2026-04-10SAFRAN AIRCRAFT ENGINES SAS
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Patent Information

Application Number
FR2024010715
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-10-04
Publication Date
2026-04-10
Estimated Expiration
2044-10-04

AI Technical Summary

Technical Problem

Existing composite blades in propulsion systems face issues with decohesion and cracking due to differential thermal expansion between metal attachments and composite materials, leading to potential damage at the blade root interface.

Method used

A composite material structure with a fibrous reinforcement and a three-dimensional weaving design, incorporating a housing for an internal fastening piece with a specially shaped head to accommodate thermal expansion and prevent decohesion, using a metallic attachment that matches the composite material's expansion characteristics.

Benefits of technology

The solution effectively prevents decohesion and cracking by allowing for differential expansion, ensuring the composite blades maintain structural integrity under aerodynamic stresses while reducing mass and maintaining aerodynamic performance.

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Abstract

The present invention relates to a blade comprising: a composite material structure including a blade foot portion comprising a housing, an external attachment piece, and an internal attachment piece disposed inside the housing; wherein the internal attachment piece includes a head comprising a contour line, delimiting a base, and a top edge; the top edge extending between a first and a second intersection with the contour line, the first and second intersections dividing the contour line into a first and a second portion; the first portion delimiting, with the top edge, a first lateral surface and the second portion delimiting, with the top edge, a second lateral surface; and the first and second lateral surfaces each comprising a concave curvature zone. Figure for the abstract: Fig. 4b
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