Method for manufacturing a rotationally symmetrical composite part with locally optimized properties and resulting rotationally symmetrical part

By applying unidirectional fibrous layers and high-elongation reinforcing belts, the method enhances debris retention and structural integrity of composite turbine casings, addressing resonance issues and maintaining mechanical properties.

WO2026125842A1PCT designated stage Publication Date: 2026-06-18SAFRAN SA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SAFRAN SA
Filing Date
2025-12-04
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Gas turbine casings made of composite material face issues with structural zones outside the retention zone being thinner, leading to sensitivity to vibrational stresses and potential frequency crossover, which can cause casing failure due to resonance with blade wake excitation frequencies.

⚗Method used

A method involving the deposition of unidirectional fibrous layers and a reinforcing belt with high-elongation fibers on the structural ferrule to enhance retention capacity locally without affecting overall structural properties, using techniques like Automatic Fiber Placement (AFP) and resin transfer molding (RTM) for densification.

🎯Benefits of technology

The method effectively increases the debris retention capacity of composite material casings while maintaining structural integrity, preventing resonance and casing failure by locally reinforcing vulnerable areas.

✦ Generated by Eureka AI based on patent content.

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  • Figure FR2025051131_18062026_PF_FP_ABST
    Figure FR2025051131_18062026_PF_FP_ABST
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Abstract

The invention relates to a method for manufacturing a rotationally symmetrical composite part, the method comprising: - depositing a plurality of unidirectional fiber layers on a mandrel (200) in order to obtain a structural shroud fiber preform (100); - winding a textile strip (90) over one or more turns on the outer surface (100b) of the fiber preform (100) in order to obtain a reinforcing belt fiber preform, the textile strip (90) being formed with fibers that have an elongation at break greater than or equal to 1.6%; - densifying the structural shroud fiber preform and the belt fiber preform with a matrix so as to obtain a rotationally symmetrical composite part comprising a structural shroud consisting of a fiber reinforcement that corresponds to the structural shroud fiber preform (100) densified by the matrix and a composite reinforcing belt present on an outer surface of the structural shroud.
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