Methods of bonding two aeronautical parts and of analysing a bonding between two aeronautical parts

Patent metadata

Field	Value
Publication number	US-11435279-B1
Application number	US-202117307560-A
Country	US
Kind code	B1
Filing date	May 4, 2021
Priority date	May 4, 2021
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A method for analysing a bonding between two aeronautical parts. The method includes the steps of a) applying a release agent to a first surface to be bonded of a first part and to a second surface to be bonded of a second part, b) applying an adhesive to at least one of the first and second surfaces and positioning these surfaces on top of each other, the adhesive forming an adhesive film after polymerisation, c) separating the parts from each other and removing the adhesive film in one piece, d) analysing the adhesive film. The invention also relates to a method for bonding two aeronautical parts.

First claim

The invention claimed is:

1. A method for analysing a bonding between two aeronautical parts, wherein the method comprises the steps of:
i) applying a first pore-sealing agent to a first surface to be bonded of a first part and a second pore-sealing agent to a second surface to be bonded of a second part,
a) applying a first release agent to said first pore-sealing agent and a second release agent to said second pore-sealing agent,
b) applying an adhesive to at least one of the first and second release agents and positioning the first and second parts on top of each other so that the adhesive is located between the first and the second release agents, the adhesive forming an adhesive film after polymerisation,
c) separating the parts from each other and removing the adhesive film in one piece,
d) analysing the adhesive film.

2. The method according to claim 1 , wherein the step d) is carried out by analysing at least one image obtained by transparency of the adhesive film to light.

3. The method according to claim 2 , wherein the analysis of the image comprises the comparison and the interpretation of the differences in colour or contrast.

4. The method according to claim 3 , wherein the analysis of the image comprises the evaluation of the thickness of the adhesive film in one or more areas of the image.

5. The method according to claim 3 , wherein the analysis of the image comprises the evaluation of the porosity rate of the adhesive film.

6. The method according to claim 1 , wherein the first part is metallic.

7. The method according to claim 1 , wherein the second part is made of composite material.

8. The method according to claim 1 , wherein the second part is a vane or a blade and the first part is a shield for reinforcing a leading edge of said vane or blade.

9. A method for bonding two aeronautical parts, wherein said method comprises the steps of the method according to claim 1 , followed by the steps of:
e) applying an adhesive to at least one of the first and second surfaces and positioning these surfaces on top of each other, the adhesive forming an adhesive film after polymerisation.

10. The method according to claim 1 , wherein said method comprises, between the steps d) and e), a step of cleaning and/or preparing said first and second surfaces.

11. The method according to claim 7 , wherein the second part comprises carbon fibres embedded in a polymeric matrix.

12. The method according to claim 1 , wherein said first pore-sealing agent seals pores of said first surface, and said second pore-sealing agent seals pores of said second surface.

13. The method according to claim 7 , wherein said first release agent covers said first pore-sealing agent, and said second release agent covers said second pore-sealing agent.

Assignees

• Safran
• Safran Aircraft Engines

Inventors

• Bossan Pierre-Antoine
• Chauvin Thierry Patrick
• Chin Lauren
• Lapenta Cali
• Gallois Philippe

Classifications

• B29L2031/3076

  Aircrafts (blades, propellers B29L2031/08) · CPC title

• B29L2031/082

  Blades, e.g. for helicopters · CPC title

• B29C66/301

  Three-dimensional joints, i.e. the joined area being substantially non-flat (B29C66/5223, B29C66/5224, B29C66/5225 take precedence) · CPC title

• B29C66/54

  Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles · CPC title

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title