Method for characterizing a part made of a woven composite material

Patent metadata

Field	Value
Publication number	US-9916651-B2
Application number	US-201414916869-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Sep 6, 2013
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A method of characterizing a part made of woven composite material, includes calculating autocorrelation values of a three-dimensional image in an observation window of the volume of the part for a plurality of spatial vectors used as the autocorrelation interval, and then detecting at least one local extremum in the autocorrelation value on a main orientation of the weaving in order to determine a mean in the observation window for the distance between neighboring parallel yarns.

First claim

The invention claimed is:

1. A method of characterizing a part made of woven composite material, the method comprising: acquiring a three-dimensional image of the part by using a tomography appliance, calculating autocorrelation values of the three-dimensional image in an observation window of the volume of the part for a plurality of spatial vectors used as an autocorrelation interval, and detecting at least one local extremum in the autocorrelation value on a main orientation of the weaving in order to determine a mean in the observation window for a distance between neighboring parallel yarns, wherein the woven composite material is made of a woven fiber reinforcement embedded in a matrix, wherein the method further comprises realigning the image of the part so as to align axes of the image with axes of the woven fiber reinforcement.

2. A characterization method according to claim 1 , wherein the autocorrelation values are calculated by using the Wiener-Khinchin theorem.

3. A characterization method according to claim 1 , further comprising detecting a main weaving orientation in the plurality of vectors.

4. A characterization method according to claim 1 , wherein at least one local extremum is detected for a weft yarn direction and for a warp yarn direction in order to determine means in the observation window respectively for the distances between neighboring weft yarns and between neighboring warp yarns.

5. A characterization method according to claim 1 , wherein the part is made of three-dimensionally woven composite material.

6. A characterization method according to claim 1 , wherein the part comprises carbon fibers in a carbon matrix.

7. A characterization method according to claim 1 , wherein the image is an X-ray tomography image.

8. A characterization method according to claim 1 , comprising measuring a distance between two consecutive maxima in the autocorrelation values to determine the distance between neighboring parallel yarns.

Assignees

• Safran

Inventors

• Morard Vincent
• Parra Estelle
• Tourais David

Classifications

• G01N23/046 Primary

  using tomography, e.g. computed tomography [CT] · CPC title

• G06T7/0004 Primary

  Industrial image inspection · CPC title

• G06T7/40

  Analysis of texture (depth or shape recovery from texture G06T7/529) · CPC title

• G06T2200/04

  involving 3D image data · CPC title

• G01N2223/615

  composite materials, multilayer laminates · CPC title