Composite materials enabling non-destructive testing

Patent metadata

Field	Value
Publication number	US-10789700-B2
Application number	US-201916288649-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Feb 28, 2018
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

The invention is related to composite materials that enable the detection of imperfections through non-destructive testing. The composite material may include several constituent materials. One of these constituent materials may include cavities of a predetermined or random shape that are arranged at predetermined or random locations. Another constituent material may at least partially fill at least some of these cavities during manufacturing of the composite material. A method for non-destructively detecting imperfections in such a composite material may involve receiving an image of the composite material that shows at least some cavities and detecting imperfections in the composite material based on an inspection of the image.

First claim

What is claimed is:

1. A composite material, comprising:
a first constituent material; and
a second constituent material for non-destructively detecting imperfections in the composite material,
wherein the second constituent material comprising an indicator grid and hollow elements that are threaded on the indicator grid and form a plurality of cavities; the first constituent material filling at least partially at least some cavities of the plurality of cavities of the second constituent material.

2. The composite material of claim 1 , wherein the composite material is produced using a technology selected from the group consisting of infusion technology, injection technology, and a hybrid technology that combines infusion and injection technology.

3. The composite material of claim 2 , wherein the first constituent material comprises a matrix material.

4. The composite material of claim 1 , further comprising:
a third constituent material that forms a sandwich layer with the second constituent material and is impregnated with the first constituent material.

5. The composite material of claim 1 , wherein an unfilled cavity of the plurality of cavities is indicative of a non-impregnated area of the third constituent material.

6. The composite material of claim 1 , wherein the second constituent material comprises foam.

7. The composite material of claim 4 , wherein a predetermined number of the plurality of cavities is arranged in a regular pattern at a surface area of the second constituent material, and wherein the surface area is in contact with the third constituent material.

8. The composite material of claim 1 , wherein at least some of the predetermined number of the plurality of cavities have an opening at the surface area of the second constituent material.

9. The composite material of claim 1 , wherein the second constituent material has an additional surface area that is opposite the surface area, and wherein at least some of the predetermined number of the plurality of cavities is at a predetermined distance from the additional surface area.

10. A method for non-destructively detecting imperfections in the composite material of claim 1 , comprising:
receiving an image of the composite material, wherein the image shows at least some cavities of the plurality of cavities in the second constituent material; and
detecting imperfections in the composite material based on an inspection of the image.

11. The method of claim 10 , wherein detecting imperfections in the composite material based on an inspection of the image further comprises:
evaluating, on the image, an inflation of the at least some cavities of the plurality of cavities with the first constituent material.

12. The method of claim 10 , wherein evaluating, on the image, an inflation of the plurality of cavities with the first constituent material further comprises:
determining whether at least a portion of the at least some cavities of the plurality of cavities shows an irregular pattern of inflation of the at least some cavities of the plurality of cavities with the first constituent material.

13. The method of claim 12 , wherein evaluating, on the image, an inflation of the plurality of cavities with the first constituent material further comprises:
in response to determining that the at least a portion of the at least some cavities of the plurality of cavities shows an irregular pattern of inflation with the first constituent material, determining that the composite material has an area that lacks impregnation with the first constituent material; and
determining that the composite material contains detectable imperfections.

14. The method of claim 12 , wherein evaluating, on the image, an inflation of the plurality of cavities with the first constituent material further comprises:
in response to determining that none of the at least a portion of the at least some cavities of the plurality of cavities shows an irregular pattern of inflation with the first constituent material, determining that the composite material has no area that lacks impregnation with the first constituent material; and
determining that the composite material is free of detectable imperfections.

Assignees

• Airbus Helicopters Deutschland GmbH

Inventors

• Kommer Christian
• Zellhuber Markus
• Meierling Philipp

Classifications

• B29C65/8292

  by the use of ultrasonic, sonic or infrasonic waves · CPC title

• B29C65/8253 Primary

  by the use of waves or particle radiation, e.g. visual examination, scanning electron microscopy, or X-rays (B29C65/8292 takes precedence) · CPC title

• B29C70/48

  and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM] {, e.g. by vacuum} · CPC title

• B32B2266/0278

  Polyurethane · CPC title

• G01N2223/615

  composite materials, multilayer laminates · CPC title