Method for determining a deformation of an area of a part obtained by additive manufacturing

Patent metadata

Field	Value
Publication number	US-12487071-B2
Application number	US-202218574283-A
Country	US
Kind code	B2
Filing date	Jul 5, 2022
Priority date	Jul 6, 2021
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

The method is for the discriminant monitoring of a composite multi-material assembly ( 1 ) having at least one internal layer ( 10 ) made of a first, electrically conductive composite material and a second layer ( 11 ) made of a second, electrically insulating composite material, the second layer ( 11 ) covering the first internal layer ( 10 ). The method includes: —preparing the composite multi-material assembly ( 1 ) by exposing a portion ( 101 ) of the internal layer ( 10 ), which constitutes a first electrode; —applying a second electrode ( 103 ) to the surface of the second layer ( 11 ), one of these electrodes ( 103 ) being earthed; —performing discriminant monitoring wherein a current is generated between the first electrode ( 101 ) and the second electrode ( 103 ) by applying a threshold voltage Us predetermined by calibration to characterize a lack of structural defects, the appearance of a breakdown at a voltage lower than the threshold voltage Us being indicative of the presence of at least one structural defect in the composite assembly ( 1 ).

First claim

The invention claimed is:

1 . A method for determination of a deformation of a predetermined zone of a part obtained by additive manufacturing, the deformation being generated by stress in the part, wherein the method includes:
before stress is applied to the part, positioning a magnetostrictive test piece in a zone representative of the deformation, and determining the deformation using a sensor configured to measure the magnetic permeability of the magnetostrictive test piece, the deformation being determined as a function of a variation of a magnetic permeability of the magnetostrictive test piece between before and after stress is applied to the part, the sensor including a magnet associated with a coil including a ferrite core, the coil and the magnet being associated with a capacitor connected in parallel with the coil.

2 . The method as claimed in claim 1 , wherein the deformation is determined as a function of a variation of an inductance of the coil between before and after stress is applied, the determining of the deformation including measuring the inductance of the coil before stress is applied to the part and measuring the inductance of the coil after stress is applied to the part.

3 . The method as claimed in claim 2 , wherein the magnetostrictive test piece is placed in the zone representative of the deformation and in contact with the predetermined zone or in proximity of the predetermined zone.

4 . The method as claimed in claim 3 , further including, before the positioning the magnetostrictive test piece, determining by simulation of the zone representative of the deformation.

5 . The method as claimed in claim 2 , further including, before the positioning the magnetostrictive test piece, determining by simulation of the zone representative of the deformation.

6 . The method as claimed in claim 2 , wherein the zone representative of the deformation is an edge zone of the deformed predetermined zone.

7 . The method as claimed in claim 2 , wherein
before stress is applied to the part, the positioning a magnetostrictive test piece in the zone representative of the deformation takes place during a process of manufacture of the part, and the method further includes adjusting manufacturing parameters of the part for clean integration of the magnetostrictive test piece into the part.

8 . The method as claimed in claim 1 , wherein the magnetostrictive test piece is placed in the zone representative of the deformation and in contact with a predetermined zone or in proximity of the predetermined zone.

9 . The method as claimed in claim 8 , further including, before the positioning the magnetostrictive test piece, determining by simulation of the zone representative of the deformation.

10 . The method as claimed in claim 8 , wherein the zone representative of the deformation is an edge zone of the deformed predetermined zone.

11 . The method as claimed in claim 8 , wherein
before stress is applied to the part, the positioning a magnetostrictive test piece in the zone representative of the deformation takes place during a process of manufacture of the part, and the method further includes adjusting manufacturing parameters of the part for clean integration of the magnetostrictive test piece into the part.

12 . The method as claimed in claim 1 , further including, before the positioning the magnetostrictive test piece, determining by simulation of the zone representative of the deformation.

13 . The method as claimed in claim 12 , wherein the zone representative of the deformation is an edge zone of the deformed predetermined zone.

14 . The method as claimed in claim 12 , wherein
before stress is applied to the part, the positioning a magnetostrictive test piece in the zone representative of the deformation takes place during a process of manufacture of the part, and the method further includes adjusting manufacturing parameters of the part for clean integration of the magnetostrictive test piece into the part.

15 . The method as claimed in claim 1 , wherein the zone representative of the deformation is an edge zone of the deformed predetermined zone.

16 . The method as claimed in claim 1 , wherein
before stress is applied to the part, the positioning a magnetostrictive test piece in the zone representative of the deformation takes place during a process of manufacture of the part, and the method further includes adjusting manufacturing parameters of the part for clean integration of the magnetostrictive test piece into the part.

17 . The method as claimed in claim 1 , wherein the part is obtained by metal wire arc additive manufacturing.

18 . The method as claimed in claim 1 , wherein the part is an amagnetic material part.

19 . The method as claimed in claim 18 , wherein the part includes an amagnetic metal chosen from the group consisting of aluminum and titanium.

20 . The method as claimed in claim 1 , wherein the magnetostrictive test piece contains a material selected from the group consisting of steel, an iron-gallium alloy, an alloy of terbium, dysprosium and iron, and an alloy of iron, nickel and cobalt.

Assignees

• Univ Grenoble Alpes
• Inst Polytechnique Grenoble
• Centre Nat Rech Scient

Inventors

• Ricart Thibault
• Basrour Skandar
• Museau Matthieu
• Robert Pascal
• Béraud Nicolas
• Paris Henri

Classifications

• B33Y40/00

  Auxiliary operations or equipment, e.g. for material handling · CPC title

• G01B7/24 Primary

  using change in magnetic properties · CPC title

• G01N2203/0635

  using magnetic properties · CPC title

• G01L5/0047 Primary

  measuring forces due to residual stresses · CPC title