Ultrasonic guided wave inspection of a titanium repair patch bonded to an aluminum aircraft skin

Padmakumar Puthillath, Joseph L. Rose

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Adhesively bonded aircraft repair patches provide stiffness improvement and life extension to aging aircraft. Repair patches are mainly metal or composite plate like structures bonded onto the aircraft skin after adequate surface preparations. Any damage to the bonding in an adhesive repair patch, like adhesive and cohesive weaknesses similar to that found in adhesively bonded joints, can result in less than expected life extension of the aircraft. A conventional inspection approach using normal or oblique incidence of ultrasonic waves has only limited capability in detecting adhesive and cohesive weaknesses. An ultrasonic guided wave based inspection method is developed and presented. Theoretical work using wave structures is done to select guided wave modes with large in-plane displacement at the aluminum skin and adhesive epoxy interface. Aluminum plate with epoxy bonded titanium repair patches were fabricated in the laboratory with simulated interfacial and bulk weaknesses representing a small representative class of the defects possible in a bonded joint. Defect sensitive guided wave modes were selected and implemented successfully in an angle beam wedge based inspection set-up. This was further successfully extended to a linear scan, termed as a G (*) scan, which has defect sizing ability also.

Original languageEnglish (US)
Pages (from-to)566-573
Number of pages8
JournalInternational Journal of Adhesion and Adhesives
Volume30
Issue number7
DOIs
StatePublished - Oct 1 2010

Fingerprint

Guided electromagnetic wave propagation
Ultrasonic waves
Titanium
Aluminum
Adhesives
Skin
Repair
Inspection
Aircraft
Defects
Plant life extension
Aging of materials
Metals
Stiffness
Composite materials

All Science Journal Classification (ASJC) codes

  • Biomaterials
  • Chemical Engineering(all)
  • Polymers and Plastics

Cite this

@article{e673a89aac084b3cafc8ba3271c13035,
title = "Ultrasonic guided wave inspection of a titanium repair patch bonded to an aluminum aircraft skin",
abstract = "Adhesively bonded aircraft repair patches provide stiffness improvement and life extension to aging aircraft. Repair patches are mainly metal or composite plate like structures bonded onto the aircraft skin after adequate surface preparations. Any damage to the bonding in an adhesive repair patch, like adhesive and cohesive weaknesses similar to that found in adhesively bonded joints, can result in less than expected life extension of the aircraft. A conventional inspection approach using normal or oblique incidence of ultrasonic waves has only limited capability in detecting adhesive and cohesive weaknesses. An ultrasonic guided wave based inspection method is developed and presented. Theoretical work using wave structures is done to select guided wave modes with large in-plane displacement at the aluminum skin and adhesive epoxy interface. Aluminum plate with epoxy bonded titanium repair patches were fabricated in the laboratory with simulated interfacial and bulk weaknesses representing a small representative class of the defects possible in a bonded joint. Defect sensitive guided wave modes were selected and implemented successfully in an angle beam wedge based inspection set-up. This was further successfully extended to a linear scan, termed as a G (*) scan, which has defect sizing ability also.",
author = "Padmakumar Puthillath and Rose, {Joseph L.}",
year = "2010",
month = "10",
day = "1",
doi = "10.1016/j.ijadhadh.2010.05.008",
language = "English (US)",
volume = "30",
pages = "566--573",
journal = "International Journal of Adhesion and Adhesives",
issn = "0143-7496",
publisher = "Elsevier Limited",
number = "7",

}

Ultrasonic guided wave inspection of a titanium repair patch bonded to an aluminum aircraft skin. / Puthillath, Padmakumar; Rose, Joseph L.

In: International Journal of Adhesion and Adhesives, Vol. 30, No. 7, 01.10.2010, p. 566-573.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ultrasonic guided wave inspection of a titanium repair patch bonded to an aluminum aircraft skin

AU - Puthillath, Padmakumar

AU - Rose, Joseph L.

PY - 2010/10/1

Y1 - 2010/10/1

N2 - Adhesively bonded aircraft repair patches provide stiffness improvement and life extension to aging aircraft. Repair patches are mainly metal or composite plate like structures bonded onto the aircraft skin after adequate surface preparations. Any damage to the bonding in an adhesive repair patch, like adhesive and cohesive weaknesses similar to that found in adhesively bonded joints, can result in less than expected life extension of the aircraft. A conventional inspection approach using normal or oblique incidence of ultrasonic waves has only limited capability in detecting adhesive and cohesive weaknesses. An ultrasonic guided wave based inspection method is developed and presented. Theoretical work using wave structures is done to select guided wave modes with large in-plane displacement at the aluminum skin and adhesive epoxy interface. Aluminum plate with epoxy bonded titanium repair patches were fabricated in the laboratory with simulated interfacial and bulk weaknesses representing a small representative class of the defects possible in a bonded joint. Defect sensitive guided wave modes were selected and implemented successfully in an angle beam wedge based inspection set-up. This was further successfully extended to a linear scan, termed as a G (*) scan, which has defect sizing ability also.

AB - Adhesively bonded aircraft repair patches provide stiffness improvement and life extension to aging aircraft. Repair patches are mainly metal or composite plate like structures bonded onto the aircraft skin after adequate surface preparations. Any damage to the bonding in an adhesive repair patch, like adhesive and cohesive weaknesses similar to that found in adhesively bonded joints, can result in less than expected life extension of the aircraft. A conventional inspection approach using normal or oblique incidence of ultrasonic waves has only limited capability in detecting adhesive and cohesive weaknesses. An ultrasonic guided wave based inspection method is developed and presented. Theoretical work using wave structures is done to select guided wave modes with large in-plane displacement at the aluminum skin and adhesive epoxy interface. Aluminum plate with epoxy bonded titanium repair patches were fabricated in the laboratory with simulated interfacial and bulk weaknesses representing a small representative class of the defects possible in a bonded joint. Defect sensitive guided wave modes were selected and implemented successfully in an angle beam wedge based inspection set-up. This was further successfully extended to a linear scan, termed as a G (*) scan, which has defect sizing ability also.

UR - http://www.scopus.com/inward/record.url?scp=77955513882&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77955513882&partnerID=8YFLogxK

U2 - 10.1016/j.ijadhadh.2010.05.008

DO - 10.1016/j.ijadhadh.2010.05.008

M3 - Article

AN - SCOPUS:77955513882

VL - 30

SP - 566

EP - 573

JO - International Journal of Adhesion and Adhesives

JF - International Journal of Adhesion and Adhesives

SN - 0143-7496

IS - 7

ER -