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Publication Detail
MONITORING FATIGUE CRACK GROWTH IN MULTI-LAYERED TENSILE SPECIMENS USING GUIDED ULTRASONIC WAVES
  • Publication Type:
    Conference
  • Authors:
    Kostson E, Fromme P
  • Publisher:
    AMER INST PHYSICS
  • Publication date:
    2010
  • Pagination:
    1425, 1432
  • Published proceedings:
    REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B
  • Volume:
    1211
  • Editors:
    Thompson DO,Chimenti DE
  • ISBN-13:
    978-0-7354-0748-0
  • Name of conference:
    36th Annual Review of Progress in Quantitative Nondestructive Evaluation
  • Conference place:
    Univ Rhode Isl, Kingston, RI
  • Conference start date:
    26/07/2009
  • Conference finish date:
    31/07/2009
  • Print ISSN:
    0094-243X
  • Language:
    EN
  • Keywords:
    Guided Ultrasonic Waves, Fatigue Crack Monitoring, Multi-layered Structure
  • Addresses:
    Kostson, E
    UCL
    Dept Mech Engn
    London
    WC1E 7JE
    England
Abstract
This contribution presents a study for the monitoring of fatigue crack growth at fastener holes in multi-layered aircraft structures using low frequency guided ultrasonic waves. The investigated model multi-layered structure consists of two adhesively bonded aluminum alloy tensile specimens. Guided ultrasonic waves were excited using multiple piezoelectric discs bonded to the surface of the multi-layered structure. The wave propagation in the tensile specimen was measured using a laser interferometer and compared to numerical simulations. Experiments and 3D Finite Element (FE) simulations show a change in the scattered field around fastener holes caused by a defect in the 2(nd) layer. During fatigue crack growth, changes in the amplitude of the ultrasonic signal at a single point were monitored and correlated to the optically measured crack length.
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