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Publication Detail
DIRECTIONALITY OF THE SCATTERING OF THE A(0) LAMB WAVE MODE AT CRACKS
  • Publication Type:
    Conference
  • Authors:
    Fromme P
  • Publisher:
    AMER INST PHYSICS
  • Publication date:
    2010
  • Pagination:
    129, 136
  • 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, Structural Health Monitoring, Scattering, GUIDED-WAVES, PLATE
  • Addresses:
    UCL
    Dept Mech Engn
    London
    WC1E 7JE
    England
Abstract
Localized and distributed array systems for guided ultrasonic waves offer an efficient way for the long-term monitoring of the structural integrity of large structures. However, the detection sensitivity for fatigue cracks depends on the orientation of the crack relative to the position of the transducer elements. Finite Element (FE) simulations show that for cracks and slots no energy is scattered in certain directions from the defect. Crack-like defects have a directionality pattern of the scattered field depending on the angle of the incident wave relative to the crack orientation and on the ratio of the characteristic defect size and depth to wavelength. Simulation predictions are compared to laser measurements of the scattered wave field at machined part-through and through thickness notches. Good agreement is found and the directionality pattern can be predicted accurately. These results provide the basis for the quantification of the detection sensitivity for defects in plate structures using guided wave sensors and arrays.
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Dept of Mechanical Engineering
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