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Apparatus for in-situ nondestructive measurement of young's modulus of plate structures

  • US 20030233876A1
  • Filed: 04/24/2003
  • Published: 12/25/2003
  • Est. Priority Date: 06/22/2000
  • Status: Active Grant
First Claim
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1. An apparatus for quantitatively evaluating a material stiffness of a composite laminate plate along an in-plane direction, the plate having a plurality of plies arranged in a balanced symmetric ply lay-up and having opposite major surfaces defining a thickness of the plate therebetween, the apparatus comprising:

  • a transducer for initiating an elastic extensional-mode wave that propagates through the plate along said in-plane direction;

    a sensor, spaced apart from said transducer by a distance d, for detecting arrival of the extensional-mode wave; and

    a processor, responsive to said transducer and said sensor, for calculating a material stiffness of the plate along said in-plane direction based on the distance d and an elapsed time between the initiation of the extensional-mode wave by said transducer and the arrival of the extensional-mode wave at said sensor.

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